(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('react'), require('react-dom'), require('prop-types')) :
  typeof define === 'function' && define.amd ? define(['exports', 'react', 'react-dom', 'prop-types'], factory) :
  (global = global || self, factory(global.ReactFlow = {}, global.React, global.ReactDOM, global.PropTypes));
}(this, function (exports, React, reactDom, PropTypes) { 'use strict';

  var React__default = 'default' in React ? React['default'] : React;
  reactDom = reactDom && reactDom.hasOwnProperty('default') ? reactDom['default'] : reactDom;
  PropTypes = PropTypes && PropTypes.hasOwnProperty('default') ? PropTypes['default'] : PropTypes;

  var obj;
  var NOTHING = typeof Symbol !== "undefined" ? Symbol("immer-nothing") : ( obj = {}, obj["immer-nothing"] = true, obj );
  var DRAFTABLE = typeof Symbol !== "undefined" && Symbol.for ? Symbol.for("immer-draftable") : "__$immer_draftable";
  var DRAFT_STATE = typeof Symbol !== "undefined" && Symbol.for ? Symbol.for("immer-state") : "__$immer_state";
  function isDraft(value) {
    return !!value && !!value[DRAFT_STATE];
  }
  function isDraftable(value) {
    if (!value || typeof value !== "object") { return false; }
    if (Array.isArray(value)) { return true; }
    var proto = Object.getPrototypeOf(value);
    if (!proto || proto === Object.prototype) { return true; }
    return !!value[DRAFTABLE] || !!value.constructor[DRAFTABLE];
  }
  var assign = Object.assign || function assign(target, value) {
    for (var key in value) {
      if (has(value, key)) {
        target[key] = value[key];
      }
    }

    return target;
  };
  var ownKeys = typeof Reflect !== "undefined" && Reflect.ownKeys ? Reflect.ownKeys : typeof Object.getOwnPropertySymbols !== "undefined" ? function (obj) { return Object.getOwnPropertyNames(obj).concat(Object.getOwnPropertySymbols(obj)); } : Object.getOwnPropertyNames;
  function shallowCopy(base, invokeGetters) {
    if ( invokeGetters === void 0 ) invokeGetters = false;

    if (Array.isArray(base)) { return base.slice(); }
    var clone = Object.create(Object.getPrototypeOf(base));
    ownKeys(base).forEach(function (key) {
      if (key === DRAFT_STATE) {
        return; // Never copy over draft state.
      }

      var desc = Object.getOwnPropertyDescriptor(base, key);
      var value = desc.value;

      if (desc.get) {
        if (invokeGetters) {
          value = desc.get.call(base);
        }
      }

      if (desc.enumerable) {
        clone[key] = value;
      } else if (invokeGetters) {
        Object.defineProperty(clone, key, {
          value: value,
          writable: true,
          configurable: true
        });
      }
    });
    return clone;
  }
  function each(value, cb) {
    if (Array.isArray(value)) {
      for (var i = 0; i < value.length; i++) { cb(i, value[i], value); }
    } else {
      ownKeys(value).forEach(function (key) { return cb(key, value[key], value); });
    }
  }
  function isEnumerable(base, prop) {
    var desc = Object.getOwnPropertyDescriptor(base, prop);
    return !!desc && desc.enumerable;
  }
  function has(thing, prop) {
    return Object.prototype.hasOwnProperty.call(thing, prop);
  }
  function is(x, y) {
    // From: https://github.com/facebook/fbjs/blob/c69904a511b900266935168223063dd8772dfc40/packages/fbjs/src/core/shallowEqual.js
    if (x === y) {
      return x !== 0 || 1 / x === 1 / y;
    } else {
      return x !== x && y !== y;
    }
  }

  /** Each scope represents a `produce` call. */

  var ImmerScope = function ImmerScope(parent) {
    this.drafts = [];
    this.parent = parent; // Whenever the modified draft contains a draft from another scope, we
    // need to prevent auto-freezing so the unowned draft can be finalized.

    this.canAutoFreeze = true; // To avoid prototype lookups:

    this.patches = null;
  };

  ImmerScope.prototype.usePatches = function usePatches (patchListener) {
    if (patchListener) {
      this.patches = [];
      this.inversePatches = [];
      this.patchListener = patchListener;
    }
  };

  ImmerScope.prototype.revoke = function revoke$1 () {
    this.leave();
    this.drafts.forEach(revoke);
    this.drafts = null; // Make draft-related methods throw.
  };

  ImmerScope.prototype.leave = function leave () {
    if (this === ImmerScope.current) {
      ImmerScope.current = this.parent;
    }
  };
  ImmerScope.current = null;

  ImmerScope.enter = function () {
    return this.current = new ImmerScope(this.current);
  };

  function revoke(draft) {
    draft[DRAFT_STATE].revoke();
  }

  // but share them all instead

  var descriptors = {};
  function willFinalize(scope, result, isReplaced) {
    scope.drafts.forEach(function (draft) {
      draft[DRAFT_STATE].finalizing = true;
    });

    if (!isReplaced) {
      if (scope.patches) {
        markChangesRecursively(scope.drafts[0]);
      } // This is faster when we don't care about which attributes changed.


      markChangesSweep(scope.drafts);
    } // When a child draft is returned, look for changes.
    else if (isDraft(result) && result[DRAFT_STATE].scope === scope) {
        markChangesSweep(scope.drafts);
      }
  }
  function createProxy(base, parent) {
    var isArray = Array.isArray(base);
    var draft = clonePotentialDraft(base);
    each(draft, function (prop) {
      proxyProperty(draft, prop, isArray || isEnumerable(base, prop));
    }); // See "proxy.js" for property documentation.

    var scope = parent ? parent.scope : ImmerScope.current;
    var state = {
      scope: scope,
      modified: false,
      finalizing: false,
      // es5 only
      finalized: false,
      assigned: {},
      parent: parent,
      base: base,
      draft: draft,
      copy: null,
      revoke: revoke$1,
      revoked: false // es5 only

    };
    createHiddenProperty(draft, DRAFT_STATE, state);
    scope.drafts.push(draft);
    return draft;
  }

  function revoke$1() {
    this.revoked = true;
  }

  function source(state) {
    return state.copy || state.base;
  } // Access a property without creating an Immer draft.


  function peek(draft, prop) {
    var state = draft[DRAFT_STATE];

    if (state && !state.finalizing) {
      state.finalizing = true;
      var value = draft[prop];
      state.finalizing = false;
      return value;
    }

    return draft[prop];
  }

  function get(state, prop) {
    assertUnrevoked(state);
    var value = peek(source(state), prop);
    if (state.finalizing) { return value; } // Create a draft if the value is unmodified.

    if (value === peek(state.base, prop) && isDraftable(value)) {
      prepareCopy(state);
      return state.copy[prop] = createProxy(value, state);
    }

    return value;
  }

  function set(state, prop, value) {
    assertUnrevoked(state);
    state.assigned[prop] = true;

    if (!state.modified) {
      if (is(value, peek(source(state), prop))) { return; }
      markChanged(state);
      prepareCopy(state);
    }

    state.copy[prop] = value;
  }

  function markChanged(state) {
    if (!state.modified) {
      state.modified = true;
      if (state.parent) { markChanged(state.parent); }
    }
  }

  function prepareCopy(state) {
    if (!state.copy) { state.copy = clonePotentialDraft(state.base); }
  }

  function clonePotentialDraft(base) {
    var state = base && base[DRAFT_STATE];

    if (state) {
      state.finalizing = true;
      var draft = shallowCopy(state.draft, true);
      state.finalizing = false;
      return draft;
    }

    return shallowCopy(base);
  }

  function proxyProperty(draft, prop, enumerable) {
    var desc = descriptors[prop];

    if (desc) {
      desc.enumerable = enumerable;
    } else {
      descriptors[prop] = desc = {
        configurable: true,
        enumerable: enumerable,

        get: function get$1() {
          return get(this[DRAFT_STATE], prop);
        },

        set: function set$1(value) {
          set(this[DRAFT_STATE], prop, value);
        }

      };
    }

    Object.defineProperty(draft, prop, desc);
  }

  function assertUnrevoked(state) {
    if (state.revoked === true) { throw new Error("Cannot use a proxy that has been revoked. Did you pass an object from inside an immer function to an async process? " + JSON.stringify(source(state))); }
  } // This looks expensive, but only proxies are visited, and only objects without known changes are scanned.


  function markChangesSweep(drafts) {
    // The natural order of drafts in the `scope` array is based on when they
    // were accessed. By processing drafts in reverse natural order, we have a
    // better chance of processing leaf nodes first. When a leaf node is known to
    // have changed, we can avoid any traversal of its ancestor nodes.
    for (var i = drafts.length - 1; i >= 0; i--) {
      var state = drafts[i][DRAFT_STATE];

      if (!state.modified) {
        if (Array.isArray(state.base)) {
          if (hasArrayChanges(state)) { markChanged(state); }
        } else if (hasObjectChanges(state)) { markChanged(state); }
      }
    }
  }

  function markChangesRecursively(object) {
    if (!object || typeof object !== "object") { return; }
    var state = object[DRAFT_STATE];
    if (!state) { return; }
    var base = state.base;
    var draft = state.draft;
    var assigned = state.assigned;

    if (!Array.isArray(object)) {
      // Look for added keys.
      Object.keys(draft).forEach(function (key) {
        // The `undefined` check is a fast path for pre-existing keys.
        if (base[key] === undefined && !has(base, key)) {
          assigned[key] = true;
          markChanged(state);
        } else if (!assigned[key]) {
          // Only untouched properties trigger recursion.
          markChangesRecursively(draft[key]);
        }
      }); // Look for removed keys.

      Object.keys(base).forEach(function (key) {
        // The `undefined` check is a fast path for pre-existing keys.
        if (draft[key] === undefined && !has(draft, key)) {
          assigned[key] = false;
          markChanged(state);
        }
      });
    } else if (hasArrayChanges(state)) {
      markChanged(state);
      assigned.length = true;

      if (draft.length < base.length) {
        for (var i = draft.length; i < base.length; i++) { assigned[i] = false; }
      } else {
        for (var i$1 = base.length; i$1 < draft.length; i$1++) { assigned[i$1] = true; }
      }

      for (var i$2 = 0; i$2 < draft.length; i$2++) {
        // Only untouched indices trigger recursion.
        if (assigned[i$2] === undefined) { markChangesRecursively(draft[i$2]); }
      }
    }
  }

  function hasObjectChanges(state) {
    var base = state.base;
    var draft = state.draft; // Search for added keys and changed keys. Start at the back, because
    // non-numeric keys are ordered by time of definition on the object.

    var keys = Object.keys(draft);

    for (var i = keys.length - 1; i >= 0; i--) {
      var key = keys[i];
      var baseValue = base[key]; // The `undefined` check is a fast path for pre-existing keys.

      if (baseValue === undefined && !has(base, key)) {
        return true;
      } // Once a base key is deleted, future changes go undetected, because its
      // descriptor is erased. This branch detects any missed changes.
      else {
          var value = draft[key];
          var state$1 = value && value[DRAFT_STATE];

          if (state$1 ? state$1.base !== baseValue : !is(value, baseValue)) {
            return true;
          }
        }
    } // At this point, no keys were added or changed.
    // Compare key count to determine if keys were deleted.


    return keys.length !== Object.keys(base).length;
  }

  function hasArrayChanges(state) {
    var draft = state.draft;
    if (draft.length !== state.base.length) { return true; } // See #116
    // If we first shorten the length, our array interceptors will be removed.
    // If after that new items are added, result in the same original length,
    // those last items will have no intercepting property.
    // So if there is no own descriptor on the last position, we know that items were removed and added
    // N.B.: splice, unshift, etc only shift values around, but not prop descriptors, so we only have to check
    // the last one

    var descriptor = Object.getOwnPropertyDescriptor(draft, draft.length - 1); // descriptor can be null, but only for newly created sparse arrays, eg. new Array(10)

    if (descriptor && !descriptor.get) { return true; } // For all other cases, we don't have to compare, as they would have been picked up by the index setters

    return false;
  }

  function createHiddenProperty(target, prop, value) {
    Object.defineProperty(target, prop, {
      value: value,
      enumerable: false,
      writable: true
    });
  }

  var legacyProxy = /*#__PURE__*/Object.freeze({
      willFinalize: willFinalize,
      createProxy: createProxy
  });

  function willFinalize$1() {}
  function createProxy$1(base, parent) {
    var scope = parent ? parent.scope : ImmerScope.current;
    var state = {
      // Track which produce call this is associated with.
      scope: scope,
      // True for both shallow and deep changes.
      modified: false,
      // Used during finalization.
      finalized: false,
      // Track which properties have been assigned (true) or deleted (false).
      assigned: {},
      // The parent draft state.
      parent: parent,
      // The base state.
      base: base,
      // The base proxy.
      draft: null,
      // Any property proxies.
      drafts: {},
      // The base copy with any updated values.
      copy: null,
      // Called by the `produce` function.
      revoke: null
    };
    var ref = Array.isArray(base) ? // [state] is used for arrays, to make sure the proxy is array-ish and not violate invariants,
    // although state itself is an object
    Proxy.revocable([state], arrayTraps) : Proxy.revocable(state, objectTraps);
    var revoke = ref.revoke;
    var proxy = ref.proxy;
    state.draft = proxy;
    state.revoke = revoke;
    scope.drafts.push(proxy);
    return proxy;
  }
  var objectTraps = {
    get: get$1,

    has: function has(target, prop) {
      return prop in source$1(target);
    },

    ownKeys: function ownKeys(target) {
      return Reflect.ownKeys(source$1(target));
    },

    set: set$1,
    deleteProperty: deleteProperty,
    getOwnPropertyDescriptor: getOwnPropertyDescriptor,

    defineProperty: function defineProperty() {
      throw new Error("Object.defineProperty() cannot be used on an Immer draft"); // prettier-ignore
    },

    getPrototypeOf: function getPrototypeOf(target) {
      return Object.getPrototypeOf(target.base);
    },

    setPrototypeOf: function setPrototypeOf() {
      throw new Error("Object.setPrototypeOf() cannot be used on an Immer draft"); // prettier-ignore
    }

  };
  var arrayTraps = {};
  each(objectTraps, function (key, fn) {
    arrayTraps[key] = function () {
      arguments[0] = arguments[0][0];
      return fn.apply(this, arguments);
    };
  });

  arrayTraps.deleteProperty = function (state, prop) {
    if (isNaN(parseInt(prop))) {
      throw new Error("Immer only supports deleting array indices"); // prettier-ignore
    }

    return objectTraps.deleteProperty.call(this, state[0], prop);
  };

  arrayTraps.set = function (state, prop, value) {
    if (prop !== "length" && isNaN(parseInt(prop))) {
      throw new Error("Immer only supports setting array indices and the 'length' property"); // prettier-ignore
    }

    return objectTraps.set.call(this, state[0], prop, value);
  }; // returns the object we should be reading the current value from, which is base, until some change has been made


  function source$1(state) {
    return state.copy || state.base;
  } // Access a property without creating an Immer draft.


  function peek$1(draft, prop) {
    var state = draft[DRAFT_STATE];
    var desc = Reflect.getOwnPropertyDescriptor(state ? source$1(state) : draft, prop);
    return desc && desc.value;
  }

  function get$1(state, prop) {
    if (prop === DRAFT_STATE) { return state; }
    var drafts = state.drafts; // Check for existing draft in unmodified state.

    if (!state.modified && has(drafts, prop)) {
      return drafts[prop];
    }

    var value = source$1(state)[prop];

    if (state.finalized || !isDraftable(value)) {
      return value;
    } // Check for existing draft in modified state.


    if (state.modified) {
      // Assigned values are never drafted. This catches any drafts we created, too.
      if (value !== peek$1(state.base, prop)) { return value; } // Store drafts on the copy (when one exists).

      drafts = state.copy;
    }

    return drafts[prop] = createProxy$1(value, state);
  }

  function set$1(state, prop, value) {
    if (!state.modified) {
      var baseValue = peek$1(state.base, prop); // Optimize based on value's truthiness. Truthy values are guaranteed to
      // never be undefined, so we can avoid the `in` operator. Lastly, truthy
      // values may be drafts, but falsy values are never drafts.

      var isUnchanged = value ? is(baseValue, value) || value === state.drafts[prop] : is(baseValue, value) && prop in state.base;
      if (isUnchanged) { return true; }
      markChanged$1(state);
    }

    state.assigned[prop] = true;
    state.copy[prop] = value;
    return true;
  }

  function deleteProperty(state, prop) {
    // The `undefined` check is a fast path for pre-existing keys.
    if (peek$1(state.base, prop) !== undefined || prop in state.base) {
      state.assigned[prop] = false;
      markChanged$1(state);
    }

    if (state.copy) { delete state.copy[prop]; }
    return true;
  } // Note: We never coerce `desc.value` into an Immer draft, because we can't make
  // the same guarantee in ES5 mode.


  function getOwnPropertyDescriptor(state, prop) {
    var owner = source$1(state);
    var desc = Reflect.getOwnPropertyDescriptor(owner, prop);

    if (desc) {
      desc.writable = true;
      desc.configurable = !Array.isArray(owner) || prop !== "length";
    }

    return desc;
  }

  function markChanged$1(state) {
    if (!state.modified) {
      state.modified = true;
      state.copy = assign(shallowCopy(state.base), state.drafts);
      state.drafts = null;
      if (state.parent) { markChanged$1(state.parent); }
    }
  }

  var modernProxy = /*#__PURE__*/Object.freeze({
      willFinalize: willFinalize$1,
      createProxy: createProxy$1
  });

  function generatePatches(state, basePath, patches, inversePatches) {
    Array.isArray(state.base) ? generateArrayPatches(state, basePath, patches, inversePatches) : generateObjectPatches(state, basePath, patches, inversePatches);
  }

  function generateArrayPatches(state, basePath, patches, inversePatches) {
    var assign, assign$1;

    var base = state.base;
    var copy = state.copy;
    var assigned = state.assigned; // Reduce complexity by ensuring `base` is never longer.

    if (copy.length < base.length) {
      (assign = [copy, base], base = assign[0], copy = assign[1]);
      (assign$1 = [inversePatches, patches], patches = assign$1[0], inversePatches = assign$1[1]);
    }

    var delta = copy.length - base.length; // Find the first replaced index.

    var start = 0;

    while (base[start] === copy[start] && start < base.length) {
      ++start;
    } // Find the last replaced index. Search from the end to optimize splice patches.


    var end = base.length;

    while (end > start && base[end - 1] === copy[end + delta - 1]) {
      --end;
    } // Process replaced indices.


    for (var i = start; i < end; ++i) {
      if (assigned[i] && copy[i] !== base[i]) {
        var path = basePath.concat([i]);
        patches.push({
          op: "replace",
          path: path,
          value: copy[i]
        });
        inversePatches.push({
          op: "replace",
          path: path,
          value: base[i]
        });
      }
    }

    var useRemove = end != base.length;
    var replaceCount = patches.length; // Process added indices.

    for (var i$1 = end + delta - 1; i$1 >= end; --i$1) {
      var path$1 = basePath.concat([i$1]);
      patches[replaceCount + i$1 - end] = {
        op: "add",
        path: path$1,
        value: copy[i$1]
      };

      if (useRemove) {
        inversePatches.push({
          op: "remove",
          path: path$1
        });
      }
    } // One "replace" patch reverses all non-splicing "add" patches.


    if (!useRemove) {
      inversePatches.push({
        op: "replace",
        path: basePath.concat(["length"]),
        value: base.length
      });
    }
  }

  function generateObjectPatches(state, basePath, patches, inversePatches) {
    var base = state.base;
    var copy = state.copy;
    each(state.assigned, function (key, assignedValue) {
      var origValue = base[key];
      var value = copy[key];
      var op = !assignedValue ? "remove" : key in base ? "replace" : "add";
      if (origValue === value && op === "replace") { return; }
      var path = basePath.concat(key);
      patches.push(op === "remove" ? {
        op: op,
        path: path
      } : {
        op: op,
        path: path,
        value: value
      });
      inversePatches.push(op === "add" ? {
        op: "remove",
        path: path
      } : op === "remove" ? {
        op: "add",
        path: path,
        value: origValue
      } : {
        op: "replace",
        path: path,
        value: origValue
      });
    });
  }

  function applyPatches(draft, patches) {
    for (var i = 0; i < patches.length; i++) {
      var patch = patches[i];
      var path = patch.path;

      if (path.length === 0 && patch.op === "replace") {
        draft = patch.value;
      } else {
        var base = draft;

        for (var i$1 = 0; i$1 < path.length - 1; i$1++) {
          base = base[path[i$1]];
          if (!base || typeof base !== "object") { throw new Error("Cannot apply patch, path doesn't resolve: " + path.join("/")); } // prettier-ignore
        }

        var key = path[path.length - 1];

        switch (patch.op) {
          case "replace":
            base[key] = patch.value;
            break;

          case "add":
            if (Array.isArray(base)) {
              // TODO: support "foo/-" paths for appending to an array
              base.splice(key, 0, patch.value);
            } else {
              base[key] = patch.value;
            }

            break;

          case "remove":
            if (Array.isArray(base)) {
              base.splice(key, 1);
            } else {
              delete base[key];
            }

            break;

          default:
            throw new Error("Unsupported patch operation: " + patch.op);
        }
      }
    }

    return draft;
  }

  function verifyMinified() {}

  var configDefaults = {
    useProxies: typeof Proxy !== "undefined" && typeof Reflect !== "undefined",
    autoFreeze: typeof process !== "undefined" ? process.env.NODE_ENV !== "production" : verifyMinified.name === "verifyMinified",
    onAssign: null,
    onDelete: null,
    onCopy: null
  };
  var Immer = function Immer(config) {
    assign(this, configDefaults, config);
    this.setUseProxies(this.useProxies);
    this.produce = this.produce.bind(this);
  };

  Immer.prototype.produce = function produce (base, recipe, patchListener) {
      var this$1 = this;

    // curried invocation
    if (typeof base === "function" && typeof recipe !== "function") {
      var defaultBase = recipe;
      recipe = base;
      var self = this;
      return function curriedProduce(base) {
          var this$1 = this;
          if ( base === void 0 ) base = defaultBase;
          var args = [], len = arguments.length - 1;
          while ( len-- > 0 ) args[ len ] = arguments[ len + 1 ];

        return self.produce(base, function (draft) { return recipe.call.apply(recipe, [ this$1, draft ].concat( args )); }); // prettier-ignore
      };
    } // prettier-ignore


    {
      if (typeof recipe !== "function") {
        throw new Error("The first or second argument to `produce` must be a function");
      }

      if (patchListener !== undefined && typeof patchListener !== "function") {
        throw new Error("The third argument to `produce` must be a function or undefined");
      }
    }
    var result; // Only plain objects, arrays, and "immerable classes" are drafted.

    if (isDraftable(base)) {
      var scope = ImmerScope.enter();
      var proxy = this.createProxy(base);
      var hasError = true;

      try {
        result = recipe(proxy);
        hasError = false;
      } finally {
        // finally instead of catch + rethrow better preserves original stack
        if (hasError) { scope.revoke(); }else { scope.leave(); }
      }

      if (result instanceof Promise) {
        return result.then(function (result) {
          scope.usePatches(patchListener);
          return this$1.processResult(result, scope);
        }, function (error) {
          scope.revoke();
          throw error;
        });
      }

      scope.usePatches(patchListener);
      return this.processResult(result, scope);
    } else {
      result = recipe(base);
      if (result === undefined) { return base; }
      return result !== NOTHING ? result : undefined;
    }
  };

  Immer.prototype.createDraft = function createDraft (base) {
    if (!isDraftable(base)) {
      throw new Error("First argument to `createDraft` must be a plain object, an array, or an immerable object"); // prettier-ignore
    }

    var scope = ImmerScope.enter();
    var proxy = this.createProxy(base);
    proxy[DRAFT_STATE].isManual = true;
    scope.leave();
    return proxy;
  };

  Immer.prototype.finishDraft = function finishDraft (draft, patchListener) {
    var state = draft && draft[DRAFT_STATE];

    if (!state || !state.isManual) {
      throw new Error("First argument to `finishDraft` must be a draft returned by `createDraft`"); // prettier-ignore
    }

    if (state.finalized) {
      throw new Error("The given draft is already finalized"); // prettier-ignore
    }

    var scope = state.scope;
    scope.usePatches(patchListener);
    return this.processResult(undefined, scope);
  };

  Immer.prototype.setAutoFreeze = function setAutoFreeze (value) {
    this.autoFreeze = value;
  };

  Immer.prototype.setUseProxies = function setUseProxies (value) {
    this.useProxies = value;
    assign(this, value ? modernProxy : legacyProxy);
  };

  Immer.prototype.applyPatches = function applyPatches$1 (base, patches) {
    // Mutate the base state when a draft is passed.
    if (isDraft(base)) {
      return applyPatches(base, patches);
    } // Otherwise, produce a copy of the base state.


    return this.produce(base, function (draft) { return applyPatches(draft, patches); });
  };
  /** @internal */


  Immer.prototype.processResult = function processResult (result, scope) {
    var baseDraft = scope.drafts[0];
    var isReplaced = result !== undefined && result !== baseDraft;
    this.willFinalize(scope, result, isReplaced);

    if (isReplaced) {
      if (baseDraft[DRAFT_STATE].modified) {
        scope.revoke();
        throw new Error("An immer producer returned a new value *and* modified its draft. Either return a new value *or* modify the draft."); // prettier-ignore
      }

      if (isDraftable(result)) {
        // Finalize the result in case it contains (or is) a subset of the draft.
        result = this.finalize(result, null, scope);
      }

      if (scope.patches) {
        scope.patches.push({
          op: "replace",
          path: [],
          value: result
        });
        scope.inversePatches.push({
          op: "replace",
          path: [],
          value: baseDraft[DRAFT_STATE].base
        });
      }
    } else {
      // Finalize the base draft.
      result = this.finalize(baseDraft, [], scope);
    }

    scope.revoke();

    if (scope.patches) {
      scope.patchListener(scope.patches, scope.inversePatches);
    }

    return result !== NOTHING ? result : undefined;
  };
  /**
   * @internal
   * Finalize a draft, returning either the unmodified base state or a modified
   * copy of the base state.
   */


  Immer.prototype.finalize = function finalize (draft, path, scope) {
      var this$1 = this;

    var state = draft[DRAFT_STATE];

    if (!state) {
      if (Object.isFrozen(draft)) { return draft; }
      return this.finalizeTree(draft, null, scope);
    } // Never finalize drafts owned by another scope.


    if (state.scope !== scope) {
      return draft;
    }

    if (!state.modified) {
      return state.base;
    }

    if (!state.finalized) {
      state.finalized = true;
      this.finalizeTree(state.draft, path, scope);

      if (this.onDelete) {
        // The `assigned` object is unreliable with ES5 drafts.
        if (this.useProxies) {
          var assigned = state.assigned;

          for (var prop in assigned) {
            if (!assigned[prop]) { this.onDelete(state, prop); }
          }
        } else {
          var base = state.base;
            var copy = state.copy;
          each(base, function (prop) {
            if (!has(copy, prop)) { this$1.onDelete(state, prop); }
          });
        }
      }

      if (this.onCopy) {
        this.onCopy(state);
      } // At this point, all descendants of `state.copy` have been finalized,
      // so we can be sure that `scope.canAutoFreeze` is accurate.


      if (this.autoFreeze && scope.canAutoFreeze) {
        Object.freeze(state.copy);
      }

      if (path && scope.patches) {
        generatePatches(state, path, scope.patches, scope.inversePatches);
      }
    }

    return state.copy;
  };
  /**
   * @internal
   * Finalize all drafts in the given state tree.
   */


  Immer.prototype.finalizeTree = function finalizeTree (root, rootPath, scope) {
      var this$1 = this;

    var state = root[DRAFT_STATE];

    if (state) {
      if (!this.useProxies) {
        // Create the final copy, with added keys and without deleted keys.
        state.copy = shallowCopy(state.draft, true);
      }

      root = state.copy;
    }

    var needPatches = !!rootPath && !!scope.patches;

    var finalizeProperty = function (prop, value, parent) {
      if (value === parent) {
        throw Error("Immer forbids circular references");
      } // In the `finalizeTree` method, only the `root` object may be a draft.


      var isDraftProp = !!state && parent === root;

      if (isDraft(value)) {
        var path = isDraftProp && needPatches && !state.assigned[prop] ? rootPath.concat(prop) : null; // Drafts owned by `scope` are finalized here.

        value = this$1.finalize(value, path, scope); // Drafts from another scope must prevent auto-freezing.

        if (isDraft(value)) {
          scope.canAutoFreeze = false;
        } // Preserve non-enumerable properties.


        if (Array.isArray(parent) || isEnumerable(parent, prop)) {
          parent[prop] = value;
        } else {
          Object.defineProperty(parent, prop, {
            value: value
          });
        } // Unchanged drafts are never passed to the `onAssign` hook.


        if (isDraftProp && value === state.base[prop]) { return; }
      } // Unchanged draft properties are ignored.
      else if (isDraftProp && is(value, state.base[prop])) {
          return;
        } // Search new objects for unfinalized drafts. Frozen objects should never contain drafts.
        else if (isDraftable(value) && !Object.isFrozen(value)) {
            each(value, finalizeProperty);
          }

      if (isDraftProp && this$1.onAssign) {
        this$1.onAssign(state, prop, value);
      }
    };

    each(root, finalizeProperty);
    return root;
  };

  var immer = new Immer();
  /**
   * Pass true to automatically freeze all copies created by Immer.
   *
   * By default, auto-freezing is disabled in production.
   */

  var setAutoFreeze = immer.setAutoFreeze.bind(immer);
  /**
   * Pass true to use the ES2015 `Proxy` class when creating drafts, which is
   * always faster than using ES5 proxies.
   *
   * By default, feature detection is used, so calling this is rarely necessary.
   */

  var setUseProxies = immer.setUseProxies.bind(immer);
  /**
   * Apply an array of Immer patches to the first argument.
   *
   * This function is a producer, which means copy-on-write is in effect.
   */

  var applyPatches$1 = immer.applyPatches.bind(immer);
  /**
   * Create an Immer draft from the given base state, which may be a draft itself.
   * The draft can be modified until you finalize it with the `finishDraft` function.
   */

  var createDraft = immer.createDraft.bind(immer);
  /**
   * Finalize an Immer draft from a `createDraft` call, returning the base state
   * (if no changes were made) or a modified copy. The draft must *not* be
   * mutated afterwards.
   *
   * Pass a function as the 2nd argument to generate Immer patches based on the
   * changes that were made.
   */

  var finishDraft = immer.finishDraft.bind(immer);

  function symbolObservablePonyfill(root) {
  	var result;
  	var Symbol = root.Symbol;

  	if (typeof Symbol === 'function') {
  		if (Symbol.observable) {
  			result = Symbol.observable;
  		} else {
  			result = Symbol('observable');
  			Symbol.observable = result;
  		}
  	} else {
  		result = '@@observable';
  	}

  	return result;
  }

  /* global window */

  var root;

  if (typeof self !== 'undefined') {
    root = self;
  } else if (typeof window !== 'undefined') {
    root = window;
  } else if (typeof global !== 'undefined') {
    root = global;
  } else if (typeof module !== 'undefined') {
    root = module;
  } else {
    root = Function('return this')();
  }

  var result = symbolObservablePonyfill(root);

  /**
   * These are private action types reserved by Redux.
   * For any unknown actions, you must return the current state.
   * If the current state is undefined, you must return the initial state.
   * Do not reference these action types directly in your code.
   */
  var randomString = function randomString() {
    return Math.random().toString(36).substring(7).split('').join('.');
  };

  var ActionTypes = {
    INIT: "@@redux/INIT" + randomString(),
    REPLACE: "@@redux/REPLACE" + randomString(),
    PROBE_UNKNOWN_ACTION: function PROBE_UNKNOWN_ACTION() {
      return "@@redux/PROBE_UNKNOWN_ACTION" + randomString();
    }
  };

  /**
   * @param {any} obj The object to inspect.
   * @returns {boolean} True if the argument appears to be a plain object.
   */
  function isPlainObject(obj) {
    if (typeof obj !== 'object' || obj === null) return false;
    var proto = obj;

    while (Object.getPrototypeOf(proto) !== null) {
      proto = Object.getPrototypeOf(proto);
    }

    return Object.getPrototypeOf(obj) === proto;
  }

  /**
   * Creates a Redux store that holds the state tree.
   * The only way to change the data in the store is to call `dispatch()` on it.
   *
   * There should only be a single store in your app. To specify how different
   * parts of the state tree respond to actions, you may combine several reducers
   * into a single reducer function by using `combineReducers`.
   *
   * @param {Function} reducer A function that returns the next state tree, given
   * the current state tree and the action to handle.
   *
   * @param {any} [preloadedState] The initial state. You may optionally specify it
   * to hydrate the state from the server in universal apps, or to restore a
   * previously serialized user session.
   * If you use `combineReducers` to produce the root reducer function, this must be
   * an object with the same shape as `combineReducers` keys.
   *
   * @param {Function} [enhancer] The store enhancer. You may optionally specify it
   * to enhance the store with third-party capabilities such as middleware,
   * time travel, persistence, etc. The only store enhancer that ships with Redux
   * is `applyMiddleware()`.
   *
   * @returns {Store} A Redux store that lets you read the state, dispatch actions
   * and subscribe to changes.
   */

  function createStore(reducer, preloadedState, enhancer) {
    var _ref2;

    if (typeof preloadedState === 'function' && typeof enhancer === 'function' || typeof enhancer === 'function' && typeof arguments[3] === 'function') {
      throw new Error('It looks like you are passing several store enhancers to ' + 'createStore(). This is not supported. Instead, compose them ' + 'together to a single function.');
    }

    if (typeof preloadedState === 'function' && typeof enhancer === 'undefined') {
      enhancer = preloadedState;
      preloadedState = undefined;
    }

    if (typeof enhancer !== 'undefined') {
      if (typeof enhancer !== 'function') {
        throw new Error('Expected the enhancer to be a function.');
      }

      return enhancer(createStore)(reducer, preloadedState);
    }

    if (typeof reducer !== 'function') {
      throw new Error('Expected the reducer to be a function.');
    }

    var currentReducer = reducer;
    var currentState = preloadedState;
    var currentListeners = [];
    var nextListeners = currentListeners;
    var isDispatching = false;
    /**
     * This makes a shallow copy of currentListeners so we can use
     * nextListeners as a temporary list while dispatching.
     *
     * This prevents any bugs around consumers calling
     * subscribe/unsubscribe in the middle of a dispatch.
     */

    function ensureCanMutateNextListeners() {
      if (nextListeners === currentListeners) {
        nextListeners = currentListeners.slice();
      }
    }
    /**
     * Reads the state tree managed by the store.
     *
     * @returns {any} The current state tree of your application.
     */


    function getState() {
      if (isDispatching) {
        throw new Error('You may not call store.getState() while the reducer is executing. ' + 'The reducer has already received the state as an argument. ' + 'Pass it down from the top reducer instead of reading it from the store.');
      }

      return currentState;
    }
    /**
     * Adds a change listener. It will be called any time an action is dispatched,
     * and some part of the state tree may potentially have changed. You may then
     * call `getState()` to read the current state tree inside the callback.
     *
     * You may call `dispatch()` from a change listener, with the following
     * caveats:
     *
     * 1. The subscriptions are snapshotted just before every `dispatch()` call.
     * If you subscribe or unsubscribe while the listeners are being invoked, this
     * will not have any effect on the `dispatch()` that is currently in progress.
     * However, the next `dispatch()` call, whether nested or not, will use a more
     * recent snapshot of the subscription list.
     *
     * 2. The listener should not expect to see all state changes, as the state
     * might have been updated multiple times during a nested `dispatch()` before
     * the listener is called. It is, however, guaranteed that all subscribers
     * registered before the `dispatch()` started will be called with the latest
     * state by the time it exits.
     *
     * @param {Function} listener A callback to be invoked on every dispatch.
     * @returns {Function} A function to remove this change listener.
     */


    function subscribe(listener) {
      if (typeof listener !== 'function') {
        throw new Error('Expected the listener to be a function.');
      }

      if (isDispatching) {
        throw new Error('You may not call store.subscribe() while the reducer is executing. ' + 'If you would like to be notified after the store has been updated, subscribe from a ' + 'component and invoke store.getState() in the callback to access the latest state. ' + 'See https://redux.js.org/api-reference/store#subscribe(listener) for more details.');
      }

      var isSubscribed = true;
      ensureCanMutateNextListeners();
      nextListeners.push(listener);
      return function unsubscribe() {
        if (!isSubscribed) {
          return;
        }

        if (isDispatching) {
          throw new Error('You may not unsubscribe from a store listener while the reducer is executing. ' + 'See https://redux.js.org/api-reference/store#subscribe(listener) for more details.');
        }

        isSubscribed = false;
        ensureCanMutateNextListeners();
        var index = nextListeners.indexOf(listener);
        nextListeners.splice(index, 1);
      };
    }
    /**
     * Dispatches an action. It is the only way to trigger a state change.
     *
     * The `reducer` function, used to create the store, will be called with the
     * current state tree and the given `action`. Its return value will
     * be considered the **next** state of the tree, and the change listeners
     * will be notified.
     *
     * The base implementation only supports plain object actions. If you want to
     * dispatch a Promise, an Observable, a thunk, or something else, you need to
     * wrap your store creating function into the corresponding middleware. For
     * example, see the documentation for the `redux-thunk` package. Even the
     * middleware will eventually dispatch plain object actions using this method.
     *
     * @param {Object} action A plain object representing “what changed”. It is
     * a good idea to keep actions serializable so you can record and replay user
     * sessions, or use the time travelling `redux-devtools`. An action must have
     * a `type` property which may not be `undefined`. It is a good idea to use
     * string constants for action types.
     *
     * @returns {Object} For convenience, the same action object you dispatched.
     *
     * Note that, if you use a custom middleware, it may wrap `dispatch()` to
     * return something else (for example, a Promise you can await).
     */


    function dispatch(action) {
      if (!isPlainObject(action)) {
        throw new Error('Actions must be plain objects. ' + 'Use custom middleware for async actions.');
      }

      if (typeof action.type === 'undefined') {
        throw new Error('Actions may not have an undefined "type" property. ' + 'Have you misspelled a constant?');
      }

      if (isDispatching) {
        throw new Error('Reducers may not dispatch actions.');
      }

      try {
        isDispatching = true;
        currentState = currentReducer(currentState, action);
      } finally {
        isDispatching = false;
      }

      var listeners = currentListeners = nextListeners;

      for (var i = 0; i < listeners.length; i++) {
        var listener = listeners[i];
        listener();
      }

      return action;
    }
    /**
     * Replaces the reducer currently used by the store to calculate the state.
     *
     * You might need this if your app implements code splitting and you want to
     * load some of the reducers dynamically. You might also need this if you
     * implement a hot reloading mechanism for Redux.
     *
     * @param {Function} nextReducer The reducer for the store to use instead.
     * @returns {void}
     */


    function replaceReducer(nextReducer) {
      if (typeof nextReducer !== 'function') {
        throw new Error('Expected the nextReducer to be a function.');
      }

      currentReducer = nextReducer; // This action has a similiar effect to ActionTypes.INIT.
      // Any reducers that existed in both the new and old rootReducer
      // will receive the previous state. This effectively populates
      // the new state tree with any relevant data from the old one.

      dispatch({
        type: ActionTypes.REPLACE
      });
    }
    /**
     * Interoperability point for observable/reactive libraries.
     * @returns {observable} A minimal observable of state changes.
     * For more information, see the observable proposal:
     * https://github.com/tc39/proposal-observable
     */


    function observable() {
      var _ref;

      var outerSubscribe = subscribe;
      return _ref = {
        /**
         * The minimal observable subscription method.
         * @param {Object} observer Any object that can be used as an observer.
         * The observer object should have a `next` method.
         * @returns {subscription} An object with an `unsubscribe` method that can
         * be used to unsubscribe the observable from the store, and prevent further
         * emission of values from the observable.
         */
        subscribe: function subscribe(observer) {
          if (typeof observer !== 'object' || observer === null) {
            throw new TypeError('Expected the observer to be an object.');
          }

          function observeState() {
            if (observer.next) {
              observer.next(getState());
            }
          }

          observeState();
          var unsubscribe = outerSubscribe(observeState);
          return {
            unsubscribe: unsubscribe
          };
        }
      }, _ref[result] = function () {
        return this;
      }, _ref;
    } // When a store is created, an "INIT" action is dispatched so that every
    // reducer returns their initial state. This effectively populates
    // the initial state tree.


    dispatch({
      type: ActionTypes.INIT
    });
    return _ref2 = {
      dispatch: dispatch,
      subscribe: subscribe,
      getState: getState,
      replaceReducer: replaceReducer
    }, _ref2[result] = observable, _ref2;
  }

  /**
   * Prints a warning in the console if it exists.
   *
   * @param {String} message The warning message.
   * @returns {void}
   */
  function warning(message) {
    /* eslint-disable no-console */
    if (typeof console !== 'undefined' && typeof console.error === 'function') {
      console.error(message);
    }
    /* eslint-enable no-console */


    try {
      // This error was thrown as a convenience so that if you enable
      // "break on all exceptions" in your console,
      // it would pause the execution at this line.
      throw new Error(message);
    } catch (e) {} // eslint-disable-line no-empty

  }

  function _defineProperty(obj, key, value) {
    if (key in obj) {
      Object.defineProperty(obj, key, {
        value: value,
        enumerable: true,
        configurable: true,
        writable: true
      });
    } else {
      obj[key] = value;
    }

    return obj;
  }

  function ownKeys$1(object, enumerableOnly) {
    var keys = Object.keys(object);

    if (Object.getOwnPropertySymbols) {
      keys.push.apply(keys, Object.getOwnPropertySymbols(object));
    }

    if (enumerableOnly) keys = keys.filter(function (sym) {
      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
    });
    return keys;
  }

  function _objectSpread2(target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i] != null ? arguments[i] : {};

      if (i % 2) {
        ownKeys$1(source, true).forEach(function (key) {
          _defineProperty(target, key, source[key]);
        });
      } else if (Object.getOwnPropertyDescriptors) {
        Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
      } else {
        ownKeys$1(source).forEach(function (key) {
          Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
        });
      }
    }

    return target;
  }

  /**
   * Composes single-argument functions from right to left. The rightmost
   * function can take multiple arguments as it provides the signature for
   * the resulting composite function.
   *
   * @param {...Function} funcs The functions to compose.
   * @returns {Function} A function obtained by composing the argument functions
   * from right to left. For example, compose(f, g, h) is identical to doing
   * (...args) => f(g(h(...args))).
   */
  function compose() {
    for (var _len = arguments.length, funcs = new Array(_len), _key = 0; _key < _len; _key++) {
      funcs[_key] = arguments[_key];
    }

    if (funcs.length === 0) {
      return function (arg) {
        return arg;
      };
    }

    if (funcs.length === 1) {
      return funcs[0];
    }

    return funcs.reduce(function (a, b) {
      return function () {
        return a(b.apply(void 0, arguments));
      };
    });
  }

  /**
   * Creates a store enhancer that applies middleware to the dispatch method
   * of the Redux store. This is handy for a variety of tasks, such as expressing
   * asynchronous actions in a concise manner, or logging every action payload.
   *
   * See `redux-thunk` package as an example of the Redux middleware.
   *
   * Because middleware is potentially asynchronous, this should be the first
   * store enhancer in the composition chain.
   *
   * Note that each middleware will be given the `dispatch` and `getState` functions
   * as named arguments.
   *
   * @param {...Function} middlewares The middleware chain to be applied.
   * @returns {Function} A store enhancer applying the middleware.
   */

  function applyMiddleware() {
    for (var _len = arguments.length, middlewares = new Array(_len), _key = 0; _key < _len; _key++) {
      middlewares[_key] = arguments[_key];
    }

    return function (createStore) {
      return function () {
        var store = createStore.apply(void 0, arguments);

        var _dispatch = function dispatch() {
          throw new Error('Dispatching while constructing your middleware is not allowed. ' + 'Other middleware would not be applied to this dispatch.');
        };

        var middlewareAPI = {
          getState: store.getState,
          dispatch: function dispatch() {
            return _dispatch.apply(void 0, arguments);
          }
        };
        var chain = middlewares.map(function (middleware) {
          return middleware(middlewareAPI);
        });
        _dispatch = compose.apply(void 0, chain)(store.dispatch);
        return _objectSpread2({}, store, {
          dispatch: _dispatch
        });
      };
    };
  }

  /*
   * This is a dummy function to check if the function name has been altered by minification.
   * If the function has been minified and NODE_ENV !== 'production', warn the user.
   */

  function isCrushed() {}

  if (process.env.NODE_ENV !== 'production' && typeof isCrushed.name === 'string' && isCrushed.name !== 'isCrushed') {
    warning('You are currently using minified code outside of NODE_ENV === "production". ' + 'This means that you are running a slower development build of Redux. ' + 'You can use loose-envify (https://github.com/zertosh/loose-envify) for browserify ' + 'or setting mode to production in webpack (https://webpack.js.org/concepts/mode/) ' + 'to ensure you have the correct code for your production build.');
  }

  function createThunkMiddleware(extraArgument) {
    return function (_ref) {
      var dispatch = _ref.dispatch,
          getState = _ref.getState;
      return function (next) {
        return function (action) {
          if (typeof action === 'function') {
            return action(dispatch, getState, extraArgument);
          }

          return next(action);
        };
      };
    };
  }

  var thunk = createThunkMiddleware();
  thunk.withExtraArgument = createThunkMiddleware;

  function Similar() {
  	this.list = [];
  	this.lastItem = undefined;
  	this.size = 0;

  	return this;
  }

  Similar.prototype.get = function(key) {
  	var index;

  	if (this.lastItem && this.isEqual(this.lastItem.key, key)) {
  		return this.lastItem.val;
  	}

  	index = this.indexOf(key);
  	if (index >= 0) {
  		this.lastItem = this.list[index];
  		return this.list[index].val;
  	}

  	return undefined;
  };

  Similar.prototype.set = function(key, val) {
  	var index;

  	if (this.lastItem && this.isEqual(this.lastItem.key, key)) {
  		this.lastItem.val = val;
  		return this;
  	}

  	index = this.indexOf(key);
  	if (index >= 0) {
  		this.lastItem = this.list[index];
  		this.list[index].val = val;
  		return this;
  	}

  	this.lastItem = { key: key, val: val };
  	this.list.push(this.lastItem);
  	this.size++;

  	return this;
  };

  Similar.prototype.delete = function(key) {
  	var index;

  	if (this.lastItem && this.isEqual(this.lastItem.key, key)) {
  		this.lastItem = undefined;
  	}

  	index = this.indexOf(key);
  	if (index >= 0) {
  		this.size--;
  		return this.list.splice(index, 1)[0];
  	}

  	return undefined;
  };


  // important that has() doesn't use get() in case an existing key has a falsy value, in which case has() would return false
  Similar.prototype.has = function(key) {
  	var index;

  	if (this.lastItem && this.isEqual(this.lastItem.key, key)) {
  		return true;
  	}

  	index = this.indexOf(key);
  	if (index >= 0) {
  		this.lastItem = this.list[index];
  		return true;
  	}

  	return false;
  };

  Similar.prototype.forEach = function(callback, thisArg) {
  	var i;
  	for (i = 0; i < this.size; i++) {
  		callback.call(thisArg || this, this.list[i].val, this.list[i].key, this);
  	}
  };

  Similar.prototype.indexOf = function(key) {
  	var i;
  	for (i = 0; i < this.size; i++) {
  		if (this.isEqual(this.list[i].key, key)) {
  			return i;
  		}
  	}
  	return -1;
  };

  // check if the numbers are equal, or whether they are both precisely NaN (isNaN returns true for all non-numbers)
  Similar.prototype.isEqual = function(val1, val2) {
  	return val1 === val2 || (val1 !== val1 && val2 !== val2);
  };

  var similar = Similar;

  var mapOrSimilar = function(forceSimilar) {
  	if (typeof Map !== 'function' || forceSimilar) {
  		var Similar = similar;
  		return new Similar();
  	}
  	else {
  		return new Map();
  	}
  };

  var memoizerific = function (limit) {
  	var cache = new mapOrSimilar(process.env.FORCE_SIMILAR_INSTEAD_OF_MAP === 'true'),
  		lru = [];

  	return function (fn) {
  		var memoizerific = function () {
  			var currentCache = cache,
  				newMap,
  				fnResult,
  				argsLengthMinusOne = arguments.length - 1,
  				lruPath = Array(argsLengthMinusOne + 1),
  				isMemoized = true,
  				i;

  			if ((memoizerific.numArgs || memoizerific.numArgs === 0) && memoizerific.numArgs !== argsLengthMinusOne + 1) {
  				throw new Error('Memoizerific functions should always be called with the same number of arguments');
  			}

  			// loop through each argument to traverse the map tree
  			for (i = 0; i < argsLengthMinusOne; i++) {
  				lruPath[i] = {
  					cacheItem: currentCache,
  					arg: arguments[i]
  				};

  				// climb through the hierarchical map tree until the second-last argument has been found, or an argument is missing.
  				// if all arguments up to the second-last have been found, this will potentially be a cache hit (determined later)
  				if (currentCache.has(arguments[i])) {
  					currentCache = currentCache.get(arguments[i]);
  					continue;
  				}

  				isMemoized = false;

  				// make maps until last value
  				newMap = new mapOrSimilar(process.env.FORCE_SIMILAR_INSTEAD_OF_MAP === 'true');
  				currentCache.set(arguments[i], newMap);
  				currentCache = newMap;
  			}

  			// we are at the last arg, check if it is really memoized
  			if (isMemoized) {
  				if (currentCache.has(arguments[argsLengthMinusOne])) {
  					fnResult = currentCache.get(arguments[argsLengthMinusOne]);
  				}
  				else {
  					isMemoized = false;
  				}
  			}

  			// if the result wasn't memoized, compute it and cache it
  			if (!isMemoized) {
  				fnResult = fn.apply(null, arguments);
  				currentCache.set(arguments[argsLengthMinusOne], fnResult);
  			}

  			// if there is a cache limit, purge any extra results
  			if (limit > 0) {
  				lruPath[argsLengthMinusOne] = {
  					cacheItem: currentCache,
  					arg: arguments[argsLengthMinusOne]
  				};

  				if (isMemoized) {
  					moveToMostRecentLru(lru, lruPath);
  				}
  				else {
  					lru.push(lruPath);
  				}

  				if (lru.length > limit) {
  					removeCachedResult(lru.shift());
  				}
  			}

  			memoizerific.wasMemoized = isMemoized;
  			memoizerific.numArgs = argsLengthMinusOne + 1;

  			return fnResult;
  		};

  		memoizerific.limit = limit;
  		memoizerific.wasMemoized = false;
  		memoizerific.cache = cache;
  		memoizerific.lru = lru;

  		return memoizerific;
  	};
  };

  // move current args to most recent position
  function moveToMostRecentLru(lru, lruPath) {
  	var lruLen = lru.length,
  		lruPathLen = lruPath.length,
  		isMatch,
  		i, ii;

  	for (i = 0; i < lruLen; i++) {
  		isMatch = true;
  		for (ii = 0; ii < lruPathLen; ii++) {
  			if (!isEqual(lru[i][ii].arg, lruPath[ii].arg)) {
  				isMatch = false;
  				break;
  			}
  		}
  		if (isMatch) {
  			break;
  		}
  	}

  	lru.push(lru.splice(i, 1)[0]);
  }

  // remove least recently used cache item and all dead branches
  function removeCachedResult(removedLru) {
  	var removedLruLen = removedLru.length,
  		currentLru = removedLru[removedLruLen - 1],
  		tmp,
  		i;

  	currentLru.cacheItem.delete(currentLru.arg);

  	// walk down the tree removing dead branches (size 0) along the way
  	for (i = removedLruLen - 2; i >= 0; i--) {
  		currentLru = removedLru[i];
  		tmp = currentLru.cacheItem.get(currentLru.arg);

  		if (!tmp || !tmp.size) {
  			currentLru.cacheItem.delete(currentLru.arg);
  		} else {
  			break;
  		}
  	}
  }

  // check if the numbers are equal, or whether they are both precisely NaN (isNaN returns true for all non-numbers)
  function isEqual(val1, val2) {
  	return val1 === val2 || (val1 !== val1 && val2 !== val2);
  }

  var StoreContext = React.createContext();

  // To get around it, we can conditionally useEffect on the server (no-op) and
  // useLayoutEffect in the browser. We need useLayoutEffect to ensure the store
  // subscription callback always has the selector from the latest render commit
  // available, otherwise a store update may happen between render and the effect,
  // which may cause missed updates; we also must ensure the store subscription
  // is created synchronously, otherwise a store update may occur before the
  // subscription is created and an inconsistent state may be observed

  var useIsomorphicLayoutEffect = typeof window !== 'undefined' ? React.useLayoutEffect : React.useEffect;
  function createStoreStateHook(Context) {
    return function useStoreState(mapState) {
      var store = React.useContext(Context);
      var mapStateRef = React.useRef(mapState);
      var stateRef = React.useRef();
      var mountedRef = React.useRef(true);
      var subscriptionMapStateError = React.useRef();

      var _useReducer = React.useReducer(function (s) {
        return s + 1;
      }, 0),
          forceRender = _useReducer[1];

      if (subscriptionMapStateError.current || mapStateRef.current !== mapState || stateRef.current === undefined) {
        try {
          stateRef.current = mapState(store.getState());
        } catch (err) {
          var errorMessage = "An error occurred trying to map state in a useStoreState hook: " + err.message + ".";

          if (subscriptionMapStateError.current) {
            errorMessage += "\nThis error may be related to the following error:\n" + subscriptionMapStateError.current.stack + "\n\nOriginal stack trace:";
          }

          throw new Error(errorMessage);
        }
      }

      useIsomorphicLayoutEffect(function () {
        mapStateRef.current = mapState;
        subscriptionMapStateError.current = undefined;
      });
      useIsomorphicLayoutEffect(function () {
        var checkMapState = function checkMapState() {
          try {
            var newState = mapStateRef.current(store.getState());

            if (newState === stateRef.current) {
              return;
            }

            stateRef.current = newState;
          } catch (err) {
            // see https://github.com/reduxjs/react-redux/issues/1179
            // There is a possibility mapState will fail due to stale state or
            // props, therefore we will just track the error and force our
            // component to update. It should then receive the updated state
            subscriptionMapStateError.current = err;
          }

          if (mountedRef.current) {
            forceRender({});
          }
        };

        var unsubscribe = store.subscribe(checkMapState);
        checkMapState();
        return function () {
          mountedRef.current = false;
          unsubscribe();
        };
      }, []);
      return stateRef.current;
    };
  }
  var useStoreState = createStoreStateHook(StoreContext);
  function createStoreActionsHook(Context) {
    return function useStoreActions(mapActions) {
      var store = React.useContext(Context);
      return mapActions(store.getActions());
    };
  }
  var useStoreActions = createStoreActionsHook(StoreContext);

  function _extends() {
    _extends = Object.assign || function (target) {
      for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i];

        for (var key in source) {
          if (Object.prototype.hasOwnProperty.call(source, key)) {
            target[key] = source[key];
          }
        }
      }

      return target;
    };

    return _extends.apply(this, arguments);
  }

  var actionSymbol = '🙈action🙈';
  var actionOnSymbol = '🙈actionOn🙈';
  var computedSymbol = '🙈computedSymbol🙈';
  var reducerSymbol = '🙈reducer🙈';
  var thunkOnSymbol = '🙈thunkOn🙈';
  var thunkSymbol = '🙈thunk🙈';
  var action = function action(fn) {
    fn[actionSymbol] = {};
    return fn;
  };

  var isStateObject = function isStateObject(x) {
    return x !== null && typeof x === 'object' && !Array.isArray(x) && x.constructor === Object;
  };
  var get$2 = function get(path, target) {
    return path.reduce(function (acc, cur) {
      return isStateObject(acc) ? acc[cur] : undefined;
    }, target);
  };
  var set$2 = function set(path, target, value) {
    path.reduce(function (acc, cur, idx) {
      if (idx + 1 === path.length) {
        acc[cur] = value;
      } else {
        acc[cur] = acc[cur] || {};
      }

      return acc[cur];
    }, target);
  };

  var newify = function newify(currentPath, currentState, finalValue) {
    if (currentPath.length === 0) {
      return finalValue;
    }

    var newState = _extends({}, currentState);

    var key = currentPath[0];

    if (currentPath.length === 1) {
      newState[key] = finalValue;
    } else {
      newState[key] = newify(currentPath.slice(1), newState[key], finalValue);
    }

    return newState;
  };

  function createStoreInternals(_ref) {
    var disableImmer = _ref.disableImmer,
        initialState = _ref.initialState,
        injections = _ref.injections,
        model = _ref.model,
        reducerEnhancer = _ref.reducerEnhancer,
        references = _ref.references;

    function simpleProduce(path, state, fn) {
      if (disableImmer) {
        var _current = get$2(path, state);

        var next = fn(_current);

        if (_current !== next) {
          return newify(path, state, next);
        }

        return state;
      }

      var draft = createDraft(state);

      var current = get$2(path, draft);

      fn(current);
      return finishDraft(draft);
    }

    var defaultState = initialState;
    var actionCreatorDict = {};
    var actionCreators = {};
    var actionReducersDict = {};
    var actionThunks = {};
    var computedProperties = [];
    var customReducers = [];
    var listenerActionCreators = {};
    var listenerActionMap = {};
    var listenerDefinitions = [];
    var computedState = {
      isInReducer: false,
      currentState: defaultState
    };

    var recursiveExtractDefsFromModel = function recursiveExtractDefsFromModel(current, parentPath) {
      return Object.keys(current).forEach(function (key) {
        var value = current[key];
        var path = [].concat(parentPath, [key]);
        var meta = {
          parent: parentPath,
          path: path
        };

        var handleValueAsState = function handleValueAsState() {
          var initialParentRef = get$2(parentPath, initialState);

          if (initialParentRef && key in initialParentRef) {
            set$2(path, defaultState, initialParentRef[key]);
          } else {
            set$2(path, defaultState, value);
          }
        };

        if (typeof value === 'function') {
          if (value[actionSymbol] || value[actionOnSymbol]) {
            var prefix = value[actionSymbol] ? '@action' : '@actionOn';
            var type = prefix + "." + path.join('.');
            var actionMeta = value[actionSymbol] || value[actionOnSymbol];
            actionMeta.actionName = key;
            actionMeta.type = type;
            actionMeta.parent = meta.parent;
            actionMeta.path = meta.path; // Action Reducer

            actionReducersDict[type] = value; // Action Creator

            var actionCreator = function actionCreator(payload) {
              var actionDefinition = {
                type: type,
                payload: payload
              };

              if (value[actionOnSymbol] && actionMeta.resolvedTargets) {
                payload.resolvedTargets = [].concat(actionMeta.resolvedTargets);
              }

              var result = references.dispatch(actionDefinition);
              return result;
            };

            actionCreator.type = type;
            actionCreatorDict[type] = actionCreator;

            if (key !== 'easyPeasyReplaceState') {
              if (value[actionOnSymbol]) {
                listenerDefinitions.push(value);
                set$2(path, listenerActionCreators, actionCreator);
              } else {
                set$2(path, actionCreators, actionCreator);
              }
            }
          } else if (value[thunkSymbol] || value[thunkOnSymbol]) {
            var _prefix = value[thunkSymbol] ? '@thunk' : '@thunkOn';

            var _type = _prefix + "." + path.join('.');

            var thunkMeta = value[thunkSymbol] || value[thunkOnSymbol];
            thunkMeta.actionName = key;
            thunkMeta.type = _type;
            thunkMeta.parent = meta.parent;
            thunkMeta.path = meta.path; // Thunk Action

            var thunkHandler = function thunkHandler(payload) {
              var helpers = {
                dispatch: references.dispatch,
                getState: function getState() {
                  return get$2(parentPath, references.getState());
                },
                getStoreActions: function getStoreActions() {
                  return actionCreators;
                },
                getStoreState: references.getState,
                injections: injections,
                meta: meta
              };

              if (value[thunkOnSymbol] && thunkMeta.resolvedTargets) {
                payload.resolvedTargets = [].concat(thunkMeta.resolvedTargets);
              }

              return value(get$2(parentPath, actionCreators), payload, helpers);
            };

            set$2(path, actionThunks, thunkHandler); // Thunk Action Creator

            var startType = _type + "(start)";
            var successType = _type + "(success)";
            var failType = _type + "(fail)";

            var _actionCreator = function _actionCreator(payload) {
              var dispatchError = function dispatchError(err) {
                references.dispatch({
                  type: failType,
                  payload: payload,
                  error: err
                });
                references.dispatch({
                  type: _type,
                  payload: payload,
                  error: err
                });
              };

              var dispatchSuccess = function dispatchSuccess(result) {
                references.dispatch({
                  type: successType,
                  payload: payload,
                  result: result
                });
                references.dispatch({
                  type: _type,
                  payload: payload,
                  result: result
                });
              };

              references.dispatch({
                type: startType,
                payload: payload
              });

              try {
                var result = references.dispatch(function () {
                  return thunkHandler(payload);
                });

                if (typeof result === 'object' && typeof result.then === 'function') {
                  return result.then(function (resolved) {
                    dispatchSuccess(resolved);
                    return resolved;
                  }).catch(function (err) {
                    dispatchError(err);
                    throw err;
                  });
                }

                dispatchSuccess(result);
                return result;
              } catch (err) {
                dispatchError(err);
                throw err;
              }
            };

            _actionCreator.type = _type;
            _actionCreator.startType = startType;
            _actionCreator.successType = successType;
            _actionCreator.failType = failType;
            actionCreatorDict[_type] = _actionCreator;

            if (value[thunkOnSymbol]) {
              listenerDefinitions.push(value);
              set$2(path, listenerActionCreators, _actionCreator);
            } else {
              set$2(path, actionCreators, _actionCreator);
            }
          } else if (value[computedSymbol]) {
            var parent = get$2(parentPath, defaultState);

            var computedMeta = value[computedSymbol];
            var memoisedResultFn = memoizerific(1)(value);

            var createComputedProperty = function createComputedProperty(o) {
              Object.defineProperty(o, key, {
                configurable: true,
                enumerable: true,
                get: function get$1() {
                  var storeState;

                  if (computedState.isInReducer) {
                    storeState = computedState.currentState;
                  } else if (references.getState == null) {
                    return undefined;
                  } else {
                    try {
                      storeState = references.getState();
                    } catch (err) {
                      if (process.env.NODE_ENV !== 'production') {
                        console.warn('Invalid access attempt to a computed property');
                      }

                      return undefined;
                    }
                  }

                  var state = get$2(parentPath, storeState);

                  var inputs = computedMeta.stateResolvers.map(function (resolver) {
                    return resolver(state, storeState);
                  });
                  return memoisedResultFn.apply(void 0, inputs);
                }
              });
            };

            createComputedProperty(parent);
            computedProperties.push({
              key: key,
              parentPath: parentPath,
              createComputedProperty: createComputedProperty
            });
          } else if (value[reducerSymbol]) {
            customReducers.push({
              key: key,
              parentPath: parentPath,
              reducer: value
            });
          } else {
            handleValueAsState();
          }
        } else if (isStateObject(value)) {
          var existing = get$2(path, defaultState);

          if (existing == null) {
            set$2(path, defaultState, {});
          }

          recursiveExtractDefsFromModel(value, path);
        } else {
          handleValueAsState();
        }
      });
    };

    recursiveExtractDefsFromModel(model, []);
    listenerDefinitions.forEach(function (listenerActionOrThunk) {
      var listenerMeta = listenerActionOrThunk[actionOnSymbol] || listenerActionOrThunk[thunkOnSymbol];
      var targets = listenerMeta.targetResolver(get$2(listenerMeta.parent, actionCreators), actionCreators);
      var targetTypes = (Array.isArray(targets) ? targets : [targets]).reduce(function (acc, target) {
        if (typeof target === 'function' && target.type && actionCreatorDict[target.type]) {
          acc.push(target.type);
        } else if (typeof target === 'string') {
          acc.push(target);
        }

        return acc;
      }, []);
      listenerMeta.resolvedTargets = targetTypes;
      targetTypes.forEach(function (targetType) {
        var listenerReg = listenerActionMap[targetType] || [];
        listenerReg.push(actionCreatorDict[listenerMeta.type]);
        listenerActionMap[targetType] = listenerReg;
      });
    });

    var createReducer = function createReducer() {
      var runActionReducerAtPath = function runActionReducerAtPath(state, action, actionReducer, path) {
        return simpleProduce(path, state, function (draft) {
          return actionReducer(draft, action.payload);
        });
      };

      var reducerForActions = function reducerForActions(state, action) {
        var actionReducer = actionReducersDict[action.type];

        if (actionReducer) {
          var actionMeta = actionReducer[actionSymbol] || actionReducer[actionOnSymbol];
          return runActionReducerAtPath(state, action, actionReducer, actionMeta.parent);
        }

        return state;
      };

      var reducerForCustomReducers = function reducerForCustomReducers(state, action) {
        return customReducers.reduce(function (acc, _ref2) {
          var parentPath = _ref2.parentPath,
              key = _ref2.key,
              red = _ref2.reducer;
          return simpleProduce(parentPath, acc, function (draft) {
            draft[key] = red(draft[key], action);
            return draft;
          });
        }, state);
      };

      var rootReducer = function rootReducer(state, action) {
        var stateAfterActions = reducerForActions(state, action);
        var next = customReducers.length > 0 ? reducerForCustomReducers(stateAfterActions, action) : stateAfterActions;

        if (state !== next) {
          computedProperties.forEach(function (_ref3) {
            var parentPath = _ref3.parentPath,
                createComputedProperty = _ref3.createComputedProperty;
            createComputedProperty(get$2(parentPath, next));
          });
        }

        return next;
      };

      return rootReducer;
    };

    return {
      actionCreatorDict: actionCreatorDict,
      actionCreators: actionCreators,
      computedProperties: computedProperties,
      computedState: computedState,
      defaultState: defaultState,
      listenerActionCreators: listenerActionCreators,
      listenerActionMap: listenerActionMap,
      reducer: reducerEnhancer(createReducer())
    };
  }

  function createStore$1(model, options) {
    if (options === void 0) {
      options = {};
    }

    var _options = options,
        compose$1 = _options.compose,
        _options$devTools = _options.devTools,
        devTools = _options$devTools === void 0 ? true : _options$devTools,
        _options$disableImmer = _options.disableImmer,
        disableImmer = _options$disableImmer === void 0 ? false : _options$disableImmer,
        _options$enhancers = _options.enhancers,
        enhancers = _options$enhancers === void 0 ? [] : _options$enhancers,
        _options$initialState = _options.initialState,
        initialState = _options$initialState === void 0 ? {} : _options$initialState,
        injections = _options.injections,
        _options$middleware = _options.middleware,
        middleware = _options$middleware === void 0 ? [] : _options$middleware,
        _options$mockActions = _options.mockActions,
        mockActions = _options$mockActions === void 0 ? false : _options$mockActions,
        _options$name = _options.name,
        storeName = _options$name === void 0 ? "EasyPeasyStore" : _options$name,
        _options$reducerEnhan = _options.reducerEnhancer,
        reducerEnhancer = _options$reducerEnhan === void 0 ? function (rootReducer) {
      return rootReducer;
    } : _options$reducerEnhan;

    var bindReplaceState = function bindReplaceState(modelDef) {
      return _extends({}, modelDef, {
        easyPeasyReplaceState: action(function (state, payload) {
          return payload;
        })
      });
    };

    var modelDefinition = bindReplaceState(model);
    var mockedActions = [];
    var references = {};

    var bindStoreInternals = function bindStoreInternals(state) {
      if (state === void 0) {
        state = {};
      }

      references.internals = createStoreInternals({
        disableImmer: disableImmer,
        initialState: state,
        injections: injections,
        model: modelDefinition,
        reducerEnhancer: reducerEnhancer,
        references: references
      });
    };

    bindStoreInternals(initialState);

    var listenerActionsMiddleware = function listenerActionsMiddleware() {
      return function (next) {
        return function (action) {
          var result = next(action);

          if (action && references.internals.listenerActionMap[action.type] && references.internals.listenerActionMap[action.type].length > 0) {
            var sourceAction = references.internals.actionCreatorDict[action.type];
            references.internals.listenerActionMap[action.type].forEach(function (actionCreator) {
              actionCreator({
                type: sourceAction ? sourceAction.type : action.type,
                payload: action.payload,
                error: action.error,
                result: action.result
              });
            });
          }

          return result;
        };
      };
    };

    var mockActionsMiddleware = function mockActionsMiddleware() {
      return function () {
        return function (action) {
          if (action != null) {
            mockedActions.push(action);
          }

          return undefined;
        };
      };
    };

    var computedPropertiesMiddleware = function computedPropertiesMiddleware(store) {
      return function (next) {
        return function (action) {
          references.internals.computedState.currentState = store.getState();
          references.internals.computedState.isInReducer = true;
          return next(action);
        };
      };
    };

    var easyPeasyMiddleware = [computedPropertiesMiddleware, thunk].concat(middleware, [listenerActionsMiddleware]);

    if (mockActions) {
      easyPeasyMiddleware.push(mockActionsMiddleware);
    }

    var composeEnhancers = compose$1 || (devTools && typeof window !== 'undefined' && window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__({
      name: storeName
    }) : compose);
    var store = createStore(references.internals.reducer, references.internals.defaultState, composeEnhancers.apply(void 0, [applyMiddleware.apply(void 0, easyPeasyMiddleware)].concat(enhancers)));
    store.subscribe(function () {
      references.internals.computedState.isInReducer = false;
    });
    references.dispatch = store.dispatch;
    references.getState = store.getState;

    var bindActionCreators = function bindActionCreators() {
      Object.keys(store.dispatch).forEach(function (actionsKey) {
        delete store.dispatch[actionsKey];
      });
      Object.keys(references.internals.actionCreators).forEach(function (key) {
        store.dispatch[key] = references.internals.actionCreators[key];
      });
    };

    bindActionCreators();

    var rebindStore = function rebindStore(removeKey) {
      var currentState = store.getState();

      if (removeKey) {
        delete currentState[removeKey];
      }

      bindStoreInternals(store.getState());
      store.replaceReducer(references.internals.reducer);
      references.internals.actionCreatorDict['@action.easyPeasyReplaceState'](references.internals.defaultState);
      bindActionCreators();
    };

    return Object.assign(store, {
      addModel: function addModel(key, modelForKey) {
        if (modelDefinition[key] && process.env.NODE_ENV !== 'production') {
          // eslint-disable-next-line no-console
          console.warn("easy-peasy: The store model already contains a model definition for \"" + key + "\"");
          store.removeModel(key);
        }

        modelDefinition[key] = modelForKey;
        rebindStore();
      },
      clearMockedActions: function clearMockedActions() {
        mockedActions = [];
      },
      getActions: function getActions() {
        return references.internals.actionCreators;
      },
      getListeners: function getListeners() {
        return references.internals.listenerActionCreators;
      },
      getMockedActions: function getMockedActions() {
        return [].concat(mockedActions);
      },
      reconfigure: function reconfigure(newModel) {
        modelDefinition = bindReplaceState(newModel);
        rebindStore();
      },
      removeModel: function removeModel(key) {
        if (!modelDefinition[key]) {
          if (process.env.NODE_ENV !== 'production') {
            // eslint-disable-next-line no-console
            console.warn("easy-peasy: The store model does not contain a model definition for \"" + key + "\"");
          }

          return;
        }

        delete modelDefinition[key];
        rebindStore(key);
      }
    });
  }

  var StoreProvider = function StoreProvider(_ref) {
    var children = _ref.children,
        store = _ref.store;
    return React__default.createElement(StoreContext.Provider, {
      value: store
    }, children);
  };

  /**
   * The auto freeze feature of immer doesn't seem to work in our testing. We have
   * explicitly disabled it to avoid perf issues.
   */

  setAutoFreeze(false);

  function _defineProperty$1(obj, key, value) {
    if (key in obj) {
      Object.defineProperty(obj, key, {
        value: value,
        enumerable: true,
        configurable: true,
        writable: true
      });
    } else {
      obj[key] = value;
    }

    return obj;
  }

  function _extends$1() {
    _extends$1 = Object.assign || function (target) {
      for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i];

        for (var key in source) {
          if (Object.prototype.hasOwnProperty.call(source, key)) {
            target[key] = source[key];
          }
        }
      }

      return target;
    };

    return _extends$1.apply(this, arguments);
  }

  function ownKeys$2(object, enumerableOnly) {
    var keys = Object.keys(object);

    if (Object.getOwnPropertySymbols) {
      var symbols = Object.getOwnPropertySymbols(object);
      if (enumerableOnly) symbols = symbols.filter(function (sym) {
        return Object.getOwnPropertyDescriptor(object, sym).enumerable;
      });
      keys.push.apply(keys, symbols);
    }

    return keys;
  }

  function _objectSpread2$1(target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i] != null ? arguments[i] : {};

      if (i % 2) {
        ownKeys$2(source, true).forEach(function (key) {
          _defineProperty$1(target, key, source[key]);
        });
      } else if (Object.getOwnPropertyDescriptors) {
        Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
      } else {
        ownKeys$2(source).forEach(function (key) {
          Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
        });
      }
    }

    return target;
  }

  function _objectWithoutPropertiesLoose(source, excluded) {
    if (source == null) return {};
    var target = {};
    var sourceKeys = Object.keys(source);
    var key, i;

    for (i = 0; i < sourceKeys.length; i++) {
      key = sourceKeys[i];
      if (excluded.indexOf(key) >= 0) continue;
      target[key] = source[key];
    }

    return target;
  }

  function _objectWithoutProperties(source, excluded) {
    if (source == null) return {};

    var target = _objectWithoutPropertiesLoose(source, excluded);

    var key, i;

    if (Object.getOwnPropertySymbols) {
      var sourceSymbolKeys = Object.getOwnPropertySymbols(source);

      for (i = 0; i < sourceSymbolKeys.length; i++) {
        key = sourceSymbolKeys[i];
        if (excluded.indexOf(key) >= 0) continue;
        if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
        target[key] = source[key];
      }
    }

    return target;
  }

  function _slicedToArray(arr, i) {
    return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest();
  }

  function _toConsumableArray(arr) {
    return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
  }

  function _arrayWithoutHoles(arr) {
    if (Array.isArray(arr)) {
      for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];

      return arr2;
    }
  }

  function _arrayWithHoles(arr) {
    if (Array.isArray(arr)) return arr;
  }

  function _iterableToArray(iter) {
    if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
  }

  function _iterableToArrayLimit(arr, i) {
    if (!(Symbol.iterator in Object(arr) || Object.prototype.toString.call(arr) === "[object Arguments]")) {
      return;
    }

    var _arr = [];
    var _n = true;
    var _d = false;
    var _e = undefined;

    try {
      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
        _arr.push(_s.value);

        if (i && _arr.length === i) break;
      }
    } catch (err) {
      _d = true;
      _e = err;
    } finally {
      try {
        if (!_n && _i["return"] != null) _i["return"]();
      } finally {
        if (_d) throw _e;
      }
    }

    return _arr;
  }

  function _nonIterableSpread() {
    throw new TypeError("Invalid attempt to spread non-iterable instance");
  }

  function _nonIterableRest() {
    throw new TypeError("Invalid attempt to destructure non-iterable instance");
  }

  var noop = {value: function() {}};

  function dispatch() {
    for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {
      if (!(t = arguments[i] + "") || (t in _)) throw new Error("illegal type: " + t);
      _[t] = [];
    }
    return new Dispatch(_);
  }

  function Dispatch(_) {
    this._ = _;
  }

  function parseTypenames(typenames, types) {
    return typenames.trim().split(/^|\s+/).map(function(t) {
      var name = "", i = t.indexOf(".");
      if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
      if (t && !types.hasOwnProperty(t)) throw new Error("unknown type: " + t);
      return {type: t, name: name};
    });
  }

  Dispatch.prototype = dispatch.prototype = {
    constructor: Dispatch,
    on: function(typename, callback) {
      var _ = this._,
          T = parseTypenames(typename + "", _),
          t,
          i = -1,
          n = T.length;

      // If no callback was specified, return the callback of the given type and name.
      if (arguments.length < 2) {
        while (++i < n) if ((t = (typename = T[i]).type) && (t = get$3(_[t], typename.name))) return t;
        return;
      }

      // If a type was specified, set the callback for the given type and name.
      // Otherwise, if a null callback was specified, remove callbacks of the given name.
      if (callback != null && typeof callback !== "function") throw new Error("invalid callback: " + callback);
      while (++i < n) {
        if (t = (typename = T[i]).type) _[t] = set$3(_[t], typename.name, callback);
        else if (callback == null) for (t in _) _[t] = set$3(_[t], typename.name, null);
      }

      return this;
    },
    copy: function() {
      var copy = {}, _ = this._;
      for (var t in _) copy[t] = _[t].slice();
      return new Dispatch(copy);
    },
    call: function(type, that) {
      if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];
      if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
      for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
    },
    apply: function(type, that, args) {
      if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
      for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
    }
  };

  function get$3(type, name) {
    for (var i = 0, n = type.length, c; i < n; ++i) {
      if ((c = type[i]).name === name) {
        return c.value;
      }
    }
  }

  function set$3(type, name, callback) {
    for (var i = 0, n = type.length; i < n; ++i) {
      if (type[i].name === name) {
        type[i] = noop, type = type.slice(0, i).concat(type.slice(i + 1));
        break;
      }
    }
    if (callback != null) type.push({name: name, value: callback});
    return type;
  }

  var xhtml = "http://www.w3.org/1999/xhtml";

  var namespaces = {
    svg: "http://www.w3.org/2000/svg",
    xhtml: xhtml,
    xlink: "http://www.w3.org/1999/xlink",
    xml: "http://www.w3.org/XML/1998/namespace",
    xmlns: "http://www.w3.org/2000/xmlns/"
  };

  function namespace(name) {
    var prefix = name += "", i = prefix.indexOf(":");
    if (i >= 0 && (prefix = name.slice(0, i)) !== "xmlns") name = name.slice(i + 1);
    return namespaces.hasOwnProperty(prefix) ? {space: namespaces[prefix], local: name} : name;
  }

  function creatorInherit(name) {
    return function() {
      var document = this.ownerDocument,
          uri = this.namespaceURI;
      return uri === xhtml && document.documentElement.namespaceURI === xhtml
          ? document.createElement(name)
          : document.createElementNS(uri, name);
    };
  }

  function creatorFixed(fullname) {
    return function() {
      return this.ownerDocument.createElementNS(fullname.space, fullname.local);
    };
  }

  function creator(name) {
    var fullname = namespace(name);
    return (fullname.local
        ? creatorFixed
        : creatorInherit)(fullname);
  }

  function none() {}

  function selector(selector) {
    return selector == null ? none : function() {
      return this.querySelector(selector);
    };
  }

  function selection_select(select) {
    if (typeof select !== "function") select = selector(select);

    for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
        if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
          if ("__data__" in node) subnode.__data__ = node.__data__;
          subgroup[i] = subnode;
        }
      }
    }

    return new Selection(subgroups, this._parents);
  }

  function empty() {
    return [];
  }

  function selectorAll(selector) {
    return selector == null ? empty : function() {
      return this.querySelectorAll(selector);
    };
  }

  function selection_selectAll(select) {
    if (typeof select !== "function") select = selectorAll(select);

    for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
        if (node = group[i]) {
          subgroups.push(select.call(node, node.__data__, i, group));
          parents.push(node);
        }
      }
    }

    return new Selection(subgroups, parents);
  }

  function matcher(selector) {
    return function() {
      return this.matches(selector);
    };
  }

  function selection_filter(match) {
    if (typeof match !== "function") match = matcher(match);

    for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
        if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
          subgroup.push(node);
        }
      }
    }

    return new Selection(subgroups, this._parents);
  }

  function sparse(update) {
    return new Array(update.length);
  }

  function selection_enter() {
    return new Selection(this._enter || this._groups.map(sparse), this._parents);
  }

  function EnterNode(parent, datum) {
    this.ownerDocument = parent.ownerDocument;
    this.namespaceURI = parent.namespaceURI;
    this._next = null;
    this._parent = parent;
    this.__data__ = datum;
  }

  EnterNode.prototype = {
    constructor: EnterNode,
    appendChild: function(child) { return this._parent.insertBefore(child, this._next); },
    insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },
    querySelector: function(selector) { return this._parent.querySelector(selector); },
    querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }
  };

  function constant(x) {
    return function() {
      return x;
    };
  }

  var keyPrefix = "$"; // Protect against keys like “__proto__”.

  function bindIndex(parent, group, enter, update, exit, data) {
    var i = 0,
        node,
        groupLength = group.length,
        dataLength = data.length;

    // Put any non-null nodes that fit into update.
    // Put any null nodes into enter.
    // Put any remaining data into enter.
    for (; i < dataLength; ++i) {
      if (node = group[i]) {
        node.__data__ = data[i];
        update[i] = node;
      } else {
        enter[i] = new EnterNode(parent, data[i]);
      }
    }

    // Put any non-null nodes that don’t fit into exit.
    for (; i < groupLength; ++i) {
      if (node = group[i]) {
        exit[i] = node;
      }
    }
  }

  function bindKey(parent, group, enter, update, exit, data, key) {
    var i,
        node,
        nodeByKeyValue = {},
        groupLength = group.length,
        dataLength = data.length,
        keyValues = new Array(groupLength),
        keyValue;

    // Compute the key for each node.
    // If multiple nodes have the same key, the duplicates are added to exit.
    for (i = 0; i < groupLength; ++i) {
      if (node = group[i]) {
        keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);
        if (keyValue in nodeByKeyValue) {
          exit[i] = node;
        } else {
          nodeByKeyValue[keyValue] = node;
        }
      }
    }

    // Compute the key for each datum.
    // If there a node associated with this key, join and add it to update.
    // If there is not (or the key is a duplicate), add it to enter.
    for (i = 0; i < dataLength; ++i) {
      keyValue = keyPrefix + key.call(parent, data[i], i, data);
      if (node = nodeByKeyValue[keyValue]) {
        update[i] = node;
        node.__data__ = data[i];
        nodeByKeyValue[keyValue] = null;
      } else {
        enter[i] = new EnterNode(parent, data[i]);
      }
    }

    // Add any remaining nodes that were not bound to data to exit.
    for (i = 0; i < groupLength; ++i) {
      if ((node = group[i]) && (nodeByKeyValue[keyValues[i]] === node)) {
        exit[i] = node;
      }
    }
  }

  function selection_data(value, key) {
    if (!value) {
      data = new Array(this.size()), j = -1;
      this.each(function(d) { data[++j] = d; });
      return data;
    }

    var bind = key ? bindKey : bindIndex,
        parents = this._parents,
        groups = this._groups;

    if (typeof value !== "function") value = constant(value);

    for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {
      var parent = parents[j],
          group = groups[j],
          groupLength = group.length,
          data = value.call(parent, parent && parent.__data__, j, parents),
          dataLength = data.length,
          enterGroup = enter[j] = new Array(dataLength),
          updateGroup = update[j] = new Array(dataLength),
          exitGroup = exit[j] = new Array(groupLength);

      bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);

      // Now connect the enter nodes to their following update node, such that
      // appendChild can insert the materialized enter node before this node,
      // rather than at the end of the parent node.
      for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {
        if (previous = enterGroup[i0]) {
          if (i0 >= i1) i1 = i0 + 1;
          while (!(next = updateGroup[i1]) && ++i1 < dataLength);
          previous._next = next || null;
        }
      }
    }

    update = new Selection(update, parents);
    update._enter = enter;
    update._exit = exit;
    return update;
  }

  function selection_exit() {
    return new Selection(this._exit || this._groups.map(sparse), this._parents);
  }

  function selection_join(onenter, onupdate, onexit) {
    var enter = this.enter(), update = this, exit = this.exit();
    enter = typeof onenter === "function" ? onenter(enter) : enter.append(onenter + "");
    if (onupdate != null) update = onupdate(update);
    if (onexit == null) exit.remove(); else onexit(exit);
    return enter && update ? enter.merge(update).order() : update;
  }

  function selection_merge(selection) {

    for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
      for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
        if (node = group0[i] || group1[i]) {
          merge[i] = node;
        }
      }
    }

    for (; j < m0; ++j) {
      merges[j] = groups0[j];
    }

    return new Selection(merges, this._parents);
  }

  function selection_order() {

    for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {
      for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
        if (node = group[i]) {
          if (next && node.compareDocumentPosition(next) ^ 4) next.parentNode.insertBefore(node, next);
          next = node;
        }
      }
    }

    return this;
  }

  function selection_sort(compare) {
    if (!compare) compare = ascending;

    function compareNode(a, b) {
      return a && b ? compare(a.__data__, b.__data__) : !a - !b;
    }

    for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
        if (node = group[i]) {
          sortgroup[i] = node;
        }
      }
      sortgroup.sort(compareNode);
    }

    return new Selection(sortgroups, this._parents).order();
  }

  function ascending(a, b) {
    return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
  }

  function selection_call() {
    var callback = arguments[0];
    arguments[0] = this;
    callback.apply(null, arguments);
    return this;
  }

  function selection_nodes() {
    var nodes = new Array(this.size()), i = -1;
    this.each(function() { nodes[++i] = this; });
    return nodes;
  }

  function selection_node() {

    for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
      for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
        var node = group[i];
        if (node) return node;
      }
    }

    return null;
  }

  function selection_size() {
    var size = 0;
    this.each(function() { ++size; });
    return size;
  }

  function selection_empty() {
    return !this.node();
  }

  function selection_each(callback) {

    for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
      for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {
        if (node = group[i]) callback.call(node, node.__data__, i, group);
      }
    }

    return this;
  }

  function attrRemove(name) {
    return function() {
      this.removeAttribute(name);
    };
  }

  function attrRemoveNS(fullname) {
    return function() {
      this.removeAttributeNS(fullname.space, fullname.local);
    };
  }

  function attrConstant(name, value) {
    return function() {
      this.setAttribute(name, value);
    };
  }

  function attrConstantNS(fullname, value) {
    return function() {
      this.setAttributeNS(fullname.space, fullname.local, value);
    };
  }

  function attrFunction(name, value) {
    return function() {
      var v = value.apply(this, arguments);
      if (v == null) this.removeAttribute(name);
      else this.setAttribute(name, v);
    };
  }

  function attrFunctionNS(fullname, value) {
    return function() {
      var v = value.apply(this, arguments);
      if (v == null) this.removeAttributeNS(fullname.space, fullname.local);
      else this.setAttributeNS(fullname.space, fullname.local, v);
    };
  }

  function selection_attr(name, value) {
    var fullname = namespace(name);

    if (arguments.length < 2) {
      var node = this.node();
      return fullname.local
          ? node.getAttributeNS(fullname.space, fullname.local)
          : node.getAttribute(fullname);
    }

    return this.each((value == null
        ? (fullname.local ? attrRemoveNS : attrRemove) : (typeof value === "function"
        ? (fullname.local ? attrFunctionNS : attrFunction)
        : (fullname.local ? attrConstantNS : attrConstant)))(fullname, value));
  }

  function defaultView(node) {
    return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node
        || (node.document && node) // node is a Window
        || node.defaultView; // node is a Document
  }

  function styleRemove(name) {
    return function() {
      this.style.removeProperty(name);
    };
  }

  function styleConstant(name, value, priority) {
    return function() {
      this.style.setProperty(name, value, priority);
    };
  }

  function styleFunction(name, value, priority) {
    return function() {
      var v = value.apply(this, arguments);
      if (v == null) this.style.removeProperty(name);
      else this.style.setProperty(name, v, priority);
    };
  }

  function selection_style(name, value, priority) {
    return arguments.length > 1
        ? this.each((value == null
              ? styleRemove : typeof value === "function"
              ? styleFunction
              : styleConstant)(name, value, priority == null ? "" : priority))
        : styleValue(this.node(), name);
  }

  function styleValue(node, name) {
    return node.style.getPropertyValue(name)
        || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);
  }

  function propertyRemove(name) {
    return function() {
      delete this[name];
    };
  }

  function propertyConstant(name, value) {
    return function() {
      this[name] = value;
    };
  }

  function propertyFunction(name, value) {
    return function() {
      var v = value.apply(this, arguments);
      if (v == null) delete this[name];
      else this[name] = v;
    };
  }

  function selection_property(name, value) {
    return arguments.length > 1
        ? this.each((value == null
            ? propertyRemove : typeof value === "function"
            ? propertyFunction
            : propertyConstant)(name, value))
        : this.node()[name];
  }

  function classArray(string) {
    return string.trim().split(/^|\s+/);
  }

  function classList(node) {
    return node.classList || new ClassList(node);
  }

  function ClassList(node) {
    this._node = node;
    this._names = classArray(node.getAttribute("class") || "");
  }

  ClassList.prototype = {
    add: function(name) {
      var i = this._names.indexOf(name);
      if (i < 0) {
        this._names.push(name);
        this._node.setAttribute("class", this._names.join(" "));
      }
    },
    remove: function(name) {
      var i = this._names.indexOf(name);
      if (i >= 0) {
        this._names.splice(i, 1);
        this._node.setAttribute("class", this._names.join(" "));
      }
    },
    contains: function(name) {
      return this._names.indexOf(name) >= 0;
    }
  };

  function classedAdd(node, names) {
    var list = classList(node), i = -1, n = names.length;
    while (++i < n) list.add(names[i]);
  }

  function classedRemove(node, names) {
    var list = classList(node), i = -1, n = names.length;
    while (++i < n) list.remove(names[i]);
  }

  function classedTrue(names) {
    return function() {
      classedAdd(this, names);
    };
  }

  function classedFalse(names) {
    return function() {
      classedRemove(this, names);
    };
  }

  function classedFunction(names, value) {
    return function() {
      (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);
    };
  }

  function selection_classed(name, value) {
    var names = classArray(name + "");

    if (arguments.length < 2) {
      var list = classList(this.node()), i = -1, n = names.length;
      while (++i < n) if (!list.contains(names[i])) return false;
      return true;
    }

    return this.each((typeof value === "function"
        ? classedFunction : value
        ? classedTrue
        : classedFalse)(names, value));
  }

  function textRemove() {
    this.textContent = "";
  }

  function textConstant(value) {
    return function() {
      this.textContent = value;
    };
  }

  function textFunction(value) {
    return function() {
      var v = value.apply(this, arguments);
      this.textContent = v == null ? "" : v;
    };
  }

  function selection_text(value) {
    return arguments.length
        ? this.each(value == null
            ? textRemove : (typeof value === "function"
            ? textFunction
            : textConstant)(value))
        : this.node().textContent;
  }

  function htmlRemove() {
    this.innerHTML = "";
  }

  function htmlConstant(value) {
    return function() {
      this.innerHTML = value;
    };
  }

  function htmlFunction(value) {
    return function() {
      var v = value.apply(this, arguments);
      this.innerHTML = v == null ? "" : v;
    };
  }

  function selection_html(value) {
    return arguments.length
        ? this.each(value == null
            ? htmlRemove : (typeof value === "function"
            ? htmlFunction
            : htmlConstant)(value))
        : this.node().innerHTML;
  }

  function raise() {
    if (this.nextSibling) this.parentNode.appendChild(this);
  }

  function selection_raise() {
    return this.each(raise);
  }

  function lower() {
    if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
  }

  function selection_lower() {
    return this.each(lower);
  }

  function selection_append(name) {
    var create = typeof name === "function" ? name : creator(name);
    return this.select(function() {
      return this.appendChild(create.apply(this, arguments));
    });
  }

  function constantNull() {
    return null;
  }

  function selection_insert(name, before) {
    var create = typeof name === "function" ? name : creator(name),
        select = before == null ? constantNull : typeof before === "function" ? before : selector(before);
    return this.select(function() {
      return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);
    });
  }

  function remove() {
    var parent = this.parentNode;
    if (parent) parent.removeChild(this);
  }

  function selection_remove() {
    return this.each(remove);
  }

  function selection_cloneShallow() {
    return this.parentNode.insertBefore(this.cloneNode(false), this.nextSibling);
  }

  function selection_cloneDeep() {
    return this.parentNode.insertBefore(this.cloneNode(true), this.nextSibling);
  }

  function selection_clone(deep) {
    return this.select(deep ? selection_cloneDeep : selection_cloneShallow);
  }

  function selection_datum(value) {
    return arguments.length
        ? this.property("__data__", value)
        : this.node().__data__;
  }

  var filterEvents = {};

  var event = null;

  if (typeof document !== "undefined") {
    var element = document.documentElement;
    if (!("onmouseenter" in element)) {
      filterEvents = {mouseenter: "mouseover", mouseleave: "mouseout"};
    }
  }

  function filterContextListener(listener, index, group) {
    listener = contextListener(listener, index, group);
    return function(event) {
      var related = event.relatedTarget;
      if (!related || (related !== this && !(related.compareDocumentPosition(this) & 8))) {
        listener.call(this, event);
      }
    };
  }

  function contextListener(listener, index, group) {
    return function(event1) {
      var event0 = event; // Events can be reentrant (e.g., focus).
      event = event1;
      try {
        listener.call(this, this.__data__, index, group);
      } finally {
        event = event0;
      }
    };
  }

  function parseTypenames$1(typenames) {
    return typenames.trim().split(/^|\s+/).map(function(t) {
      var name = "", i = t.indexOf(".");
      if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
      return {type: t, name: name};
    });
  }

  function onRemove(typename) {
    return function() {
      var on = this.__on;
      if (!on) return;
      for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {
        if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {
          this.removeEventListener(o.type, o.listener, o.capture);
        } else {
          on[++i] = o;
        }
      }
      if (++i) on.length = i;
      else delete this.__on;
    };
  }

  function onAdd(typename, value, capture) {
    var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;
    return function(d, i, group) {
      var on = this.__on, o, listener = wrap(value, i, group);
      if (on) for (var j = 0, m = on.length; j < m; ++j) {
        if ((o = on[j]).type === typename.type && o.name === typename.name) {
          this.removeEventListener(o.type, o.listener, o.capture);
          this.addEventListener(o.type, o.listener = listener, o.capture = capture);
          o.value = value;
          return;
        }
      }
      this.addEventListener(typename.type, listener, capture);
      o = {type: typename.type, name: typename.name, value: value, listener: listener, capture: capture};
      if (!on) this.__on = [o];
      else on.push(o);
    };
  }

  function selection_on(typename, value, capture) {
    var typenames = parseTypenames$1(typename + ""), i, n = typenames.length, t;

    if (arguments.length < 2) {
      var on = this.node().__on;
      if (on) for (var j = 0, m = on.length, o; j < m; ++j) {
        for (i = 0, o = on[j]; i < n; ++i) {
          if ((t = typenames[i]).type === o.type && t.name === o.name) {
            return o.value;
          }
        }
      }
      return;
    }

    on = value ? onAdd : onRemove;
    if (capture == null) capture = false;
    for (i = 0; i < n; ++i) this.each(on(typenames[i], value, capture));
    return this;
  }

  function customEvent(event1, listener, that, args) {
    var event0 = event;
    event1.sourceEvent = event;
    event = event1;
    try {
      return listener.apply(that, args);
    } finally {
      event = event0;
    }
  }

  function dispatchEvent(node, type, params) {
    var window = defaultView(node),
        event = window.CustomEvent;

    if (typeof event === "function") {
      event = new event(type, params);
    } else {
      event = window.document.createEvent("Event");
      if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;
      else event.initEvent(type, false, false);
    }

    node.dispatchEvent(event);
  }

  function dispatchConstant(type, params) {
    return function() {
      return dispatchEvent(this, type, params);
    };
  }

  function dispatchFunction(type, params) {
    return function() {
      return dispatchEvent(this, type, params.apply(this, arguments));
    };
  }

  function selection_dispatch(type, params) {
    return this.each((typeof params === "function"
        ? dispatchFunction
        : dispatchConstant)(type, params));
  }

  var root$1 = [null];

  function Selection(groups, parents) {
    this._groups = groups;
    this._parents = parents;
  }

  function selection() {
    return new Selection([[document.documentElement]], root$1);
  }

  Selection.prototype = selection.prototype = {
    constructor: Selection,
    select: selection_select,
    selectAll: selection_selectAll,
    filter: selection_filter,
    data: selection_data,
    enter: selection_enter,
    exit: selection_exit,
    join: selection_join,
    merge: selection_merge,
    order: selection_order,
    sort: selection_sort,
    call: selection_call,
    nodes: selection_nodes,
    node: selection_node,
    size: selection_size,
    empty: selection_empty,
    each: selection_each,
    attr: selection_attr,
    style: selection_style,
    property: selection_property,
    classed: selection_classed,
    text: selection_text,
    html: selection_html,
    raise: selection_raise,
    lower: selection_lower,
    append: selection_append,
    insert: selection_insert,
    remove: selection_remove,
    clone: selection_clone,
    datum: selection_datum,
    on: selection_on,
    dispatch: selection_dispatch
  };

  function select(selector) {
    return typeof selector === "string"
        ? new Selection([[document.querySelector(selector)]], [document.documentElement])
        : new Selection([[selector]], root$1);
  }

  function sourceEvent() {
    var current = event, source;
    while (source = current.sourceEvent) current = source;
    return current;
  }

  function point(node, event) {
    var svg = node.ownerSVGElement || node;

    if (svg.createSVGPoint) {
      var point = svg.createSVGPoint();
      point.x = event.clientX, point.y = event.clientY;
      point = point.matrixTransform(node.getScreenCTM().inverse());
      return [point.x, point.y];
    }

    var rect = node.getBoundingClientRect();
    return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];
  }

  function mouse(node) {
    var event = sourceEvent();
    if (event.changedTouches) event = event.changedTouches[0];
    return point(node, event);
  }

  function touch(node, touches, identifier) {
    if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;

    for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {
      if ((touch = touches[i]).identifier === identifier) {
        return point(node, touch);
      }
    }

    return null;
  }

  function noevent() {
    event.preventDefault();
    event.stopImmediatePropagation();
  }

  function dragDisable(view) {
    var root = view.document.documentElement,
        selection = select(view).on("dragstart.drag", noevent, true);
    if ("onselectstart" in root) {
      selection.on("selectstart.drag", noevent, true);
    } else {
      root.__noselect = root.style.MozUserSelect;
      root.style.MozUserSelect = "none";
    }
  }

  function yesdrag(view, noclick) {
    var root = view.document.documentElement,
        selection = select(view).on("dragstart.drag", null);
    if (noclick) {
      selection.on("click.drag", noevent, true);
      setTimeout(function() { selection.on("click.drag", null); }, 0);
    }
    if ("onselectstart" in root) {
      selection.on("selectstart.drag", null);
    } else {
      root.style.MozUserSelect = root.__noselect;
      delete root.__noselect;
    }
  }

  function define(constructor, factory, prototype) {
    constructor.prototype = factory.prototype = prototype;
    prototype.constructor = constructor;
  }

  function extend(parent, definition) {
    var prototype = Object.create(parent.prototype);
    for (var key in definition) prototype[key] = definition[key];
    return prototype;
  }

  function Color() {}

  var darker = 0.7;
  var brighter = 1 / darker;

  var reI = "\\s*([+-]?\\d+)\\s*",
      reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*",
      reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*",
      reHex = /^#([0-9a-f]{3,8})$/,
      reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$"),
      reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$"),
      reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$"),
      reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$"),
      reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$"),
      reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");

  var named = {
    aliceblue: 0xf0f8ff,
    antiquewhite: 0xfaebd7,
    aqua: 0x00ffff,
    aquamarine: 0x7fffd4,
    azure: 0xf0ffff,
    beige: 0xf5f5dc,
    bisque: 0xffe4c4,
    black: 0x000000,
    blanchedalmond: 0xffebcd,
    blue: 0x0000ff,
    blueviolet: 0x8a2be2,
    brown: 0xa52a2a,
    burlywood: 0xdeb887,
    cadetblue: 0x5f9ea0,
    chartreuse: 0x7fff00,
    chocolate: 0xd2691e,
    coral: 0xff7f50,
    cornflowerblue: 0x6495ed,
    cornsilk: 0xfff8dc,
    crimson: 0xdc143c,
    cyan: 0x00ffff,
    darkblue: 0x00008b,
    darkcyan: 0x008b8b,
    darkgoldenrod: 0xb8860b,
    darkgray: 0xa9a9a9,
    darkgreen: 0x006400,
    darkgrey: 0xa9a9a9,
    darkkhaki: 0xbdb76b,
    darkmagenta: 0x8b008b,
    darkolivegreen: 0x556b2f,
    darkorange: 0xff8c00,
    darkorchid: 0x9932cc,
    darkred: 0x8b0000,
    darksalmon: 0xe9967a,
    darkseagreen: 0x8fbc8f,
    darkslateblue: 0x483d8b,
    darkslategray: 0x2f4f4f,
    darkslategrey: 0x2f4f4f,
    darkturquoise: 0x00ced1,
    darkviolet: 0x9400d3,
    deeppink: 0xff1493,
    deepskyblue: 0x00bfff,
    dimgray: 0x696969,
    dimgrey: 0x696969,
    dodgerblue: 0x1e90ff,
    firebrick: 0xb22222,
    floralwhite: 0xfffaf0,
    forestgreen: 0x228b22,
    fuchsia: 0xff00ff,
    gainsboro: 0xdcdcdc,
    ghostwhite: 0xf8f8ff,
    gold: 0xffd700,
    goldenrod: 0xdaa520,
    gray: 0x808080,
    green: 0x008000,
    greenyellow: 0xadff2f,
    grey: 0x808080,
    honeydew: 0xf0fff0,
    hotpink: 0xff69b4,
    indianred: 0xcd5c5c,
    indigo: 0x4b0082,
    ivory: 0xfffff0,
    khaki: 0xf0e68c,
    lavender: 0xe6e6fa,
    lavenderblush: 0xfff0f5,
    lawngreen: 0x7cfc00,
    lemonchiffon: 0xfffacd,
    lightblue: 0xadd8e6,
    lightcoral: 0xf08080,
    lightcyan: 0xe0ffff,
    lightgoldenrodyellow: 0xfafad2,
    lightgray: 0xd3d3d3,
    lightgreen: 0x90ee90,
    lightgrey: 0xd3d3d3,
    lightpink: 0xffb6c1,
    lightsalmon: 0xffa07a,
    lightseagreen: 0x20b2aa,
    lightskyblue: 0x87cefa,
    lightslategray: 0x778899,
    lightslategrey: 0x778899,
    lightsteelblue: 0xb0c4de,
    lightyellow: 0xffffe0,
    lime: 0x00ff00,
    limegreen: 0x32cd32,
    linen: 0xfaf0e6,
    magenta: 0xff00ff,
    maroon: 0x800000,
    mediumaquamarine: 0x66cdaa,
    mediumblue: 0x0000cd,
    mediumorchid: 0xba55d3,
    mediumpurple: 0x9370db,
    mediumseagreen: 0x3cb371,
    mediumslateblue: 0x7b68ee,
    mediumspringgreen: 0x00fa9a,
    mediumturquoise: 0x48d1cc,
    mediumvioletred: 0xc71585,
    midnightblue: 0x191970,
    mintcream: 0xf5fffa,
    mistyrose: 0xffe4e1,
    moccasin: 0xffe4b5,
    navajowhite: 0xffdead,
    navy: 0x000080,
    oldlace: 0xfdf5e6,
    olive: 0x808000,
    olivedrab: 0x6b8e23,
    orange: 0xffa500,
    orangered: 0xff4500,
    orchid: 0xda70d6,
    palegoldenrod: 0xeee8aa,
    palegreen: 0x98fb98,
    paleturquoise: 0xafeeee,
    palevioletred: 0xdb7093,
    papayawhip: 0xffefd5,
    peachpuff: 0xffdab9,
    peru: 0xcd853f,
    pink: 0xffc0cb,
    plum: 0xdda0dd,
    powderblue: 0xb0e0e6,
    purple: 0x800080,
    rebeccapurple: 0x663399,
    red: 0xff0000,
    rosybrown: 0xbc8f8f,
    royalblue: 0x4169e1,
    saddlebrown: 0x8b4513,
    salmon: 0xfa8072,
    sandybrown: 0xf4a460,
    seagreen: 0x2e8b57,
    seashell: 0xfff5ee,
    sienna: 0xa0522d,
    silver: 0xc0c0c0,
    skyblue: 0x87ceeb,
    slateblue: 0x6a5acd,
    slategray: 0x708090,
    slategrey: 0x708090,
    snow: 0xfffafa,
    springgreen: 0x00ff7f,
    steelblue: 0x4682b4,
    tan: 0xd2b48c,
    teal: 0x008080,
    thistle: 0xd8bfd8,
    tomato: 0xff6347,
    turquoise: 0x40e0d0,
    violet: 0xee82ee,
    wheat: 0xf5deb3,
    white: 0xffffff,
    whitesmoke: 0xf5f5f5,
    yellow: 0xffff00,
    yellowgreen: 0x9acd32
  };

  define(Color, color, {
    copy: function(channels) {
      return Object.assign(new this.constructor, this, channels);
    },
    displayable: function() {
      return this.rgb().displayable();
    },
    hex: color_formatHex, // Deprecated! Use color.formatHex.
    formatHex: color_formatHex,
    formatHsl: color_formatHsl,
    formatRgb: color_formatRgb,
    toString: color_formatRgb
  });

  function color_formatHex() {
    return this.rgb().formatHex();
  }

  function color_formatHsl() {
    return hslConvert(this).formatHsl();
  }

  function color_formatRgb() {
    return this.rgb().formatRgb();
  }

  function color(format) {
    var m, l;
    format = (format + "").trim().toLowerCase();
    return (m = reHex.exec(format)) ? (l = m[1].length, m = parseInt(m[1], 16), l === 6 ? rgbn(m) // #ff0000
        : l === 3 ? new Rgb((m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1) // #f00
        : l === 8 ? new Rgb(m >> 24 & 0xff, m >> 16 & 0xff, m >> 8 & 0xff, (m & 0xff) / 0xff) // #ff000000
        : l === 4 ? new Rgb((m >> 12 & 0xf) | (m >> 8 & 0xf0), (m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), (((m & 0xf) << 4) | (m & 0xf)) / 0xff) // #f000
        : null) // invalid hex
        : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
        : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
        : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
        : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
        : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
        : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
        : named.hasOwnProperty(format) ? rgbn(named[format]) // eslint-disable-line no-prototype-builtins
        : format === "transparent" ? new Rgb(NaN, NaN, NaN, 0)
        : null;
  }

  function rgbn(n) {
    return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
  }

  function rgba(r, g, b, a) {
    if (a <= 0) r = g = b = NaN;
    return new Rgb(r, g, b, a);
  }

  function rgbConvert(o) {
    if (!(o instanceof Color)) o = color(o);
    if (!o) return new Rgb;
    o = o.rgb();
    return new Rgb(o.r, o.g, o.b, o.opacity);
  }

  function rgb(r, g, b, opacity) {
    return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
  }

  function Rgb(r, g, b, opacity) {
    this.r = +r;
    this.g = +g;
    this.b = +b;
    this.opacity = +opacity;
  }

  define(Rgb, rgb, extend(Color, {
    brighter: function(k) {
      k = k == null ? brighter : Math.pow(brighter, k);
      return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
    },
    darker: function(k) {
      k = k == null ? darker : Math.pow(darker, k);
      return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
    },
    rgb: function() {
      return this;
    },
    displayable: function() {
      return (-0.5 <= this.r && this.r < 255.5)
          && (-0.5 <= this.g && this.g < 255.5)
          && (-0.5 <= this.b && this.b < 255.5)
          && (0 <= this.opacity && this.opacity <= 1);
    },
    hex: rgb_formatHex, // Deprecated! Use color.formatHex.
    formatHex: rgb_formatHex,
    formatRgb: rgb_formatRgb,
    toString: rgb_formatRgb
  }));

  function rgb_formatHex() {
    return "#" + hex(this.r) + hex(this.g) + hex(this.b);
  }

  function rgb_formatRgb() {
    var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
    return (a === 1 ? "rgb(" : "rgba(")
        + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", "
        + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", "
        + Math.max(0, Math.min(255, Math.round(this.b) || 0))
        + (a === 1 ? ")" : ", " + a + ")");
  }

  function hex(value) {
    value = Math.max(0, Math.min(255, Math.round(value) || 0));
    return (value < 16 ? "0" : "") + value.toString(16);
  }

  function hsla(h, s, l, a) {
    if (a <= 0) h = s = l = NaN;
    else if (l <= 0 || l >= 1) h = s = NaN;
    else if (s <= 0) h = NaN;
    return new Hsl(h, s, l, a);
  }

  function hslConvert(o) {
    if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
    if (!(o instanceof Color)) o = color(o);
    if (!o) return new Hsl;
    if (o instanceof Hsl) return o;
    o = o.rgb();
    var r = o.r / 255,
        g = o.g / 255,
        b = o.b / 255,
        min = Math.min(r, g, b),
        max = Math.max(r, g, b),
        h = NaN,
        s = max - min,
        l = (max + min) / 2;
    if (s) {
      if (r === max) h = (g - b) / s + (g < b) * 6;
      else if (g === max) h = (b - r) / s + 2;
      else h = (r - g) / s + 4;
      s /= l < 0.5 ? max + min : 2 - max - min;
      h *= 60;
    } else {
      s = l > 0 && l < 1 ? 0 : h;
    }
    return new Hsl(h, s, l, o.opacity);
  }

  function hsl(h, s, l, opacity) {
    return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
  }

  function Hsl(h, s, l, opacity) {
    this.h = +h;
    this.s = +s;
    this.l = +l;
    this.opacity = +opacity;
  }

  define(Hsl, hsl, extend(Color, {
    brighter: function(k) {
      k = k == null ? brighter : Math.pow(brighter, k);
      return new Hsl(this.h, this.s, this.l * k, this.opacity);
    },
    darker: function(k) {
      k = k == null ? darker : Math.pow(darker, k);
      return new Hsl(this.h, this.s, this.l * k, this.opacity);
    },
    rgb: function() {
      var h = this.h % 360 + (this.h < 0) * 360,
          s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
          l = this.l,
          m2 = l + (l < 0.5 ? l : 1 - l) * s,
          m1 = 2 * l - m2;
      return new Rgb(
        hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
        hsl2rgb(h, m1, m2),
        hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),
        this.opacity
      );
    },
    displayable: function() {
      return (0 <= this.s && this.s <= 1 || isNaN(this.s))
          && (0 <= this.l && this.l <= 1)
          && (0 <= this.opacity && this.opacity <= 1);
    },
    formatHsl: function() {
      var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
      return (a === 1 ? "hsl(" : "hsla(")
          + (this.h || 0) + ", "
          + (this.s || 0) * 100 + "%, "
          + (this.l || 0) * 100 + "%"
          + (a === 1 ? ")" : ", " + a + ")");
    }
  }));

  /* From FvD 13.37, CSS Color Module Level 3 */
  function hsl2rgb(h, m1, m2) {
    return (h < 60 ? m1 + (m2 - m1) * h / 60
        : h < 180 ? m2
        : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
        : m1) * 255;
  }

  function constant$1(x) {
    return function() {
      return x;
    };
  }

  function linear(a, d) {
    return function(t) {
      return a + t * d;
    };
  }

  function exponential(a, b, y) {
    return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {
      return Math.pow(a + t * b, y);
    };
  }

  function gamma(y) {
    return (y = +y) === 1 ? nogamma : function(a, b) {
      return b - a ? exponential(a, b, y) : constant$1(isNaN(a) ? b : a);
    };
  }

  function nogamma(a, b) {
    var d = b - a;
    return d ? linear(a, d) : constant$1(isNaN(a) ? b : a);
  }

  var interpolateRgb = (function rgbGamma(y) {
    var color = gamma(y);

    function rgb$1(start, end) {
      var r = color((start = rgb(start)).r, (end = rgb(end)).r),
          g = color(start.g, end.g),
          b = color(start.b, end.b),
          opacity = nogamma(start.opacity, end.opacity);
      return function(t) {
        start.r = r(t);
        start.g = g(t);
        start.b = b(t);
        start.opacity = opacity(t);
        return start + "";
      };
    }

    rgb$1.gamma = rgbGamma;

    return rgb$1;
  })(1);

  function interpolateNumber(a, b) {
    return a = +a, b -= a, function(t) {
      return a + b * t;
    };
  }

  var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g,
      reB = new RegExp(reA.source, "g");

  function zero(b) {
    return function() {
      return b;
    };
  }

  function one(b) {
    return function(t) {
      return b(t) + "";
    };
  }

  function interpolateString(a, b) {
    var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b
        am, // current match in a
        bm, // current match in b
        bs, // string preceding current number in b, if any
        i = -1, // index in s
        s = [], // string constants and placeholders
        q = []; // number interpolators

    // Coerce inputs to strings.
    a = a + "", b = b + "";

    // Interpolate pairs of numbers in a & b.
    while ((am = reA.exec(a))
        && (bm = reB.exec(b))) {
      if ((bs = bm.index) > bi) { // a string precedes the next number in b
        bs = b.slice(bi, bs);
        if (s[i]) s[i] += bs; // coalesce with previous string
        else s[++i] = bs;
      }
      if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match
        if (s[i]) s[i] += bm; // coalesce with previous string
        else s[++i] = bm;
      } else { // interpolate non-matching numbers
        s[++i] = null;
        q.push({i: i, x: interpolateNumber(am, bm)});
      }
      bi = reB.lastIndex;
    }

    // Add remains of b.
    if (bi < b.length) {
      bs = b.slice(bi);
      if (s[i]) s[i] += bs; // coalesce with previous string
      else s[++i] = bs;
    }

    // Special optimization for only a single match.
    // Otherwise, interpolate each of the numbers and rejoin the string.
    return s.length < 2 ? (q[0]
        ? one(q[0].x)
        : zero(b))
        : (b = q.length, function(t) {
            for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);
            return s.join("");
          });
  }

  var degrees = 180 / Math.PI;

  var identity = {
    translateX: 0,
    translateY: 0,
    rotate: 0,
    skewX: 0,
    scaleX: 1,
    scaleY: 1
  };

  function decompose(a, b, c, d, e, f) {
    var scaleX, scaleY, skewX;
    if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
    if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
    if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
    if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
    return {
      translateX: e,
      translateY: f,
      rotate: Math.atan2(b, a) * degrees,
      skewX: Math.atan(skewX) * degrees,
      scaleX: scaleX,
      scaleY: scaleY
    };
  }

  var cssNode,
      cssRoot,
      cssView,
      svgNode;

  function parseCss(value) {
    if (value === "none") return identity;
    if (!cssNode) cssNode = document.createElement("DIV"), cssRoot = document.documentElement, cssView = document.defaultView;
    cssNode.style.transform = value;
    value = cssView.getComputedStyle(cssRoot.appendChild(cssNode), null).getPropertyValue("transform");
    cssRoot.removeChild(cssNode);
    value = value.slice(7, -1).split(",");
    return decompose(+value[0], +value[1], +value[2], +value[3], +value[4], +value[5]);
  }

  function parseSvg(value) {
    if (value == null) return identity;
    if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
    svgNode.setAttribute("transform", value);
    if (!(value = svgNode.transform.baseVal.consolidate())) return identity;
    value = value.matrix;
    return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
  }

  function interpolateTransform(parse, pxComma, pxParen, degParen) {

    function pop(s) {
      return s.length ? s.pop() + " " : "";
    }

    function translate(xa, ya, xb, yb, s, q) {
      if (xa !== xb || ya !== yb) {
        var i = s.push("translate(", null, pxComma, null, pxParen);
        q.push({i: i - 4, x: interpolateNumber(xa, xb)}, {i: i - 2, x: interpolateNumber(ya, yb)});
      } else if (xb || yb) {
        s.push("translate(" + xb + pxComma + yb + pxParen);
      }
    }

    function rotate(a, b, s, q) {
      if (a !== b) {
        if (a - b > 180) b += 360; else if (b - a > 180) a += 360; // shortest path
        q.push({i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: interpolateNumber(a, b)});
      } else if (b) {
        s.push(pop(s) + "rotate(" + b + degParen);
      }
    }

    function skewX(a, b, s, q) {
      if (a !== b) {
        q.push({i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: interpolateNumber(a, b)});
      } else if (b) {
        s.push(pop(s) + "skewX(" + b + degParen);
      }
    }

    function scale(xa, ya, xb, yb, s, q) {
      if (xa !== xb || ya !== yb) {
        var i = s.push(pop(s) + "scale(", null, ",", null, ")");
        q.push({i: i - 4, x: interpolateNumber(xa, xb)}, {i: i - 2, x: interpolateNumber(ya, yb)});
      } else if (xb !== 1 || yb !== 1) {
        s.push(pop(s) + "scale(" + xb + "," + yb + ")");
      }
    }

    return function(a, b) {
      var s = [], // string constants and placeholders
          q = []; // number interpolators
      a = parse(a), b = parse(b);
      translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
      rotate(a.rotate, b.rotate, s, q);
      skewX(a.skewX, b.skewX, s, q);
      scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
      a = b = null; // gc
      return function(t) {
        var i = -1, n = q.length, o;
        while (++i < n) s[(o = q[i]).i] = o.x(t);
        return s.join("");
      };
    };
  }

  var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
  var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");

  var rho = Math.SQRT2,
      rho2 = 2,
      rho4 = 4,
      epsilon2 = 1e-12;

  function cosh(x) {
    return ((x = Math.exp(x)) + 1 / x) / 2;
  }

  function sinh(x) {
    return ((x = Math.exp(x)) - 1 / x) / 2;
  }

  function tanh(x) {
    return ((x = Math.exp(2 * x)) - 1) / (x + 1);
  }

  // p0 = [ux0, uy0, w0]
  // p1 = [ux1, uy1, w1]
  function interpolateZoom(p0, p1) {
    var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
        ux1 = p1[0], uy1 = p1[1], w1 = p1[2],
        dx = ux1 - ux0,
        dy = uy1 - uy0,
        d2 = dx * dx + dy * dy,
        i,
        S;

    // Special case for u0 ≅ u1.
    if (d2 < epsilon2) {
      S = Math.log(w1 / w0) / rho;
      i = function(t) {
        return [
          ux0 + t * dx,
          uy0 + t * dy,
          w0 * Math.exp(rho * t * S)
        ];
      };
    }

    // General case.
    else {
      var d1 = Math.sqrt(d2),
          b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
          b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
          r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
          r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
      S = (r1 - r0) / rho;
      i = function(t) {
        var s = t * S,
            coshr0 = cosh(r0),
            u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
        return [
          ux0 + u * dx,
          uy0 + u * dy,
          w0 * coshr0 / cosh(rho * s + r0)
        ];
      };
    }

    i.duration = S * 1000;

    return i;
  }

  var frame = 0, // is an animation frame pending?
      timeout = 0, // is a timeout pending?
      interval = 0, // are any timers active?
      pokeDelay = 1000, // how frequently we check for clock skew
      taskHead,
      taskTail,
      clockLast = 0,
      clockNow = 0,
      clockSkew = 0,
      clock = typeof performance === "object" && performance.now ? performance : Date,
      setFrame = typeof window === "object" && window.requestAnimationFrame ? window.requestAnimationFrame.bind(window) : function(f) { setTimeout(f, 17); };

  function now() {
    return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
  }

  function clearNow() {
    clockNow = 0;
  }

  function Timer() {
    this._call =
    this._time =
    this._next = null;
  }

  Timer.prototype = timer.prototype = {
    constructor: Timer,
    restart: function(callback, delay, time) {
      if (typeof callback !== "function") throw new TypeError("callback is not a function");
      time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
      if (!this._next && taskTail !== this) {
        if (taskTail) taskTail._next = this;
        else taskHead = this;
        taskTail = this;
      }
      this._call = callback;
      this._time = time;
      sleep();
    },
    stop: function() {
      if (this._call) {
        this._call = null;
        this._time = Infinity;
        sleep();
      }
    }
  };

  function timer(callback, delay, time) {
    var t = new Timer;
    t.restart(callback, delay, time);
    return t;
  }

  function timerFlush() {
    now(); // Get the current time, if not already set.
    ++frame; // Pretend we’ve set an alarm, if we haven’t already.
    var t = taskHead, e;
    while (t) {
      if ((e = clockNow - t._time) >= 0) t._call.call(null, e);
      t = t._next;
    }
    --frame;
  }

  function wake() {
    clockNow = (clockLast = clock.now()) + clockSkew;
    frame = timeout = 0;
    try {
      timerFlush();
    } finally {
      frame = 0;
      nap();
      clockNow = 0;
    }
  }

  function poke() {
    var now = clock.now(), delay = now - clockLast;
    if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
  }

  function nap() {
    var t0, t1 = taskHead, t2, time = Infinity;
    while (t1) {
      if (t1._call) {
        if (time > t1._time) time = t1._time;
        t0 = t1, t1 = t1._next;
      } else {
        t2 = t1._next, t1._next = null;
        t1 = t0 ? t0._next = t2 : taskHead = t2;
      }
    }
    taskTail = t0;
    sleep(time);
  }

  function sleep(time) {
    if (frame) return; // Soonest alarm already set, or will be.
    if (timeout) timeout = clearTimeout(timeout);
    var delay = time - clockNow; // Strictly less than if we recomputed clockNow.
    if (delay > 24) {
      if (time < Infinity) timeout = setTimeout(wake, time - clock.now() - clockSkew);
      if (interval) interval = clearInterval(interval);
    } else {
      if (!interval) clockLast = clock.now(), interval = setInterval(poke, pokeDelay);
      frame = 1, setFrame(wake);
    }
  }

  function timeout$1(callback, delay, time) {
    var t = new Timer;
    delay = delay == null ? 0 : +delay;
    t.restart(function(elapsed) {
      t.stop();
      callback(elapsed + delay);
    }, delay, time);
    return t;
  }

  var emptyOn = dispatch("start", "end", "cancel", "interrupt");
  var emptyTween = [];

  var CREATED = 0;
  var SCHEDULED = 1;
  var STARTING = 2;
  var STARTED = 3;
  var RUNNING = 4;
  var ENDING = 5;
  var ENDED = 6;

  function schedule(node, name, id, index, group, timing) {
    var schedules = node.__transition;
    if (!schedules) node.__transition = {};
    else if (id in schedules) return;
    create(node, id, {
      name: name,
      index: index, // For context during callback.
      group: group, // For context during callback.
      on: emptyOn,
      tween: emptyTween,
      time: timing.time,
      delay: timing.delay,
      duration: timing.duration,
      ease: timing.ease,
      timer: null,
      state: CREATED
    });
  }

  function init(node, id) {
    var schedule = get$4(node, id);
    if (schedule.state > CREATED) throw new Error("too late; already scheduled");
    return schedule;
  }

  function set$4(node, id) {
    var schedule = get$4(node, id);
    if (schedule.state > STARTED) throw new Error("too late; already running");
    return schedule;
  }

  function get$4(node, id) {
    var schedule = node.__transition;
    if (!schedule || !(schedule = schedule[id])) throw new Error("transition not found");
    return schedule;
  }

  function create(node, id, self) {
    var schedules = node.__transition,
        tween;

    // Initialize the self timer when the transition is created.
    // Note the actual delay is not known until the first callback!
    schedules[id] = self;
    self.timer = timer(schedule, 0, self.time);

    function schedule(elapsed) {
      self.state = SCHEDULED;
      self.timer.restart(start, self.delay, self.time);

      // If the elapsed delay is less than our first sleep, start immediately.
      if (self.delay <= elapsed) start(elapsed - self.delay);
    }

    function start(elapsed) {
      var i, j, n, o;

      // If the state is not SCHEDULED, then we previously errored on start.
      if (self.state !== SCHEDULED) return stop();

      for (i in schedules) {
        o = schedules[i];
        if (o.name !== self.name) continue;

        // While this element already has a starting transition during this frame,
        // defer starting an interrupting transition until that transition has a
        // chance to tick (and possibly end); see d3/d3-transition#54!
        if (o.state === STARTED) return timeout$1(start);

        // Interrupt the active transition, if any.
        if (o.state === RUNNING) {
          o.state = ENDED;
          o.timer.stop();
          o.on.call("interrupt", node, node.__data__, o.index, o.group);
          delete schedules[i];
        }

        // Cancel any pre-empted transitions.
        else if (+i < id) {
          o.state = ENDED;
          o.timer.stop();
          o.on.call("cancel", node, node.__data__, o.index, o.group);
          delete schedules[i];
        }
      }

      // Defer the first tick to end of the current frame; see d3/d3#1576.
      // Note the transition may be canceled after start and before the first tick!
      // Note this must be scheduled before the start event; see d3/d3-transition#16!
      // Assuming this is successful, subsequent callbacks go straight to tick.
      timeout$1(function() {
        if (self.state === STARTED) {
          self.state = RUNNING;
          self.timer.restart(tick, self.delay, self.time);
          tick(elapsed);
        }
      });

      // Dispatch the start event.
      // Note this must be done before the tween are initialized.
      self.state = STARTING;
      self.on.call("start", node, node.__data__, self.index, self.group);
      if (self.state !== STARTING) return; // interrupted
      self.state = STARTED;

      // Initialize the tween, deleting null tween.
      tween = new Array(n = self.tween.length);
      for (i = 0, j = -1; i < n; ++i) {
        if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
          tween[++j] = o;
        }
      }
      tween.length = j + 1;
    }

    function tick(elapsed) {
      var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
          i = -1,
          n = tween.length;

      while (++i < n) {
        tween[i].call(node, t);
      }

      // Dispatch the end event.
      if (self.state === ENDING) {
        self.on.call("end", node, node.__data__, self.index, self.group);
        stop();
      }
    }

    function stop() {
      self.state = ENDED;
      self.timer.stop();
      delete schedules[id];
      for (var i in schedules) return; // eslint-disable-line no-unused-vars
      delete node.__transition;
    }
  }

  function interrupt(node, name) {
    var schedules = node.__transition,
        schedule,
        active,
        empty = true,
        i;

    if (!schedules) return;

    name = name == null ? null : name + "";

    for (i in schedules) {
      if ((schedule = schedules[i]).name !== name) { empty = false; continue; }
      active = schedule.state > STARTING && schedule.state < ENDING;
      schedule.state = ENDED;
      schedule.timer.stop();
      schedule.on.call(active ? "interrupt" : "cancel", node, node.__data__, schedule.index, schedule.group);
      delete schedules[i];
    }

    if (empty) delete node.__transition;
  }

  function selection_interrupt(name) {
    return this.each(function() {
      interrupt(this, name);
    });
  }

  function tweenRemove(id, name) {
    var tween0, tween1;
    return function() {
      var schedule = set$4(this, id),
          tween = schedule.tween;

      // If this node shared tween with the previous node,
      // just assign the updated shared tween and we’re done!
      // Otherwise, copy-on-write.
      if (tween !== tween0) {
        tween1 = tween0 = tween;
        for (var i = 0, n = tween1.length; i < n; ++i) {
          if (tween1[i].name === name) {
            tween1 = tween1.slice();
            tween1.splice(i, 1);
            break;
          }
        }
      }

      schedule.tween = tween1;
    };
  }

  function tweenFunction(id, name, value) {
    var tween0, tween1;
    if (typeof value !== "function") throw new Error;
    return function() {
      var schedule = set$4(this, id),
          tween = schedule.tween;

      // If this node shared tween with the previous node,
      // just assign the updated shared tween and we’re done!
      // Otherwise, copy-on-write.
      if (tween !== tween0) {
        tween1 = (tween0 = tween).slice();
        for (var t = {name: name, value: value}, i = 0, n = tween1.length; i < n; ++i) {
          if (tween1[i].name === name) {
            tween1[i] = t;
            break;
          }
        }
        if (i === n) tween1.push(t);
      }

      schedule.tween = tween1;
    };
  }

  function transition_tween(name, value) {
    var id = this._id;

    name += "";

    if (arguments.length < 2) {
      var tween = get$4(this.node(), id).tween;
      for (var i = 0, n = tween.length, t; i < n; ++i) {
        if ((t = tween[i]).name === name) {
          return t.value;
        }
      }
      return null;
    }

    return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
  }

  function tweenValue(transition, name, value) {
    var id = transition._id;

    transition.each(function() {
      var schedule = set$4(this, id);
      (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
    });

    return function(node) {
      return get$4(node, id).value[name];
    };
  }

  function interpolate(a, b) {
    var c;
    return (typeof b === "number" ? interpolateNumber
        : b instanceof color ? interpolateRgb
        : (c = color(b)) ? (b = c, interpolateRgb)
        : interpolateString)(a, b);
  }

  function attrRemove$1(name) {
    return function() {
      this.removeAttribute(name);
    };
  }

  function attrRemoveNS$1(fullname) {
    return function() {
      this.removeAttributeNS(fullname.space, fullname.local);
    };
  }

  function attrConstant$1(name, interpolate, value1) {
    var string00,
        string1 = value1 + "",
        interpolate0;
    return function() {
      var string0 = this.getAttribute(name);
      return string0 === string1 ? null
          : string0 === string00 ? interpolate0
          : interpolate0 = interpolate(string00 = string0, value1);
    };
  }

  function attrConstantNS$1(fullname, interpolate, value1) {
    var string00,
        string1 = value1 + "",
        interpolate0;
    return function() {
      var string0 = this.getAttributeNS(fullname.space, fullname.local);
      return string0 === string1 ? null
          : string0 === string00 ? interpolate0
          : interpolate0 = interpolate(string00 = string0, value1);
    };
  }

  function attrFunction$1(name, interpolate, value) {
    var string00,
        string10,
        interpolate0;
    return function() {
      var string0, value1 = value(this), string1;
      if (value1 == null) return void this.removeAttribute(name);
      string0 = this.getAttribute(name);
      string1 = value1 + "";
      return string0 === string1 ? null
          : string0 === string00 && string1 === string10 ? interpolate0
          : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
    };
  }

  function attrFunctionNS$1(fullname, interpolate, value) {
    var string00,
        string10,
        interpolate0;
    return function() {
      var string0, value1 = value(this), string1;
      if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
      string0 = this.getAttributeNS(fullname.space, fullname.local);
      string1 = value1 + "";
      return string0 === string1 ? null
          : string0 === string00 && string1 === string10 ? interpolate0
          : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
    };
  }

  function transition_attr(name, value) {
    var fullname = namespace(name), i = fullname === "transform" ? interpolateTransformSvg : interpolate;
    return this.attrTween(name, typeof value === "function"
        ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value))
        : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname)
        : (fullname.local ? attrConstantNS$1 : attrConstant$1)(fullname, i, value));
  }

  function attrInterpolate(name, i) {
    return function(t) {
      this.setAttribute(name, i(t));
    };
  }

  function attrInterpolateNS(fullname, i) {
    return function(t) {
      this.setAttributeNS(fullname.space, fullname.local, i(t));
    };
  }

  function attrTweenNS(fullname, value) {
    var t0, i0;
    function tween() {
      var i = value.apply(this, arguments);
      if (i !== i0) t0 = (i0 = i) && attrInterpolateNS(fullname, i);
      return t0;
    }
    tween._value = value;
    return tween;
  }

  function attrTween(name, value) {
    var t0, i0;
    function tween() {
      var i = value.apply(this, arguments);
      if (i !== i0) t0 = (i0 = i) && attrInterpolate(name, i);
      return t0;
    }
    tween._value = value;
    return tween;
  }

  function transition_attrTween(name, value) {
    var key = "attr." + name;
    if (arguments.length < 2) return (key = this.tween(key)) && key._value;
    if (value == null) return this.tween(key, null);
    if (typeof value !== "function") throw new Error;
    var fullname = namespace(name);
    return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
  }

  function delayFunction(id, value) {
    return function() {
      init(this, id).delay = +value.apply(this, arguments);
    };
  }

  function delayConstant(id, value) {
    return value = +value, function() {
      init(this, id).delay = value;
    };
  }

  function transition_delay(value) {
    var id = this._id;

    return arguments.length
        ? this.each((typeof value === "function"
            ? delayFunction
            : delayConstant)(id, value))
        : get$4(this.node(), id).delay;
  }

  function durationFunction(id, value) {
    return function() {
      set$4(this, id).duration = +value.apply(this, arguments);
    };
  }

  function durationConstant(id, value) {
    return value = +value, function() {
      set$4(this, id).duration = value;
    };
  }

  function transition_duration(value) {
    var id = this._id;

    return arguments.length
        ? this.each((typeof value === "function"
            ? durationFunction
            : durationConstant)(id, value))
        : get$4(this.node(), id).duration;
  }

  function easeConstant(id, value) {
    if (typeof value !== "function") throw new Error;
    return function() {
      set$4(this, id).ease = value;
    };
  }

  function transition_ease(value) {
    var id = this._id;

    return arguments.length
        ? this.each(easeConstant(id, value))
        : get$4(this.node(), id).ease;
  }

  function transition_filter(match) {
    if (typeof match !== "function") match = matcher(match);

    for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
        if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
          subgroup.push(node);
        }
      }
    }

    return new Transition(subgroups, this._parents, this._name, this._id);
  }

  function transition_merge(transition) {
    if (transition._id !== this._id) throw new Error;

    for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
      for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
        if (node = group0[i] || group1[i]) {
          merge[i] = node;
        }
      }
    }

    for (; j < m0; ++j) {
      merges[j] = groups0[j];
    }

    return new Transition(merges, this._parents, this._name, this._id);
  }

  function start(name) {
    return (name + "").trim().split(/^|\s+/).every(function(t) {
      var i = t.indexOf(".");
      if (i >= 0) t = t.slice(0, i);
      return !t || t === "start";
    });
  }

  function onFunction(id, name, listener) {
    var on0, on1, sit = start(name) ? init : set$4;
    return function() {
      var schedule = sit(this, id),
          on = schedule.on;

      // If this node shared a dispatch with the previous node,
      // just assign the updated shared dispatch and we’re done!
      // Otherwise, copy-on-write.
      if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);

      schedule.on = on1;
    };
  }

  function transition_on(name, listener) {
    var id = this._id;

    return arguments.length < 2
        ? get$4(this.node(), id).on.on(name)
        : this.each(onFunction(id, name, listener));
  }

  function removeFunction(id) {
    return function() {
      var parent = this.parentNode;
      for (var i in this.__transition) if (+i !== id) return;
      if (parent) parent.removeChild(this);
    };
  }

  function transition_remove() {
    return this.on("end.remove", removeFunction(this._id));
  }

  function transition_select(select) {
    var name = this._name,
        id = this._id;

    if (typeof select !== "function") select = selector(select);

    for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
        if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
          if ("__data__" in node) subnode.__data__ = node.__data__;
          subgroup[i] = subnode;
          schedule(subgroup[i], name, id, i, subgroup, get$4(node, id));
        }
      }
    }

    return new Transition(subgroups, this._parents, name, id);
  }

  function transition_selectAll(select) {
    var name = this._name,
        id = this._id;

    if (typeof select !== "function") select = selectorAll(select);

    for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
        if (node = group[i]) {
          for (var children = select.call(node, node.__data__, i, group), child, inherit = get$4(node, id), k = 0, l = children.length; k < l; ++k) {
            if (child = children[k]) {
              schedule(child, name, id, k, children, inherit);
            }
          }
          subgroups.push(children);
          parents.push(node);
        }
      }
    }

    return new Transition(subgroups, parents, name, id);
  }

  var Selection$1 = selection.prototype.constructor;

  function transition_selection() {
    return new Selection$1(this._groups, this._parents);
  }

  function styleNull(name, interpolate) {
    var string00,
        string10,
        interpolate0;
    return function() {
      var string0 = styleValue(this, name),
          string1 = (this.style.removeProperty(name), styleValue(this, name));
      return string0 === string1 ? null
          : string0 === string00 && string1 === string10 ? interpolate0
          : interpolate0 = interpolate(string00 = string0, string10 = string1);
    };
  }

  function styleRemove$1(name) {
    return function() {
      this.style.removeProperty(name);
    };
  }

  function styleConstant$1(name, interpolate, value1) {
    var string00,
        string1 = value1 + "",
        interpolate0;
    return function() {
      var string0 = styleValue(this, name);
      return string0 === string1 ? null
          : string0 === string00 ? interpolate0
          : interpolate0 = interpolate(string00 = string0, value1);
    };
  }

  function styleFunction$1(name, interpolate, value) {
    var string00,
        string10,
        interpolate0;
    return function() {
      var string0 = styleValue(this, name),
          value1 = value(this),
          string1 = value1 + "";
      if (value1 == null) string1 = value1 = (this.style.removeProperty(name), styleValue(this, name));
      return string0 === string1 ? null
          : string0 === string00 && string1 === string10 ? interpolate0
          : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
    };
  }

  function styleMaybeRemove(id, name) {
    var on0, on1, listener0, key = "style." + name, event = "end." + key, remove;
    return function() {
      var schedule = set$4(this, id),
          on = schedule.on,
          listener = schedule.value[key] == null ? remove || (remove = styleRemove$1(name)) : undefined;

      // If this node shared a dispatch with the previous node,
      // just assign the updated shared dispatch and we’re done!
      // Otherwise, copy-on-write.
      if (on !== on0 || listener0 !== listener) (on1 = (on0 = on).copy()).on(event, listener0 = listener);

      schedule.on = on1;
    };
  }

  function transition_style(name, value, priority) {
    var i = (name += "") === "transform" ? interpolateTransformCss : interpolate;
    return value == null ? this
        .styleTween(name, styleNull(name, i))
        .on("end.style." + name, styleRemove$1(name))
      : typeof value === "function" ? this
        .styleTween(name, styleFunction$1(name, i, tweenValue(this, "style." + name, value)))
        .each(styleMaybeRemove(this._id, name))
      : this
        .styleTween(name, styleConstant$1(name, i, value), priority)
        .on("end.style." + name, null);
  }

  function styleInterpolate(name, i, priority) {
    return function(t) {
      this.style.setProperty(name, i(t), priority);
    };
  }

  function styleTween(name, value, priority) {
    var t, i0;
    function tween() {
      var i = value.apply(this, arguments);
      if (i !== i0) t = (i0 = i) && styleInterpolate(name, i, priority);
      return t;
    }
    tween._value = value;
    return tween;
  }

  function transition_styleTween(name, value, priority) {
    var key = "style." + (name += "");
    if (arguments.length < 2) return (key = this.tween(key)) && key._value;
    if (value == null) return this.tween(key, null);
    if (typeof value !== "function") throw new Error;
    return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
  }

  function textConstant$1(value) {
    return function() {
      this.textContent = value;
    };
  }

  function textFunction$1(value) {
    return function() {
      var value1 = value(this);
      this.textContent = value1 == null ? "" : value1;
    };
  }

  function transition_text(value) {
    return this.tween("text", typeof value === "function"
        ? textFunction$1(tweenValue(this, "text", value))
        : textConstant$1(value == null ? "" : value + ""));
  }

  function transition_transition() {
    var name = this._name,
        id0 = this._id,
        id1 = newId();

    for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
        if (node = group[i]) {
          var inherit = get$4(node, id0);
          schedule(node, name, id1, i, group, {
            time: inherit.time + inherit.delay + inherit.duration,
            delay: 0,
            duration: inherit.duration,
            ease: inherit.ease
          });
        }
      }
    }

    return new Transition(groups, this._parents, name, id1);
  }

  function transition_end() {
    var on0, on1, that = this, id = that._id, size = that.size();
    return new Promise(function(resolve, reject) {
      var cancel = {value: reject},
          end = {value: function() { if (--size === 0) resolve(); }};

      that.each(function() {
        var schedule = set$4(this, id),
            on = schedule.on;

        // If this node shared a dispatch with the previous node,
        // just assign the updated shared dispatch and we’re done!
        // Otherwise, copy-on-write.
        if (on !== on0) {
          on1 = (on0 = on).copy();
          on1._.cancel.push(cancel);
          on1._.interrupt.push(cancel);
          on1._.end.push(end);
        }

        schedule.on = on1;
      });
    });
  }

  var id = 0;

  function Transition(groups, parents, name, id) {
    this._groups = groups;
    this._parents = parents;
    this._name = name;
    this._id = id;
  }

  function transition(name) {
    return selection().transition(name);
  }

  function newId() {
    return ++id;
  }

  var selection_prototype = selection.prototype;

  Transition.prototype = transition.prototype = {
    constructor: Transition,
    select: transition_select,
    selectAll: transition_selectAll,
    filter: transition_filter,
    merge: transition_merge,
    selection: transition_selection,
    transition: transition_transition,
    call: selection_prototype.call,
    nodes: selection_prototype.nodes,
    node: selection_prototype.node,
    size: selection_prototype.size,
    empty: selection_prototype.empty,
    each: selection_prototype.each,
    on: transition_on,
    attr: transition_attr,
    attrTween: transition_attrTween,
    style: transition_style,
    styleTween: transition_styleTween,
    text: transition_text,
    remove: transition_remove,
    tween: transition_tween,
    delay: transition_delay,
    duration: transition_duration,
    ease: transition_ease,
    end: transition_end
  };

  function cubicInOut(t) {
    return ((t *= 2) <= 1 ? t * t * t : (t -= 2) * t * t + 2) / 2;
  }

  var defaultTiming = {
    time: null, // Set on use.
    delay: 0,
    duration: 250,
    ease: cubicInOut
  };

  function inherit(node, id) {
    var timing;
    while (!(timing = node.__transition) || !(timing = timing[id])) {
      if (!(node = node.parentNode)) {
        return defaultTiming.time = now(), defaultTiming;
      }
    }
    return timing;
  }

  function selection_transition(name) {
    var id,
        timing;

    if (name instanceof Transition) {
      id = name._id, name = name._name;
    } else {
      id = newId(), (timing = defaultTiming).time = now(), name = name == null ? null : name + "";
    }

    for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
      for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
        if (node = group[i]) {
          schedule(node, name, id, i, group, timing || inherit(node, id));
        }
      }
    }

    return new Transition(groups, this._parents, name, id);
  }

  selection.prototype.interrupt = selection_interrupt;
  selection.prototype.transition = selection_transition;

  function constant$2(x) {
    return function() {
      return x;
    };
  }

  function ZoomEvent(target, type, transform) {
    this.target = target;
    this.type = type;
    this.transform = transform;
  }

  function Transform(k, x, y) {
    this.k = k;
    this.x = x;
    this.y = y;
  }

  Transform.prototype = {
    constructor: Transform,
    scale: function(k) {
      return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
    },
    translate: function(x, y) {
      return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
    },
    apply: function(point) {
      return [point[0] * this.k + this.x, point[1] * this.k + this.y];
    },
    applyX: function(x) {
      return x * this.k + this.x;
    },
    applyY: function(y) {
      return y * this.k + this.y;
    },
    invert: function(location) {
      return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
    },
    invertX: function(x) {
      return (x - this.x) / this.k;
    },
    invertY: function(y) {
      return (y - this.y) / this.k;
    },
    rescaleX: function(x) {
      return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
    },
    rescaleY: function(y) {
      return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
    },
    toString: function() {
      return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
    }
  };

  var identity$1 = new Transform(1, 0, 0);

  function nopropagation() {
    event.stopImmediatePropagation();
  }

  function noevent$1() {
    event.preventDefault();
    event.stopImmediatePropagation();
  }

  // Ignore right-click, since that should open the context menu.
  function defaultFilter() {
    return !event.ctrlKey && !event.button;
  }

  function defaultExtent() {
    var e = this;
    if (e instanceof SVGElement) {
      e = e.ownerSVGElement || e;
      if (e.hasAttribute("viewBox")) {
        e = e.viewBox.baseVal;
        return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
      }
      return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
    }
    return [[0, 0], [e.clientWidth, e.clientHeight]];
  }

  function defaultTransform() {
    return this.__zoom || identity$1;
  }

  function defaultWheelDelta() {
    return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002);
  }

  function defaultTouchable() {
    return navigator.maxTouchPoints || ("ontouchstart" in this);
  }

  function defaultConstrain(transform, extent, translateExtent) {
    var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
        dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
        dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
        dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
    return transform.translate(
      dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
      dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
    );
  }

  function zoom() {
    var filter = defaultFilter,
        extent = defaultExtent,
        constrain = defaultConstrain,
        wheelDelta = defaultWheelDelta,
        touchable = defaultTouchable,
        scaleExtent = [0, Infinity],
        translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
        duration = 250,
        interpolate = interpolateZoom,
        listeners = dispatch("start", "zoom", "end"),
        touchstarting,
        touchending,
        touchDelay = 500,
        wheelDelay = 150,
        clickDistance2 = 0;

    function zoom(selection) {
      selection
          .property("__zoom", defaultTransform)
          .on("wheel.zoom", wheeled)
          .on("mousedown.zoom", mousedowned)
          .on("dblclick.zoom", dblclicked)
        .filter(touchable)
          .on("touchstart.zoom", touchstarted)
          .on("touchmove.zoom", touchmoved)
          .on("touchend.zoom touchcancel.zoom", touchended)
          .style("touch-action", "none")
          .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
    }

    zoom.transform = function(collection, transform, point) {
      var selection = collection.selection ? collection.selection() : collection;
      selection.property("__zoom", defaultTransform);
      if (collection !== selection) {
        schedule(collection, transform, point);
      } else {
        selection.interrupt().each(function() {
          gesture(this, arguments)
              .start()
              .zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
              .end();
        });
      }
    };

    zoom.scaleBy = function(selection, k, p) {
      zoom.scaleTo(selection, function() {
        var k0 = this.__zoom.k,
            k1 = typeof k === "function" ? k.apply(this, arguments) : k;
        return k0 * k1;
      }, p);
    };

    zoom.scaleTo = function(selection, k, p) {
      zoom.transform(selection, function() {
        var e = extent.apply(this, arguments),
            t0 = this.__zoom,
            p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p,
            p1 = t0.invert(p0),
            k1 = typeof k === "function" ? k.apply(this, arguments) : k;
        return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
      }, p);
    };

    zoom.translateBy = function(selection, x, y) {
      zoom.transform(selection, function() {
        return constrain(this.__zoom.translate(
          typeof x === "function" ? x.apply(this, arguments) : x,
          typeof y === "function" ? y.apply(this, arguments) : y
        ), extent.apply(this, arguments), translateExtent);
      });
    };

    zoom.translateTo = function(selection, x, y, p) {
      zoom.transform(selection, function() {
        var e = extent.apply(this, arguments),
            t = this.__zoom,
            p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p;
        return constrain(identity$1.translate(p0[0], p0[1]).scale(t.k).translate(
          typeof x === "function" ? -x.apply(this, arguments) : -x,
          typeof y === "function" ? -y.apply(this, arguments) : -y
        ), e, translateExtent);
      }, p);
    };

    function scale(transform, k) {
      k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
      return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
    }

    function translate(transform, p0, p1) {
      var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
      return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
    }

    function centroid(extent) {
      return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
    }

    function schedule(transition, transform, point) {
      transition
          .on("start.zoom", function() { gesture(this, arguments).start(); })
          .on("interrupt.zoom end.zoom", function() { gesture(this, arguments).end(); })
          .tween("zoom", function() {
            var that = this,
                args = arguments,
                g = gesture(that, args),
                e = extent.apply(that, args),
                p = point == null ? centroid(e) : typeof point === "function" ? point.apply(that, args) : point,
                w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
                a = that.__zoom,
                b = typeof transform === "function" ? transform.apply(that, args) : transform,
                i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
            return function(t) {
              if (t === 1) t = b; // Avoid rounding error on end.
              else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
              g.zoom(null, t);
            };
          });
    }

    function gesture(that, args, clean) {
      return (!clean && that.__zooming) || new Gesture(that, args);
    }

    function Gesture(that, args) {
      this.that = that;
      this.args = args;
      this.active = 0;
      this.extent = extent.apply(that, args);
      this.taps = 0;
    }

    Gesture.prototype = {
      start: function() {
        if (++this.active === 1) {
          this.that.__zooming = this;
          this.emit("start");
        }
        return this;
      },
      zoom: function(key, transform) {
        if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
        if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
        if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
        this.that.__zoom = transform;
        this.emit("zoom");
        return this;
      },
      end: function() {
        if (--this.active === 0) {
          delete this.that.__zooming;
          this.emit("end");
        }
        return this;
      },
      emit: function(type) {
        customEvent(new ZoomEvent(zoom, type, this.that.__zoom), listeners.apply, listeners, [type, this.that, this.args]);
      }
    };

    function wheeled() {
      if (!filter.apply(this, arguments)) return;
      var g = gesture(this, arguments),
          t = this.__zoom,
          k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
          p = mouse(this);

      // If the mouse is in the same location as before, reuse it.
      // If there were recent wheel events, reset the wheel idle timeout.
      if (g.wheel) {
        if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
          g.mouse[1] = t.invert(g.mouse[0] = p);
        }
        clearTimeout(g.wheel);
      }

      // If this wheel event won’t trigger a transform change, ignore it.
      else if (t.k === k) return;

      // Otherwise, capture the mouse point and location at the start.
      else {
        g.mouse = [p, t.invert(p)];
        interrupt(this);
        g.start();
      }

      noevent$1();
      g.wheel = setTimeout(wheelidled, wheelDelay);
      g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));

      function wheelidled() {
        g.wheel = null;
        g.end();
      }
    }

    function mousedowned() {
      if (touchending || !filter.apply(this, arguments)) return;
      var g = gesture(this, arguments, true),
          v = select(event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
          p = mouse(this),
          x0 = event.clientX,
          y0 = event.clientY;

      dragDisable(event.view);
      nopropagation();
      g.mouse = [p, this.__zoom.invert(p)];
      interrupt(this);
      g.start();

      function mousemoved() {
        noevent$1();
        if (!g.moved) {
          var dx = event.clientX - x0, dy = event.clientY - y0;
          g.moved = dx * dx + dy * dy > clickDistance2;
        }
        g.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = mouse(g.that), g.mouse[1]), g.extent, translateExtent));
      }

      function mouseupped() {
        v.on("mousemove.zoom mouseup.zoom", null);
        yesdrag(event.view, g.moved);
        noevent$1();
        g.end();
      }
    }

    function dblclicked() {
      if (!filter.apply(this, arguments)) return;
      var t0 = this.__zoom,
          p0 = mouse(this),
          p1 = t0.invert(p0),
          k1 = t0.k * (event.shiftKey ? 0.5 : 2),
          t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, arguments), translateExtent);

      noevent$1();
      if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0);
      else select(this).call(zoom.transform, t1);
    }

    function touchstarted() {
      if (!filter.apply(this, arguments)) return;
      var touches = event.touches,
          n = touches.length,
          g = gesture(this, arguments, event.changedTouches.length === n),
          started, i, t, p;

      nopropagation();
      for (i = 0; i < n; ++i) {
        t = touches[i], p = touch(this, touches, t.identifier);
        p = [p, this.__zoom.invert(p), t.identifier];
        if (!g.touch0) g.touch0 = p, started = true, g.taps = 1 + !!touchstarting;
        else if (!g.touch1 && g.touch0[2] !== p[2]) g.touch1 = p, g.taps = 0;
      }

      if (touchstarting) touchstarting = clearTimeout(touchstarting);

      if (started) {
        if (g.taps < 2) touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
        interrupt(this);
        g.start();
      }
    }

    function touchmoved() {
      if (!this.__zooming) return;
      var g = gesture(this, arguments),
          touches = event.changedTouches,
          n = touches.length, i, t, p, l;

      noevent$1();
      if (touchstarting) touchstarting = clearTimeout(touchstarting);
      g.taps = 0;
      for (i = 0; i < n; ++i) {
        t = touches[i], p = touch(this, touches, t.identifier);
        if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
        else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
      }
      t = g.that.__zoom;
      if (g.touch1) {
        var p0 = g.touch0[0], l0 = g.touch0[1],
            p1 = g.touch1[0], l1 = g.touch1[1],
            dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
            dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
        t = scale(t, Math.sqrt(dp / dl));
        p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
        l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
      }
      else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
      else return;
      g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent));
    }

    function touchended() {
      if (!this.__zooming) return;
      var g = gesture(this, arguments),
          touches = event.changedTouches,
          n = touches.length, i, t;

      nopropagation();
      if (touchending) clearTimeout(touchending);
      touchending = setTimeout(function() { touchending = null; }, touchDelay);
      for (i = 0; i < n; ++i) {
        t = touches[i];
        if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
        else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
      }
      if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
      if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);
      else {
        g.end();
        // If this was a dbltap, reroute to the (optional) dblclick.zoom handler.
        if (g.taps === 2) {
          var p = select(this).on("dblclick.zoom");
          if (p) p.apply(this, arguments);
        }
      }
    }

    zoom.wheelDelta = function(_) {
      return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant$2(+_), zoom) : wheelDelta;
    };

    zoom.filter = function(_) {
      return arguments.length ? (filter = typeof _ === "function" ? _ : constant$2(!!_), zoom) : filter;
    };

    zoom.touchable = function(_) {
      return arguments.length ? (touchable = typeof _ === "function" ? _ : constant$2(!!_), zoom) : touchable;
    };

    zoom.extent = function(_) {
      return arguments.length ? (extent = typeof _ === "function" ? _ : constant$2([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
    };

    zoom.scaleExtent = function(_) {
      return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
    };

    zoom.translateExtent = function(_) {
      return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
    };

    zoom.constrain = function(_) {
      return arguments.length ? (constrain = _, zoom) : constrain;
    };

    zoom.duration = function(_) {
      return arguments.length ? (duration = +_, zoom) : duration;
    };

    zoom.interpolate = function(_) {
      return arguments.length ? (interpolate = _, zoom) : interpolate;
    };

    zoom.on = function() {
      var value = listeners.on.apply(listeners, arguments);
      return value === listeners ? zoom : value;
    };

    zoom.clickDistance = function(_) {
      return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
    };

    return zoom;
  }

  // do not edit .js files directly - edit src/index.jst



  var fastDeepEqual = function equal(a, b) {
    if (a === b) return true;

    if (a && b && typeof a == 'object' && typeof b == 'object') {
      if (a.constructor !== b.constructor) return false;

      var length, i, keys;
      if (Array.isArray(a)) {
        length = a.length;
        if (length != b.length) return false;
        for (i = length; i-- !== 0;)
          if (!equal(a[i], b[i])) return false;
        return true;
      }



      if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
      if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
      if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();

      keys = Object.keys(a);
      length = keys.length;
      if (length !== Object.keys(b).length) return false;

      for (i = length; i-- !== 0;)
        if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;

      for (i = length; i-- !== 0;) {
        var key = keys[i];
        if (!equal(a[key], b[key])) return false;
      }

      return true;
    }

    // true if both NaN, false otherwise
    return a!==a && b!==b;
  };

  var actions = {
    setOnConnect: action(function (state, onConnect) {
      state.onConnect = onConnect;
    }),
    setNodes: action(function (state, nodes) {
      state.nodes = nodes;
    }),
    setEdges: action(function (state, edges) {
      state.edges = edges;
    }),
    updateNodeData: action(function (state, _ref) {
      var id = _ref.id,
          data = _objectWithoutProperties(_ref, ["id"]);

      state.nodes.forEach(function (n) {
        if (n.id === id) {
          n.__rg = _objectSpread2$1({}, n.__rg, {}, data);
        }
      });
    }),
    updateNodePos: action(function (state, _ref2) {
      var id = _ref2.id,
          pos = _ref2.pos;
      state.nodes.forEach(function (n) {
        if (n.id === id) {
          n.__rg = _objectSpread2$1({}, n.__rg, {
            position: pos
          });
        }
      });
    }),
    setSelection: action(function (state, isActive) {
      state.selectionActive = isActive;
    }),
    setNodesSelection: action(function (state, _ref3) {
      var isActive = _ref3.isActive,
          selection = _ref3.selection;

      if (!isActive) {
        state.nodesSelectionActive = false;
        state.selectedElements = [];
        return;
      }

      var selectedNodes = getNodesInside(state.nodes, selection, state.transform);
      var selectedNodesBbox = getBoundingBox(selectedNodes);
      state.selection = selection;
      state.nodesSelectionActive = true;
      state.selectedNodesBbox = selectedNodesBbox;
      state.nodesSelectionActive = true;
    }),
    setSelectedElements: action(function (state, elements) {
      var selectedElementsArr = Array.isArray(elements) ? elements : [elements];
      var selectedElementsUpdated = !fastDeepEqual(selectedElementsArr, state.selectedElements);
      var selectedElements = selectedElementsUpdated ? selectedElementsArr : state.selectedElements;
      state.selectedElements = selectedElements;
    }),
    updateSelection: action(function (state, selection) {
      var selectedNodes = getNodesInside(state.nodes, selection, state.transform);
      var selectedEdges = getConnectedEdges(selectedNodes, state.edges);
      var nextSelectedElements = [].concat(_toConsumableArray(selectedNodes), _toConsumableArray(selectedEdges));
      var selectedElementsUpdated = !fastDeepEqual(nextSelectedElements, state.selectedElements);
      state.selection = selection;
      state.selectedElements = selectedElementsUpdated ? nextSelectedElements : state.selectedElements;
    }),
    updateTransform: action(function (state, transform) {
      state.transform = [transform.x, transform.y, transform.k];
    }),
    updateSize: action(function (state, size) {
      state.width = size.width;
      state.height = size.height;
    }),
    initD3: action(function (state, _ref4) {
      var zoom = _ref4.zoom,
          selection = _ref4.selection;
      state.d3Zoom = zoom;
      state.d3Selection = selection;
      state.d3Initialised = true;
    }),
    setConnectionPosition: action(function (state, position) {
      state.connectionPosition = position;
    }),
    setConnectionSourceId: action(function (state, sourceId) {
      state.connectionSourceId = sourceId;
    })
  };

  var store = createStore$1(_objectSpread2$1({
    width: 0,
    height: 0,
    transform: [0, 0, 1],
    nodes: [],
    edges: [],
    selectedElements: [],
    selectedNodesBbox: {
      x: 0,
      y: 0,
      width: 0,
      height: 0
    },
    d3Zoom: null,
    d3Selection: null,
    d3Initialised: false,
    nodesSelectionActive: false,
    selectionActive: false,
    selection: {},
    connectionSourceId: null,
    connectionPosition: {
      x: 0,
      y: 0
    },
    onConnect: function onConnect() {}
  }, actions));

  var isEdge = function isEdge(element) {
    return element.source && element.target;
  };
  var isNode = function isNode(element) {
    return !element.source && !element.target;
  };
  var getOutgoers = function getOutgoers(node, elements) {
    if (!isNode(node)) {
      return [];
    }

    var outgoerIds = elements.filter(function (e) {
      return e.source === node.id;
    }).map(function (e) {
      return e.target;
    });
    return elements.filter(function (e) {
      return outgoerIds.includes(e.id);
    });
  };
  var removeElements = function removeElements(elements, elementsToRemove) {
    var nodeIdsToRemove = elementsToRemove.map(function (n) {
      return n.id;
    });
    return elements.filter(function (e) {
      return !nodeIdsToRemove.includes(e.id) && !nodeIdsToRemove.includes(e.target) && !nodeIdsToRemove.includes(e.source);
    });
  };

  var getEdgeId = function getEdgeId(e) {
    return "react-flow__edge-".concat(e.source, "-").concat(e.target);
  };

  var pointToRendererPoint = function pointToRendererPoint(_ref, transform) {
    var x = _ref.x,
        y = _ref.y;
    var rendererX = (x - transform[0]) * (1 / [transform[2]]);
    var rendererY = (y - transform[1]) * (1 / [transform[2]]);
    return {
      x: rendererX,
      y: rendererY
    };
  };

  var parseElement = function parseElement(e, transform) {
    if (isEdge(e)) {
      return _objectSpread2$1({}, e, {
        type: e.type || 'default',
        id: e.id ? e.id.toString() : getEdgeId(e)
      });
    }

    return _objectSpread2$1({}, e, {
      id: e.id.toString(),
      type: e.type || 'default',
      __rg: {
        position: pointToRendererPoint(e.position, transform),
        width: null,
        height: null,
        handleBounds: {}
      }
    });
  };
  var getBoundingBox = function getBoundingBox(nodes) {
    var bbox = nodes.reduce(function (res, node) {
      var position = node.__rg.position;
      var x2 = position.x + node.__rg.width;
      var y2 = position.y + node.__rg.height;

      if (position.x < res.minX) {
        res.minX = position.x;
      }

      if (x2 > res.maxX) {
        res.maxX = x2;
      }

      if (position.y < res.minY) {
        res.minY = position.y;
      }

      if (y2 > res.maxY) {
        res.maxY = y2;
      }

      return res;
    }, {
      minX: Number.MAX_VALUE,
      minY: Number.MAX_VALUE,
      maxX: 0,
      maxY: 0
    });
    return {
      x: bbox.minX,
      y: bbox.minY,
      width: bbox.maxX - bbox.minX,
      height: bbox.maxY - bbox.minY
    };
  };
  var getNodesInside = function getNodesInside(nodes, bbox) {
    var transform = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : [0, 0, 1];
    var partially = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
    return nodes.filter(function (n) {
      var bboxPos = {
        x: (bbox.x - transform[0]) * (1 / transform[2]),
        y: (bbox.y - transform[1]) * (1 / transform[2])
      };
      var bboxWidth = bbox.width * (1 / transform[2]);
      var bboxHeight = bbox.height * (1 / transform[2]);
      var _n$__rg = n.__rg,
          position = _n$__rg.position,
          width = _n$__rg.width,
          height = _n$__rg.height;
      var nodeWidth = partially ? -width : width;
      var nodeHeight = partially ? 0 : height;
      var offsetX = partially ? width : 0;
      var offsetY = partially ? height : 0;
      return position.x + offsetX > bboxPos.x && position.x + nodeWidth < bboxPos.x + bboxWidth && position.y + offsetY > bboxPos.y && position.y + nodeHeight < bboxPos.y + bboxHeight;
    });
  };
  var getConnectedEdges = function getConnectedEdges(nodes, edges) {
    var nodeIds = nodes.map(function (n) {
      return n.id;
    });
    return edges.filter(function (e) {
      var hasSourceHandleId = e.source.includes('__');
      var hasTargetHandleId = e.target.includes('__');
      var sourceId = hasSourceHandleId ? e.source.split('__')[0] : e.source;
      var targetId = hasTargetHandleId ? e.target.split('__')[0] : e.target;
      return nodeIds.includes(sourceId) || nodeIds.includes(targetId);
    });
  };
  var fitView = function fitView() {
    var _ref2 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
        _ref2$padding = _ref2.padding,
        padding = _ref2$padding === void 0 ? 0 : _ref2$padding;

    var state = store.getState();
    var bounds = getBoundingBox(state.nodes);
    var maxBoundsSize = Math.max(bounds.width, bounds.height);
    var k = Math.min(state.width, state.height) / (maxBoundsSize + maxBoundsSize * padding);
    var boundsCenterX = bounds.x + bounds.width / 2;
    var boundsCenterY = bounds.y + bounds.height / 2;
    var transform = [state.width / 2 - boundsCenterX * k, state.height / 2 - boundsCenterY * k];
    var fittedTransform = identity$1.translate(transform[0], transform[1]).scale(k);
    state.d3Selection.call(state.d3Zoom.transform, fittedTransform);
  };
  var zoomIn = function zoomIn() {
    var state = store.getState();
    state.d3Zoom.scaleTo(state.d3Selection, state.transform[2] + 0.2);
  };
  var zoomOut = function zoomOut() {
    var state = store.getState();
    state.d3Zoom.scaleTo(state.d3Selection, state.transform[2] - 0.2);
  };

  function renderNode(d, props, state) {
    var nodeType = d.type || 'default';

    if (!props.nodeTypes[nodeType]) {
      console.warn("No node type found for type \"".concat(nodeType, "\". Using fallback type \"default\"."));
    }

    var NodeComponent = props.nodeTypes[nodeType] || props.nodeTypes["default"];
    var selected = state.selectedElements.filter(isNode).map(function (e) {
      return e.id;
    }).includes(d.id);
    return React__default.createElement(NodeComponent, {
      key: d.id,
      id: d.id,
      type: d.type,
      data: d.data,
      xPos: d.__rg.position.x,
      yPos: d.__rg.position.y,
      onClick: props.onElementClick,
      onNodeDragStop: props.onNodeDragStop,
      transform: state.transform,
      selected: selected,
      style: d.style
    });
  }

  var NodeRenderer = React.memo(function (props) {
    var state = useStoreState(function (s) {
      return {
        nodes: s.nodes,
        transform: s.transform,
        selectedElements: s.selectedElements
      };
    });
    var transform = state.transform,
        nodes = state.nodes;
    var transformStyle = {
      transform: "translate(".concat(transform[0], "px,").concat(transform[1], "px) scale(").concat(transform[2], ")")
    };
    return React__default.createElement("div", {
      className: "react-flow__nodes",
      style: transformStyle
    }, nodes.map(function (d) {
      return renderNode(d, props, state);
    }));
  });
  NodeRenderer.displayName = 'NodeRenderer';
  NodeRenderer.whyDidYouRender = false;

  var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

  function createCommonjsModule(fn, module) {
  	return module = { exports: {} }, fn(module, module.exports), module.exports;
  }

  var classnames = createCommonjsModule(function (module) {
  /*!
    Copyright (c) 2017 Jed Watson.
    Licensed under the MIT License (MIT), see
    http://jedwatson.github.io/classnames
  */
  /* global define */

  (function () {

  	var hasOwn = {}.hasOwnProperty;

  	function classNames () {
  		var classes = [];

  		for (var i = 0; i < arguments.length; i++) {
  			var arg = arguments[i];
  			if (!arg) continue;

  			var argType = typeof arg;

  			if (argType === 'string' || argType === 'number') {
  				classes.push(arg);
  			} else if (Array.isArray(arg) && arg.length) {
  				var inner = classNames.apply(null, arg);
  				if (inner) {
  					classes.push(inner);
  				}
  			} else if (argType === 'object') {
  				for (var key in arg) {
  					if (hasOwn.call(arg, key) && arg[key]) {
  						classes.push(key);
  					}
  				}
  			}
  		}

  		return classes.join(' ');
  	}

  	if ( module.exports) {
  		classNames.default = classNames;
  		module.exports = classNames;
  	} else {
  		window.classNames = classNames;
  	}
  }());
  });

  var ConnectionLine = (function (props) {
    var _useState = React.useState(null),
        _useState2 = _slicedToArray(_useState, 2),
        sourceNode = _useState2[0],
        setSourceNode = _useState2[1];

    var hasHandleId = props.connectionSourceId.includes('__');
    var sourceIdSplitted = props.connectionSourceId.split('__');
    var nodeId = sourceIdSplitted[0];
    var handleId = hasHandleId ? sourceIdSplitted[1] : null;
    React.useEffect(function () {
      setSourceNode(props.nodes.find(function (n) {
        return n.id === nodeId;
      }));
    }, []);

    if (!sourceNode) {
      return null;
    }

    var style = props.connectionLineStyle || {};
    var className = classnames('react-flow__edge', 'connection', props.className);
    var sourceHandle = handleId ? sourceNode.__rg.handleBounds.source.find(function (d) {
      return d.id === handleId;
    }) : sourceNode.__rg.handleBounds.source[0];
    var sourceHandleX = sourceHandle ? sourceHandle.x + sourceHandle.width / 2 : sourceNode.__rg.width / 2;
    var sourceHandleY = sourceHandle ? sourceHandle.y + sourceHandle.height / 2 : sourceNode.__rg.height;
    var sourceX = sourceNode.__rg.position.x + sourceHandleX;
    var sourceY = sourceNode.__rg.position.y + sourceHandleY;
    var targetX = (props.connectionPositionX - props.transform[0]) * (1 / props.transform[2]);
    var targetY = (props.connectionPositionY - props.transform[1]) * (1 / props.transform[2]);
    var dAttr = '';

    if (props.connectionLineType === 'bezier') {
      var yOffset = Math.abs(targetY - sourceY) / 2;
      var centerY = targetY < sourceY ? targetY + yOffset : targetY - yOffset;
      dAttr = "M".concat(sourceX, ",").concat(sourceY, " C").concat(sourceX, ",").concat(centerY, " ").concat(targetX, ",").concat(centerY, " ").concat(targetX, ",").concat(targetY);
    } else {
      dAttr = "M".concat(sourceX, ",").concat(sourceY, " ").concat(targetX, ",").concat(targetY);
    }

    return React__default.createElement("g", {
      className: className
    }, React__default.createElement("path", _extends$1({
      d: dAttr
    }, style)));
  });

  function getHandlePosition(position, node) {
    var handle = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

    if (!handle) {
      switch (position) {
        case 'top':
          return {
            x: node.__rg.width / 2,
            y: 0
          };

        case 'right':
          return {
            x: node.__rg.width,
            y: node.__rg.height / 2
          };

        case 'bottom':
          return {
            x: node.__rg.width / 2,
            y: node.__rg.height
          };

        case 'left':
          return {
            x: 0,
            y: node.__rg.height / 2
          };
      }
    }

    switch (position) {
      case 'top':
        return {
          x: handle.x + handle.width / 2,
          y: handle.y
        };

      case 'right':
        return {
          x: handle.x + handle.width,
          y: handle.y + handle.height / 2
        };

      case 'bottom':
        return {
          x: handle.x + handle.width / 2,
          y: handle.y + handle.height
        };

      case 'left':
        return {
          x: handle.x,
          y: handle.y + handle.height / 2
        };
    }
  }

  function getHandle(bounds, handleId) {
    var handle = null;

    if (!bounds) {
      return null;
    } // there is no handleId when there are no multiple handles/ handles with ids
    // so we just pick the first one


    if (bounds.length === 1 || !handleId) {
      handle = bounds[0];
    } else if (handleId) {
      handle = bounds.find(function (d) {
        return d.id === handleId;
      });
    }

    return handle;
  }

  function getEdgePositions(_ref) {
    var sourceNode = _ref.sourceNode,
        sourceHandle = _ref.sourceHandle,
        sourcePosition = _ref.sourcePosition,
        targetNode = _ref.targetNode,
        targetHandle = _ref.targetHandle,
        targetPosition = _ref.targetPosition;
    var sourceHandlePos = getHandlePosition(sourcePosition, sourceNode, sourceHandle);
    var sourceX = sourceNode.__rg.position.x + sourceHandlePos.x;
    var sourceY = sourceNode.__rg.position.y + sourceHandlePos.y;
    var targetHandlePos = getHandlePosition(targetPosition, targetNode, targetHandle);
    var targetX = targetNode.__rg.position.x + targetHandlePos.x;
    var targetY = targetNode.__rg.position.y + targetHandlePos.y;
    return {
      sourceX: sourceX,
      sourceY: sourceY,
      targetX: targetX,
      targetY: targetY
    };
  }

  function renderEdge(e, props, state) {
    var edgeType = e.type || 'default';
    var hasSourceHandleId = e.source.includes('__');
    var hasTargetHandleId = e.target.includes('__');
    var sourceId = hasSourceHandleId ? e.source.split('__')[0] : e.source;
    var targetId = hasTargetHandleId ? e.target.split('__')[0] : e.target;
    var sourceHandleId = hasSourceHandleId ? e.source.split('__')[1] : null;
    var targetHandleId = hasTargetHandleId ? e.target.split('__')[1] : null;
    var sourceNode = state.nodes.find(function (n) {
      return n.id === sourceId;
    });
    var targetNode = state.nodes.find(function (n) {
      return n.id === targetId;
    });

    if (!sourceNode) {
      throw new Error("couldn't create edge for source id: ".concat(sourceId));
    }

    if (!targetNode) {
      throw new Error("couldn't create edge for target id: ".concat(targetId));
    }

    var EdgeComponent = props.edgeTypes[edgeType] || props.edgeTypes["default"];
    var sourceHandle = getHandle(sourceNode.__rg.handleBounds.source, sourceHandleId);
    var targetHandle = getHandle(targetNode.__rg.handleBounds.target, targetHandleId);
    var sourcePosition = sourceHandle ? sourceHandle.position : 'bottom';
    var targetPosition = targetHandle ? targetHandle.position : 'top';

    var _getEdgePositions = getEdgePositions({
      sourceNode: sourceNode,
      sourceHandle: sourceHandle,
      sourcePosition: sourcePosition,
      targetNode: targetNode,
      targetHandle: targetHandle,
      targetPosition: targetPosition
    }),
        sourceX = _getEdgePositions.sourceX,
        sourceY = _getEdgePositions.sourceY,
        targetX = _getEdgePositions.targetX,
        targetY = _getEdgePositions.targetY;

    var selected = state.selectedElements.filter(isEdge).find(function (elm) {
      return elm.source === sourceId && elm.target === targetId;
    });
    return React__default.createElement(EdgeComponent, {
      key: e.id,
      id: e.id,
      type: e.type,
      onClick: props.onElementClick,
      selected: selected,
      animated: e.animated,
      style: e.style,
      source: sourceId,
      target: targetId,
      sourceHandleId: sourceHandleId,
      targetHandleId: targetHandleId,
      sourceX: sourceX,
      sourceY: sourceY,
      targetX: targetX,
      targetY: targetY,
      sourcePosition: sourcePosition,
      targetPosition: targetPosition
    });
  }

  var EdgeRenderer = React.memo(function (props) {
    var state = useStoreState(function (s) {
      return {
        nodes: s.nodes,
        edges: s.edges,
        transform: s.transform,
        selectedElements: s.selectedElements,
        connectionSourceId: s.connectionSourceId,
        position: s.connectionPosition
      };
    });
    var width = props.width,
        height = props.height,
        connectionLineStyle = props.connectionLineStyle,
        connectionLineType = props.connectionLineType;

    if (!width) {
      return null;
    }

    var transform = state.transform,
        edges = state.edges,
        nodes = state.nodes,
        connectionSourceId = state.connectionSourceId,
        position = state.position;
    var transformStyle = "translate(".concat(transform[0], ",").concat(transform[1], ") scale(").concat(transform[2], ")");
    return React__default.createElement("svg", {
      width: width,
      height: height,
      className: "react-flow__edges"
    }, React__default.createElement("g", {
      transform: transformStyle
    }, edges.map(function (e) {
      return renderEdge(e, props, state);
    }), connectionSourceId && React__default.createElement(ConnectionLine, {
      nodes: nodes,
      connectionSourceId: connectionSourceId,
      connectionPositionX: position.x,
      connectionPositionY: position.y,
      transform: transform,
      connectionLineStyle: connectionLineStyle,
      connectionLineType: connectionLineType
    })));
  });
  EdgeRenderer.displayName = 'EdgeRenderer';

  var baseStyles = {
    position: 'absolute',
    top: 0,
    left: 0
  };
  var GridRenderer = React.memo(function (_ref) {
    var _ref$gap = _ref.gap,
        gap = _ref$gap === void 0 ? 24 : _ref$gap,
        _ref$strokeColor = _ref.strokeColor,
        strokeColor = _ref$strokeColor === void 0 ? '#999' : _ref$strokeColor,
        _ref$strokeWidth = _ref.strokeWidth,
        strokeWidth = _ref$strokeWidth === void 0 ? 0.1 : _ref$strokeWidth,
        style = _ref.style,
        className = _ref.className;

    var _useStoreState = useStoreState(function (s) {
      return s;
    }),
        width = _useStoreState.width,
        height = _useStoreState.height,
        _useStoreState$transf = _slicedToArray(_useStoreState.transform, 3),
        x = _useStoreState$transf[0],
        y = _useStoreState$transf[1],
        scale = _useStoreState$transf[2];

    var gridClasses = classnames('react-flow__grid', className);
    var scaledGap = gap * scale;
    var xStart = x % scaledGap;
    var yStart = y % scaledGap;
    var lineCountX = Math.ceil(width / scaledGap) + 1;
    var lineCountY = Math.ceil(height / scaledGap) + 1;
    var xValues = Array.from({
      length: lineCountX
    }, function (_, index) {
      return "M".concat(index * scaledGap + xStart, " 0 V").concat(height);
    });
    var yValues = Array.from({
      length: lineCountY
    }, function (_, index) {
      return "M0 ".concat(index * scaledGap + yStart, " H").concat(width);
    });
    var path = [].concat(_toConsumableArray(xValues), _toConsumableArray(yValues)).join(' ');
    return React__default.createElement("svg", {
      width: width,
      height: height,
      style: _objectSpread2$1({}, baseStyles, {}, style),
      className: gridClasses
    }, React__default.createElement("path", {
      fill: "none",
      stroke: strokeColor,
      strokeWidth: strokeWidth,
      d: path
    }));
  });
  GridRenderer.displayName = 'GridRenderer';

  var initialRect = {
    startX: 0,
    startY: 0,
    x: 0,
    y: 0,
    width: 0,
    height: 0,
    draw: false
  };

  function getMousePosition(evt) {
    var containerBounds = document.querySelector('.react-flow').getBoundingClientRect();
    return {
      x: evt.clientX - containerBounds.left,
      y: evt.clientY - containerBounds.top
    };
  }

  var UserSelection = React.memo(function () {
    var selectionPane = React.useRef(null);

    var _useState = React.useState(initialRect),
        _useState2 = _slicedToArray(_useState, 2),
        rect = _useState2[0],
        setRect = _useState2[1];

    var setSelection = useStoreActions(function (a) {
      return a.setSelection;
    });
    var updateSelection = useStoreActions(function (a) {
      return a.updateSelection;
    });
    var setNodesSelection = useStoreActions(function (a) {
      return a.setNodesSelection;
    });
    React.useEffect(function () {
      function onMouseDown(evt) {
        var mousePos = getMousePosition(evt);
        setRect(function (currentRect) {
          return _objectSpread2$1({}, currentRect, {
            startX: mousePos.x,
            startY: mousePos.y,
            x: mousePos.x,
            y: mousePos.y,
            draw: true
          });
        });
        setSelection(true);
      }

      function onMouseMove(evt) {
        setRect(function (currentRect) {
          if (!currentRect.draw) {
            return currentRect;
          }

          var mousePos = getMousePosition(evt);
          var negativeX = mousePos.x < currentRect.startX;
          var negativeY = mousePos.y < currentRect.startY;

          var nextRect = _objectSpread2$1({}, currentRect, {
            x: negativeX ? mousePos.x : currentRect.x,
            y: negativeY ? mousePos.y : currentRect.y,
            width: negativeX ? currentRect.startX - mousePos.x : mousePos.x - currentRect.startX,
            height: negativeY ? currentRect.startY - mousePos.y : mousePos.y - currentRect.startY
          });

          updateSelection(nextRect);
          return nextRect;
        });
      }

      function onMouseUp() {
        setRect(function (currentRect) {
          setNodesSelection({
            isActive: true,
            selection: currentRect
          });
          setSelection(false);
          return _objectSpread2$1({}, currentRect, {
            draw: false
          });
        });
      }

      selectionPane.current.addEventListener('mousedown', onMouseDown);
      selectionPane.current.addEventListener('mousemove', onMouseMove);
      selectionPane.current.addEventListener('mouseup', onMouseUp);
      return function () {
        selectionPane.current.removeEventListener('mousedown', onMouseDown);
        selectionPane.current.removeEventListener('mousemove', onMouseMove);
        selectionPane.current.removeEventListener('mouseup', onMouseUp);
      };
    }, []);
    return React__default.createElement("div", {
      className: "react-flow__selectionpane",
      ref: selectionPane
    }, (rect.draw || rect.fixed) && React__default.createElement("div", {
      className: "react-flow__selection",
      style: {
        width: rect.width,
        height: rect.height,
        transform: "translate(".concat(rect.x, "px, ").concat(rect.y, "px)")
      }
    }));
  });

  var reactDraggable = createCommonjsModule(function (module, exports) {
  (function (global, factory) {
  	 module.exports = factory(reactDom, React__default) ;
  }(commonjsGlobal, (function (ReactDOM,React) {
  	ReactDOM = ReactDOM && ReactDOM.hasOwnProperty('default') ? ReactDOM['default'] : ReactDOM;
  	React = React && React.hasOwnProperty('default') ? React['default'] : React;

  	function createCommonjsModule(fn, module) {
  		return module = { exports: {} }, fn(module, module.exports), module.exports;
  	}

  	/**
  	 * Copyright (c) 2013-present, Facebook, Inc.
  	 *
  	 * This source code is licensed under the MIT license found in the
  	 * LICENSE file in the root directory of this source tree.
  	 *
  	 * 
  	 */

  	function makeEmptyFunction(arg) {
  	  return function () {
  	    return arg;
  	  };
  	}

  	/**
  	 * This function accepts and discards inputs; it has no side effects. This is
  	 * primarily useful idiomatically for overridable function endpoints which
  	 * always need to be callable, since JS lacks a null-call idiom ala Cocoa.
  	 */
  	var emptyFunction = function emptyFunction() {};

  	emptyFunction.thatReturns = makeEmptyFunction;
  	emptyFunction.thatReturnsFalse = makeEmptyFunction(false);
  	emptyFunction.thatReturnsTrue = makeEmptyFunction(true);
  	emptyFunction.thatReturnsNull = makeEmptyFunction(null);
  	emptyFunction.thatReturnsThis = function () {
  	  return this;
  	};
  	emptyFunction.thatReturnsArgument = function (arg) {
  	  return arg;
  	};

  	var emptyFunction_1 = emptyFunction;

  	/**
  	 * Copyright (c) 2013-present, Facebook, Inc.
  	 *
  	 * This source code is licensed under the MIT license found in the
  	 * LICENSE file in the root directory of this source tree.
  	 *
  	 */

  	/**
  	 * Use invariant() to assert state which your program assumes to be true.
  	 *
  	 * Provide sprintf-style format (only %s is supported) and arguments
  	 * to provide information about what broke and what you were
  	 * expecting.
  	 *
  	 * The invariant message will be stripped in production, but the invariant
  	 * will remain to ensure logic does not differ in production.
  	 */

  	var validateFormat = function validateFormat(format) {};

  	{
  	  validateFormat = function validateFormat(format) {
  	    if (format === undefined) {
  	      throw new Error('invariant requires an error message argument');
  	    }
  	  };
  	}

  	function invariant(condition, format, a, b, c, d, e, f) {
  	  validateFormat(format);

  	  if (!condition) {
  	    var error;
  	    if (format === undefined) {
  	      error = new Error('Minified exception occurred; use the non-minified dev environment ' + 'for the full error message and additional helpful warnings.');
  	    } else {
  	      var args = [a, b, c, d, e, f];
  	      var argIndex = 0;
  	      error = new Error(format.replace(/%s/g, function () {
  	        return args[argIndex++];
  	      }));
  	      error.name = 'Invariant Violation';
  	    }

  	    error.framesToPop = 1; // we don't care about invariant's own frame
  	    throw error;
  	  }
  	}

  	var invariant_1 = invariant;

  	/**
  	 * Similar to invariant but only logs a warning if the condition is not met.
  	 * This can be used to log issues in development environments in critical
  	 * paths. Removing the logging code for production environments will keep the
  	 * same logic and follow the same code paths.
  	 */

  	var warning = emptyFunction_1;

  	{
  	  var printWarning = function printWarning(format) {
  	    for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
  	      args[_key - 1] = arguments[_key];
  	    }

  	    var argIndex = 0;
  	    var message = 'Warning: ' + format.replace(/%s/g, function () {
  	      return args[argIndex++];
  	    });
  	    if (typeof console !== 'undefined') {
  	      console.error(message);
  	    }
  	    try {
  	      // --- Welcome to debugging React ---
  	      // This error was thrown as a convenience so that you can use this stack
  	      // to find the callsite that caused this warning to fire.
  	      throw new Error(message);
  	    } catch (x) {}
  	  };

  	  warning = function warning(condition, format) {
  	    if (format === undefined) {
  	      throw new Error('`warning(condition, format, ...args)` requires a warning ' + 'message argument');
  	    }

  	    if (format.indexOf('Failed Composite propType: ') === 0) {
  	      return; // Ignore CompositeComponent proptype check.
  	    }

  	    if (!condition) {
  	      for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
  	        args[_key2 - 2] = arguments[_key2];
  	      }

  	      printWarning.apply(undefined, [format].concat(args));
  	    }
  	  };
  	}

  	var warning_1 = warning;

  	/*
  	object-assign
  	(c) Sindre Sorhus
  	@license MIT
  	*/
  	/* eslint-disable no-unused-vars */
  	var getOwnPropertySymbols = Object.getOwnPropertySymbols;
  	var hasOwnProperty = Object.prototype.hasOwnProperty;
  	var propIsEnumerable = Object.prototype.propertyIsEnumerable;

  	function toObject(val) {
  		if (val === null || val === undefined) {
  			throw new TypeError('Object.assign cannot be called with null or undefined');
  		}

  		return Object(val);
  	}

  	function shouldUseNative() {
  		try {
  			if (!Object.assign) {
  				return false;
  			}

  			// Detect buggy property enumeration order in older V8 versions.

  			// https://bugs.chromium.org/p/v8/issues/detail?id=4118
  			var test1 = new String('abc');  // eslint-disable-line no-new-wrappers
  			test1[5] = 'de';
  			if (Object.getOwnPropertyNames(test1)[0] === '5') {
  				return false;
  			}

  			// https://bugs.chromium.org/p/v8/issues/detail?id=3056
  			var test2 = {};
  			for (var i = 0; i < 10; i++) {
  				test2['_' + String.fromCharCode(i)] = i;
  			}
  			var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
  				return test2[n];
  			});
  			if (order2.join('') !== '0123456789') {
  				return false;
  			}

  			// https://bugs.chromium.org/p/v8/issues/detail?id=3056
  			var test3 = {};
  			'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
  				test3[letter] = letter;
  			});
  			if (Object.keys(Object.assign({}, test3)).join('') !==
  					'abcdefghijklmnopqrst') {
  				return false;
  			}

  			return true;
  		} catch (err) {
  			// We don't expect any of the above to throw, but better to be safe.
  			return false;
  		}
  	}

  	var objectAssign = shouldUseNative() ? Object.assign : function (target, source) {
  		var from;
  		var to = toObject(target);
  		var symbols;

  		for (var s = 1; s < arguments.length; s++) {
  			from = Object(arguments[s]);

  			for (var key in from) {
  				if (hasOwnProperty.call(from, key)) {
  					to[key] = from[key];
  				}
  			}

  			if (getOwnPropertySymbols) {
  				symbols = getOwnPropertySymbols(from);
  				for (var i = 0; i < symbols.length; i++) {
  					if (propIsEnumerable.call(from, symbols[i])) {
  						to[symbols[i]] = from[symbols[i]];
  					}
  				}
  			}
  		}

  		return to;
  	};

  	/**
  	 * Copyright (c) 2013-present, Facebook, Inc.
  	 *
  	 * This source code is licensed under the MIT license found in the
  	 * LICENSE file in the root directory of this source tree.
  	 */

  	var ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';

  	var ReactPropTypesSecret_1 = ReactPropTypesSecret;

  	{
  	  var invariant$1 = invariant_1;
  	  var warning$1 = warning_1;
  	  var ReactPropTypesSecret$1 = ReactPropTypesSecret_1;
  	  var loggedTypeFailures = {};
  	}

  	/**
  	 * Assert that the values match with the type specs.
  	 * Error messages are memorized and will only be shown once.
  	 *
  	 * @param {object} typeSpecs Map of name to a ReactPropType
  	 * @param {object} values Runtime values that need to be type-checked
  	 * @param {string} location e.g. "prop", "context", "child context"
  	 * @param {string} componentName Name of the component for error messages.
  	 * @param {?Function} getStack Returns the component stack.
  	 * @private
  	 */
  	function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
  	  {
  	    for (var typeSpecName in typeSpecs) {
  	      if (typeSpecs.hasOwnProperty(typeSpecName)) {
  	        var error;
  	        // Prop type validation may throw. In case they do, we don't want to
  	        // fail the render phase where it didn't fail before. So we log it.
  	        // After these have been cleaned up, we'll let them throw.
  	        try {
  	          // This is intentionally an invariant that gets caught. It's the same
  	          // behavior as without this statement except with a better message.
  	          invariant$1(typeof typeSpecs[typeSpecName] === 'function', '%s: %s type `%s` is invalid; it must be a function, usually from ' + 'the `prop-types` package, but received `%s`.', componentName || 'React class', location, typeSpecName, typeof typeSpecs[typeSpecName]);
  	          error = typeSpecs[typeSpecName](values, typeSpecName, componentName, location, null, ReactPropTypesSecret$1);
  	        } catch (ex) {
  	          error = ex;
  	        }
  	        warning$1(!error || error instanceof Error, '%s: type specification of %s `%s` is invalid; the type checker ' + 'function must return `null` or an `Error` but returned a %s. ' + 'You may have forgotten to pass an argument to the type checker ' + 'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' + 'shape all require an argument).', componentName || 'React class', location, typeSpecName, typeof error);
  	        if (error instanceof Error && !(error.message in loggedTypeFailures)) {
  	          // Only monitor this failure once because there tends to be a lot of the
  	          // same error.
  	          loggedTypeFailures[error.message] = true;

  	          var stack = getStack ? getStack() : '';

  	          warning$1(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '');
  	        }
  	      }
  	    }
  	  }
  	}

  	var checkPropTypes_1 = checkPropTypes;

  	var factoryWithTypeCheckers = function(isValidElement, throwOnDirectAccess) {
  	  /* global Symbol */
  	  var ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
  	  var FAUX_ITERATOR_SYMBOL = '@@iterator'; // Before Symbol spec.

  	  /**
  	   * Returns the iterator method function contained on the iterable object.
  	   *
  	   * Be sure to invoke the function with the iterable as context:
  	   *
  	   *     var iteratorFn = getIteratorFn(myIterable);
  	   *     if (iteratorFn) {
  	   *       var iterator = iteratorFn.call(myIterable);
  	   *       ...
  	   *     }
  	   *
  	   * @param {?object} maybeIterable
  	   * @return {?function}
  	   */
  	  function getIteratorFn(maybeIterable) {
  	    var iteratorFn = maybeIterable && (ITERATOR_SYMBOL && maybeIterable[ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL]);
  	    if (typeof iteratorFn === 'function') {
  	      return iteratorFn;
  	    }
  	  }

  	  /**
  	   * Collection of methods that allow declaration and validation of props that are
  	   * supplied to React components. Example usage:
  	   *
  	   *   var Props = require('ReactPropTypes');
  	   *   var MyArticle = React.createClass({
  	   *     propTypes: {
  	   *       // An optional string prop named "description".
  	   *       description: Props.string,
  	   *
  	   *       // A required enum prop named "category".
  	   *       category: Props.oneOf(['News','Photos']).isRequired,
  	   *
  	   *       // A prop named "dialog" that requires an instance of Dialog.
  	   *       dialog: Props.instanceOf(Dialog).isRequired
  	   *     },
  	   *     render: function() { ... }
  	   *   });
  	   *
  	   * A more formal specification of how these methods are used:
  	   *
  	   *   type := array|bool|func|object|number|string|oneOf([...])|instanceOf(...)
  	   *   decl := ReactPropTypes.{type}(.isRequired)?
  	   *
  	   * Each and every declaration produces a function with the same signature. This
  	   * allows the creation of custom validation functions. For example:
  	   *
  	   *  var MyLink = React.createClass({
  	   *    propTypes: {
  	   *      // An optional string or URI prop named "href".
  	   *      href: function(props, propName, componentName) {
  	   *        var propValue = props[propName];
  	   *        if (propValue != null && typeof propValue !== 'string' &&
  	   *            !(propValue instanceof URI)) {
  	   *          return new Error(
  	   *            'Expected a string or an URI for ' + propName + ' in ' +
  	   *            componentName
  	   *          );
  	   *        }
  	   *      }
  	   *    },
  	   *    render: function() {...}
  	   *  });
  	   *
  	   * @internal
  	   */

  	  var ANONYMOUS = '<<anonymous>>';

  	  // Important!
  	  // Keep this list in sync with production version in `./factoryWithThrowingShims.js`.
  	  var ReactPropTypes = {
  	    array: createPrimitiveTypeChecker('array'),
  	    bool: createPrimitiveTypeChecker('boolean'),
  	    func: createPrimitiveTypeChecker('function'),
  	    number: createPrimitiveTypeChecker('number'),
  	    object: createPrimitiveTypeChecker('object'),
  	    string: createPrimitiveTypeChecker('string'),
  	    symbol: createPrimitiveTypeChecker('symbol'),

  	    any: createAnyTypeChecker(),
  	    arrayOf: createArrayOfTypeChecker,
  	    element: createElementTypeChecker(),
  	    instanceOf: createInstanceTypeChecker,
  	    node: createNodeChecker(),
  	    objectOf: createObjectOfTypeChecker,
  	    oneOf: createEnumTypeChecker,
  	    oneOfType: createUnionTypeChecker,
  	    shape: createShapeTypeChecker,
  	    exact: createStrictShapeTypeChecker,
  	  };

  	  /**
  	   * inlined Object.is polyfill to avoid requiring consumers ship their own
  	   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
  	   */
  	  /*eslint-disable no-self-compare*/
  	  function is(x, y) {
  	    // SameValue algorithm
  	    if (x === y) {
  	      // Steps 1-5, 7-10
  	      // Steps 6.b-6.e: +0 != -0
  	      return x !== 0 || 1 / x === 1 / y;
  	    } else {
  	      // Step 6.a: NaN == NaN
  	      return x !== x && y !== y;
  	    }
  	  }
  	  /*eslint-enable no-self-compare*/

  	  /**
  	   * We use an Error-like object for backward compatibility as people may call
  	   * PropTypes directly and inspect their output. However, we don't use real
  	   * Errors anymore. We don't inspect their stack anyway, and creating them
  	   * is prohibitively expensive if they are created too often, such as what
  	   * happens in oneOfType() for any type before the one that matched.
  	   */
  	  function PropTypeError(message) {
  	    this.message = message;
  	    this.stack = '';
  	  }
  	  // Make `instanceof Error` still work for returned errors.
  	  PropTypeError.prototype = Error.prototype;

  	  function createChainableTypeChecker(validate) {
  	    {
  	      var manualPropTypeCallCache = {};
  	      var manualPropTypeWarningCount = 0;
  	    }
  	    function checkType(isRequired, props, propName, componentName, location, propFullName, secret) {
  	      componentName = componentName || ANONYMOUS;
  	      propFullName = propFullName || propName;

  	      if (secret !== ReactPropTypesSecret_1) {
  	        if (throwOnDirectAccess) {
  	          // New behavior only for users of `prop-types` package
  	          invariant_1(
  	            false,
  	            'Calling PropTypes validators directly is not supported by the `prop-types` package. ' +
  	            'Use `PropTypes.checkPropTypes()` to call them. ' +
  	            'Read more at http://fb.me/use-check-prop-types'
  	          );
  	        } else if ( typeof console !== 'undefined') {
  	          // Old behavior for people using React.PropTypes
  	          var cacheKey = componentName + ':' + propName;
  	          if (
  	            !manualPropTypeCallCache[cacheKey] &&
  	            // Avoid spamming the console because they are often not actionable except for lib authors
  	            manualPropTypeWarningCount < 3
  	          ) {
  	            warning_1(
  	              false,
  	              'You are manually calling a React.PropTypes validation ' +
  	              'function for the `%s` prop on `%s`. This is deprecated ' +
  	              'and will throw in the standalone `prop-types` package. ' +
  	              'You may be seeing this warning due to a third-party PropTypes ' +
  	              'library. See https://fb.me/react-warning-dont-call-proptypes ' + 'for details.',
  	              propFullName,
  	              componentName
  	            );
  	            manualPropTypeCallCache[cacheKey] = true;
  	            manualPropTypeWarningCount++;
  	          }
  	        }
  	      }
  	      if (props[propName] == null) {
  	        if (isRequired) {
  	          if (props[propName] === null) {
  	            return new PropTypeError('The ' + location + ' `' + propFullName + '` is marked as required ' + ('in `' + componentName + '`, but its value is `null`.'));
  	          }
  	          return new PropTypeError('The ' + location + ' `' + propFullName + '` is marked as required in ' + ('`' + componentName + '`, but its value is `undefined`.'));
  	        }
  	        return null;
  	      } else {
  	        return validate(props, propName, componentName, location, propFullName);
  	      }
  	    }

  	    var chainedCheckType = checkType.bind(null, false);
  	    chainedCheckType.isRequired = checkType.bind(null, true);

  	    return chainedCheckType;
  	  }

  	  function createPrimitiveTypeChecker(expectedType) {
  	    function validate(props, propName, componentName, location, propFullName, secret) {
  	      var propValue = props[propName];
  	      var propType = getPropType(propValue);
  	      if (propType !== expectedType) {
  	        // `propValue` being instance of, say, date/regexp, pass the 'object'
  	        // check, but we can offer a more precise error message here rather than
  	        // 'of type `object`'.
  	        var preciseType = getPreciseType(propValue);

  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + preciseType + '` supplied to `' + componentName + '`, expected ') + ('`' + expectedType + '`.'));
  	      }
  	      return null;
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createAnyTypeChecker() {
  	    return createChainableTypeChecker(emptyFunction_1.thatReturnsNull);
  	  }

  	  function createArrayOfTypeChecker(typeChecker) {
  	    function validate(props, propName, componentName, location, propFullName) {
  	      if (typeof typeChecker !== 'function') {
  	        return new PropTypeError('Property `' + propFullName + '` of component `' + componentName + '` has invalid PropType notation inside arrayOf.');
  	      }
  	      var propValue = props[propName];
  	      if (!Array.isArray(propValue)) {
  	        var propType = getPropType(propValue);
  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected an array.'));
  	      }
  	      for (var i = 0; i < propValue.length; i++) {
  	        var error = typeChecker(propValue, i, componentName, location, propFullName + '[' + i + ']', ReactPropTypesSecret_1);
  	        if (error instanceof Error) {
  	          return error;
  	        }
  	      }
  	      return null;
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createElementTypeChecker() {
  	    function validate(props, propName, componentName, location, propFullName) {
  	      var propValue = props[propName];
  	      if (!isValidElement(propValue)) {
  	        var propType = getPropType(propValue);
  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected a single ReactElement.'));
  	      }
  	      return null;
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createInstanceTypeChecker(expectedClass) {
  	    function validate(props, propName, componentName, location, propFullName) {
  	      if (!(props[propName] instanceof expectedClass)) {
  	        var expectedClassName = expectedClass.name || ANONYMOUS;
  	        var actualClassName = getClassName(props[propName]);
  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + actualClassName + '` supplied to `' + componentName + '`, expected ') + ('instance of `' + expectedClassName + '`.'));
  	      }
  	      return null;
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createEnumTypeChecker(expectedValues) {
  	    if (!Array.isArray(expectedValues)) {
  	      warning_1(false, 'Invalid argument supplied to oneOf, expected an instance of array.');
  	      return emptyFunction_1.thatReturnsNull;
  	    }

  	    function validate(props, propName, componentName, location, propFullName) {
  	      var propValue = props[propName];
  	      for (var i = 0; i < expectedValues.length; i++) {
  	        if (is(propValue, expectedValues[i])) {
  	          return null;
  	        }
  	      }

  	      var valuesString = JSON.stringify(expectedValues);
  	      return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of value `' + propValue + '` ' + ('supplied to `' + componentName + '`, expected one of ' + valuesString + '.'));
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createObjectOfTypeChecker(typeChecker) {
  	    function validate(props, propName, componentName, location, propFullName) {
  	      if (typeof typeChecker !== 'function') {
  	        return new PropTypeError('Property `' + propFullName + '` of component `' + componentName + '` has invalid PropType notation inside objectOf.');
  	      }
  	      var propValue = props[propName];
  	      var propType = getPropType(propValue);
  	      if (propType !== 'object') {
  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected an object.'));
  	      }
  	      for (var key in propValue) {
  	        if (propValue.hasOwnProperty(key)) {
  	          var error = typeChecker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
  	          if (error instanceof Error) {
  	            return error;
  	          }
  	        }
  	      }
  	      return null;
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createUnionTypeChecker(arrayOfTypeCheckers) {
  	    if (!Array.isArray(arrayOfTypeCheckers)) {
  	      warning_1(false, 'Invalid argument supplied to oneOfType, expected an instance of array.');
  	      return emptyFunction_1.thatReturnsNull;
  	    }

  	    for (var i = 0; i < arrayOfTypeCheckers.length; i++) {
  	      var checker = arrayOfTypeCheckers[i];
  	      if (typeof checker !== 'function') {
  	        warning_1(
  	          false,
  	          'Invalid argument supplied to oneOfType. Expected an array of check functions, but ' +
  	          'received %s at index %s.',
  	          getPostfixForTypeWarning(checker),
  	          i
  	        );
  	        return emptyFunction_1.thatReturnsNull;
  	      }
  	    }

  	    function validate(props, propName, componentName, location, propFullName) {
  	      for (var i = 0; i < arrayOfTypeCheckers.length; i++) {
  	        var checker = arrayOfTypeCheckers[i];
  	        if (checker(props, propName, componentName, location, propFullName, ReactPropTypesSecret_1) == null) {
  	          return null;
  	        }
  	      }

  	      return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` supplied to ' + ('`' + componentName + '`.'));
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createNodeChecker() {
  	    function validate(props, propName, componentName, location, propFullName) {
  	      if (!isNode(props[propName])) {
  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` supplied to ' + ('`' + componentName + '`, expected a ReactNode.'));
  	      }
  	      return null;
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createShapeTypeChecker(shapeTypes) {
  	    function validate(props, propName, componentName, location, propFullName) {
  	      var propValue = props[propName];
  	      var propType = getPropType(propValue);
  	      if (propType !== 'object') {
  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type `' + propType + '` ' + ('supplied to `' + componentName + '`, expected `object`.'));
  	      }
  	      for (var key in shapeTypes) {
  	        var checker = shapeTypes[key];
  	        if (!checker) {
  	          continue;
  	        }
  	        var error = checker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
  	        if (error) {
  	          return error;
  	        }
  	      }
  	      return null;
  	    }
  	    return createChainableTypeChecker(validate);
  	  }

  	  function createStrictShapeTypeChecker(shapeTypes) {
  	    function validate(props, propName, componentName, location, propFullName) {
  	      var propValue = props[propName];
  	      var propType = getPropType(propValue);
  	      if (propType !== 'object') {
  	        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type `' + propType + '` ' + ('supplied to `' + componentName + '`, expected `object`.'));
  	      }
  	      // We need to check all keys in case some are required but missing from
  	      // props.
  	      var allKeys = objectAssign({}, props[propName], shapeTypes);
  	      for (var key in allKeys) {
  	        var checker = shapeTypes[key];
  	        if (!checker) {
  	          return new PropTypeError(
  	            'Invalid ' + location + ' `' + propFullName + '` key `' + key + '` supplied to `' + componentName + '`.' +
  	            '\nBad object: ' + JSON.stringify(props[propName], null, '  ') +
  	            '\nValid keys: ' +  JSON.stringify(Object.keys(shapeTypes), null, '  ')
  	          );
  	        }
  	        var error = checker(propValue, key, componentName, location, propFullName + '.' + key, ReactPropTypesSecret_1);
  	        if (error) {
  	          return error;
  	        }
  	      }
  	      return null;
  	    }

  	    return createChainableTypeChecker(validate);
  	  }

  	  function isNode(propValue) {
  	    switch (typeof propValue) {
  	      case 'number':
  	      case 'string':
  	      case 'undefined':
  	        return true;
  	      case 'boolean':
  	        return !propValue;
  	      case 'object':
  	        if (Array.isArray(propValue)) {
  	          return propValue.every(isNode);
  	        }
  	        if (propValue === null || isValidElement(propValue)) {
  	          return true;
  	        }

  	        var iteratorFn = getIteratorFn(propValue);
  	        if (iteratorFn) {
  	          var iterator = iteratorFn.call(propValue);
  	          var step;
  	          if (iteratorFn !== propValue.entries) {
  	            while (!(step = iterator.next()).done) {
  	              if (!isNode(step.value)) {
  	                return false;
  	              }
  	            }
  	          } else {
  	            // Iterator will provide entry [k,v] tuples rather than values.
  	            while (!(step = iterator.next()).done) {
  	              var entry = step.value;
  	              if (entry) {
  	                if (!isNode(entry[1])) {
  	                  return false;
  	                }
  	              }
  	            }
  	          }
  	        } else {
  	          return false;
  	        }

  	        return true;
  	      default:
  	        return false;
  	    }
  	  }

  	  function isSymbol(propType, propValue) {
  	    // Native Symbol.
  	    if (propType === 'symbol') {
  	      return true;
  	    }

  	    // 19.4.3.5 Symbol.prototype[@@toStringTag] === 'Symbol'
  	    if (propValue['@@toStringTag'] === 'Symbol') {
  	      return true;
  	    }

  	    // Fallback for non-spec compliant Symbols which are polyfilled.
  	    if (typeof Symbol === 'function' && propValue instanceof Symbol) {
  	      return true;
  	    }

  	    return false;
  	  }

  	  // Equivalent of `typeof` but with special handling for array and regexp.
  	  function getPropType(propValue) {
  	    var propType = typeof propValue;
  	    if (Array.isArray(propValue)) {
  	      return 'array';
  	    }
  	    if (propValue instanceof RegExp) {
  	      // Old webkits (at least until Android 4.0) return 'function' rather than
  	      // 'object' for typeof a RegExp. We'll normalize this here so that /bla/
  	      // passes PropTypes.object.
  	      return 'object';
  	    }
  	    if (isSymbol(propType, propValue)) {
  	      return 'symbol';
  	    }
  	    return propType;
  	  }

  	  // This handles more types than `getPropType`. Only used for error messages.
  	  // See `createPrimitiveTypeChecker`.
  	  function getPreciseType(propValue) {
  	    if (typeof propValue === 'undefined' || propValue === null) {
  	      return '' + propValue;
  	    }
  	    var propType = getPropType(propValue);
  	    if (propType === 'object') {
  	      if (propValue instanceof Date) {
  	        return 'date';
  	      } else if (propValue instanceof RegExp) {
  	        return 'regexp';
  	      }
  	    }
  	    return propType;
  	  }

  	  // Returns a string that is postfixed to a warning about an invalid type.
  	  // For example, "undefined" or "of type array"
  	  function getPostfixForTypeWarning(value) {
  	    var type = getPreciseType(value);
  	    switch (type) {
  	      case 'array':
  	      case 'object':
  	        return 'an ' + type;
  	      case 'boolean':
  	      case 'date':
  	      case 'regexp':
  	        return 'a ' + type;
  	      default:
  	        return type;
  	    }
  	  }

  	  // Returns class name of the object, if any.
  	  function getClassName(propValue) {
  	    if (!propValue.constructor || !propValue.constructor.name) {
  	      return ANONYMOUS;
  	    }
  	    return propValue.constructor.name;
  	  }

  	  ReactPropTypes.checkPropTypes = checkPropTypes_1;
  	  ReactPropTypes.PropTypes = ReactPropTypes;

  	  return ReactPropTypes;
  	};

  	var propTypes = createCommonjsModule(function (module) {
  	/**
  	 * Copyright (c) 2013-present, Facebook, Inc.
  	 *
  	 * This source code is licensed under the MIT license found in the
  	 * LICENSE file in the root directory of this source tree.
  	 */

  	{
  	  var REACT_ELEMENT_TYPE = (typeof Symbol === 'function' &&
  	    Symbol.for &&
  	    Symbol.for('react.element')) ||
  	    0xeac7;

  	  var isValidElement = function(object) {
  	    return typeof object === 'object' &&
  	      object !== null &&
  	      object.$$typeof === REACT_ELEMENT_TYPE;
  	  };

  	  // By explicitly using `prop-types` you are opting into new development behavior.
  	  // http://fb.me/prop-types-in-prod
  	  var throwOnDirectAccess = true;
  	  module.exports = factoryWithTypeCheckers(isValidElement, throwOnDirectAccess);
  	}
  	});

  	var classnames = createCommonjsModule(function (module) {
  	/*!
  	  Copyright (c) 2016 Jed Watson.
  	  Licensed under the MIT License (MIT), see
  	  http://jedwatson.github.io/classnames
  	*/
  	/* global define */

  	(function () {

  		var hasOwn = {}.hasOwnProperty;

  		function classNames () {
  			var classes = [];

  			for (var i = 0; i < arguments.length; i++) {
  				var arg = arguments[i];
  				if (!arg) continue;

  				var argType = typeof arg;

  				if (argType === 'string' || argType === 'number') {
  					classes.push(arg);
  				} else if (Array.isArray(arg)) {
  					classes.push(classNames.apply(null, arg));
  				} else if (argType === 'object') {
  					for (var key in arg) {
  						if (hasOwn.call(arg, key) && arg[key]) {
  							classes.push(key);
  						}
  					}
  				}
  			}

  			return classes.join(' ');
  		}

  		if ( module.exports) {
  			module.exports = classNames;
  		} else {
  			window.classNames = classNames;
  		}
  	}());
  	});

  	// @credits https://gist.github.com/rogozhnikoff/a43cfed27c41e4e68cdc
  	function findInArray(array /*: Array<any> | TouchList*/, callback /*: Function*/) /*: any*/ {
  	  for (var i = 0, length = array.length; i < length; i++) {
  	    if (callback.apply(callback, [array[i], i, array])) return array[i];
  	  }
  	}

  	function isFunction(func /*: any*/) /*: boolean*/ {
  	  return typeof func === 'function' || Object.prototype.toString.call(func) === '[object Function]';
  	}

  	function isNum(num /*: any*/) /*: boolean*/ {
  	  return typeof num === 'number' && !isNaN(num);
  	}

  	function int(a /*: string*/) /*: number*/ {
  	  return parseInt(a, 10);
  	}

  	function dontSetMe(props /*: Object*/, propName /*: string*/, componentName /*: string*/) {
  	  if (props[propName]) {
  	    return new Error('Invalid prop ' + propName + ' passed to ' + componentName + ' - do not set this, set it on the child.');
  	  }
  	}

  	var prefixes = ['Moz', 'Webkit', 'O', 'ms'];
  	function getPrefix() /*: string*/ {
  	  var prop /*: string*/ = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'transform';

  	  // Checking specifically for 'window.document' is for pseudo-browser server-side
  	  // environments that define 'window' as the global context.
  	  // E.g. React-rails (see https://github.com/reactjs/react-rails/pull/84)
  	  if (typeof window === 'undefined' || typeof window.document === 'undefined') return '';

  	  var style = window.document.documentElement.style;

  	  if (prop in style) return '';

  	  for (var i = 0; i < prefixes.length; i++) {
  	    if (browserPrefixToKey(prop, prefixes[i]) in style) return prefixes[i];
  	  }

  	  return '';
  	}

  	function browserPrefixToKey(prop /*: string*/, prefix /*: string*/) /*: string*/ {
  	  return prefix ? '' + prefix + kebabToTitleCase(prop) : prop;
  	}

  	function kebabToTitleCase(str /*: string*/) /*: string*/ {
  	  var out = '';
  	  var shouldCapitalize = true;
  	  for (var i = 0; i < str.length; i++) {
  	    if (shouldCapitalize) {
  	      out += str[i].toUpperCase();
  	      shouldCapitalize = false;
  	    } else if (str[i] === '-') {
  	      shouldCapitalize = true;
  	    } else {
  	      out += str[i];
  	    }
  	  }
  	  return out;
  	}

  	// Default export is the prefix itself, like 'Moz', 'Webkit', etc
  	// Note that you may have to re-test for certain things; for instance, Chrome 50
  	// can handle unprefixed `transform`, but not unprefixed `user-select`
  	var browserPrefix = getPrefix();

  	var classCallCheck = function (instance, Constructor) {
  	  if (!(instance instanceof Constructor)) {
  	    throw new TypeError("Cannot call a class as a function");
  	  }
  	};

  	var createClass = function () {
  	  function defineProperties(target, props) {
  	    for (var i = 0; i < props.length; i++) {
  	      var descriptor = props[i];
  	      descriptor.enumerable = descriptor.enumerable || false;
  	      descriptor.configurable = true;
  	      if ("value" in descriptor) descriptor.writable = true;
  	      Object.defineProperty(target, descriptor.key, descriptor);
  	    }
  	  }

  	  return function (Constructor, protoProps, staticProps) {
  	    if (protoProps) defineProperties(Constructor.prototype, protoProps);
  	    if (staticProps) defineProperties(Constructor, staticProps);
  	    return Constructor;
  	  };
  	}();

  	var defineProperty = function (obj, key, value) {
  	  if (key in obj) {
  	    Object.defineProperty(obj, key, {
  	      value: value,
  	      enumerable: true,
  	      configurable: true,
  	      writable: true
  	    });
  	  } else {
  	    obj[key] = value;
  	  }

  	  return obj;
  	};

  	var _extends = Object.assign || function (target) {
  	  for (var i = 1; i < arguments.length; i++) {
  	    var source = arguments[i];

  	    for (var key in source) {
  	      if (Object.prototype.hasOwnProperty.call(source, key)) {
  	        target[key] = source[key];
  	      }
  	    }
  	  }

  	  return target;
  	};

  	var inherits = function (subClass, superClass) {
  	  if (typeof superClass !== "function" && superClass !== null) {
  	    throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
  	  }

  	  subClass.prototype = Object.create(superClass && superClass.prototype, {
  	    constructor: {
  	      value: subClass,
  	      enumerable: false,
  	      writable: true,
  	      configurable: true
  	    }
  	  });
  	  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
  	};

  	var possibleConstructorReturn = function (self, call) {
  	  if (!self) {
  	    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  	  }

  	  return call && (typeof call === "object" || typeof call === "function") ? call : self;
  	};

  	var slicedToArray = function () {
  	  function sliceIterator(arr, i) {
  	    var _arr = [];
  	    var _n = true;
  	    var _d = false;
  	    var _e = undefined;

  	    try {
  	      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
  	        _arr.push(_s.value);

  	        if (i && _arr.length === i) break;
  	      }
  	    } catch (err) {
  	      _d = true;
  	      _e = err;
  	    } finally {
  	      try {
  	        if (!_n && _i["return"]) _i["return"]();
  	      } finally {
  	        if (_d) throw _e;
  	      }
  	    }

  	    return _arr;
  	  }

  	  return function (arr, i) {
  	    if (Array.isArray(arr)) {
  	      return arr;
  	    } else if (Symbol.iterator in Object(arr)) {
  	      return sliceIterator(arr, i);
  	    } else {
  	      throw new TypeError("Invalid attempt to destructure non-iterable instance");
  	    }
  	  };
  	}();

  	/*:: import type {ControlPosition, PositionOffsetControlPosition, MouseTouchEvent} from './types';*/


  	var matchesSelectorFunc = '';
  	function matchesSelector(el /*: Node*/, selector /*: string*/) /*: boolean*/ {
  	  if (!matchesSelectorFunc) {
  	    matchesSelectorFunc = findInArray(['matches', 'webkitMatchesSelector', 'mozMatchesSelector', 'msMatchesSelector', 'oMatchesSelector'], function (method) {
  	      // $FlowIgnore: Doesn't think elements are indexable
  	      return isFunction(el[method]);
  	    });
  	  }

  	  // Might not be found entirely (not an Element?) - in that case, bail
  	  // $FlowIgnore: Doesn't think elements are indexable
  	  if (!isFunction(el[matchesSelectorFunc])) return false;

  	  // $FlowIgnore: Doesn't think elements are indexable
  	  return el[matchesSelectorFunc](selector);
  	}

  	// Works up the tree to the draggable itself attempting to match selector.
  	function matchesSelectorAndParentsTo(el /*: Node*/, selector /*: string*/, baseNode /*: Node*/) /*: boolean*/ {
  	  var node = el;
  	  do {
  	    if (matchesSelector(node, selector)) return true;
  	    if (node === baseNode) return false;
  	    node = node.parentNode;
  	  } while (node);

  	  return false;
  	}

  	function addEvent(el /*: ?Node*/, event /*: string*/, handler /*: Function*/) /*: void*/ {
  	  if (!el) {
  	    return;
  	  }
  	  if (el.attachEvent) {
  	    el.attachEvent('on' + event, handler);
  	  } else if (el.addEventListener) {
  	    el.addEventListener(event, handler, true);
  	  } else {
  	    // $FlowIgnore: Doesn't think elements are indexable
  	    el['on' + event] = handler;
  	  }
  	}

  	function removeEvent(el /*: ?Node*/, event /*: string*/, handler /*: Function*/) /*: void*/ {
  	  if (!el) {
  	    return;
  	  }
  	  if (el.detachEvent) {
  	    el.detachEvent('on' + event, handler);
  	  } else if (el.removeEventListener) {
  	    el.removeEventListener(event, handler, true);
  	  } else {
  	    // $FlowIgnore: Doesn't think elements are indexable
  	    el['on' + event] = null;
  	  }
  	}

  	function outerHeight(node /*: HTMLElement*/) /*: number*/ {
  	  // This is deliberately excluding margin for our calculations, since we are using
  	  // offsetTop which is including margin. See getBoundPosition
  	  var height = node.clientHeight;
  	  var computedStyle = node.ownerDocument.defaultView.getComputedStyle(node);
  	  height += int(computedStyle.borderTopWidth);
  	  height += int(computedStyle.borderBottomWidth);
  	  return height;
  	}

  	function outerWidth(node /*: HTMLElement*/) /*: number*/ {
  	  // This is deliberately excluding margin for our calculations, since we are using
  	  // offsetLeft which is including margin. See getBoundPosition
  	  var width = node.clientWidth;
  	  var computedStyle = node.ownerDocument.defaultView.getComputedStyle(node);
  	  width += int(computedStyle.borderLeftWidth);
  	  width += int(computedStyle.borderRightWidth);
  	  return width;
  	}
  	function innerHeight(node /*: HTMLElement*/) /*: number*/ {
  	  var height = node.clientHeight;
  	  var computedStyle = node.ownerDocument.defaultView.getComputedStyle(node);
  	  height -= int(computedStyle.paddingTop);
  	  height -= int(computedStyle.paddingBottom);
  	  return height;
  	}

  	function innerWidth(node /*: HTMLElement*/) /*: number*/ {
  	  var width = node.clientWidth;
  	  var computedStyle = node.ownerDocument.defaultView.getComputedStyle(node);
  	  width -= int(computedStyle.paddingLeft);
  	  width -= int(computedStyle.paddingRight);
  	  return width;
  	}

  	// Get from offsetParent
  	function offsetXYFromParent(evt /*: {clientX: number, clientY: number}*/, offsetParent /*: HTMLElement*/) /*: ControlPosition*/ {
  	  var isBody = offsetParent === offsetParent.ownerDocument.body;
  	  var offsetParentRect = isBody ? { left: 0, top: 0 } : offsetParent.getBoundingClientRect();

  	  var x = evt.clientX + offsetParent.scrollLeft - offsetParentRect.left;
  	  var y = evt.clientY + offsetParent.scrollTop - offsetParentRect.top;

  	  return { x: x, y: y };
  	}

  	function createCSSTransform(controlPos /*: ControlPosition*/, positionOffset /*: PositionOffsetControlPosition*/) /*: Object*/ {
  	  var translation = getTranslation(controlPos, positionOffset, 'px');
  	  return defineProperty({}, browserPrefixToKey('transform', browserPrefix), translation);
  	}

  	function createSVGTransform(controlPos /*: ControlPosition*/, positionOffset /*: PositionOffsetControlPosition*/) /*: string*/ {
  	  var translation = getTranslation(controlPos, positionOffset, '');
  	  return translation;
  	}
  	function getTranslation(_ref2, positionOffset /*: PositionOffsetControlPosition*/, unitSuffix /*: string*/) /*: string*/ {
  	  var x = _ref2.x,
  	      y = _ref2.y;

  	  var translation = 'translate(' + x + unitSuffix + ',' + y + unitSuffix + ')';
  	  if (positionOffset) {
  	    var defaultX = '' + (typeof positionOffset.x === 'string' ? positionOffset.x : positionOffset.x + unitSuffix);
  	    var defaultY = '' + (typeof positionOffset.y === 'string' ? positionOffset.y : positionOffset.y + unitSuffix);
  	    translation = 'translate(' + defaultX + ', ' + defaultY + ')' + translation;
  	  }
  	  return translation;
  	}

  	function getTouch(e /*: MouseTouchEvent*/, identifier /*: number*/) /*: ?{clientX: number, clientY: number}*/ {
  	  return e.targetTouches && findInArray(e.targetTouches, function (t) {
  	    return identifier === t.identifier;
  	  }) || e.changedTouches && findInArray(e.changedTouches, function (t) {
  	    return identifier === t.identifier;
  	  });
  	}

  	function getTouchIdentifier(e /*: MouseTouchEvent*/) /*: ?number*/ {
  	  if (e.targetTouches && e.targetTouches[0]) return e.targetTouches[0].identifier;
  	  if (e.changedTouches && e.changedTouches[0]) return e.changedTouches[0].identifier;
  	}

  	// User-select Hacks:
  	//
  	// Useful for preventing blue highlights all over everything when dragging.

  	// Note we're passing `document` b/c we could be iframed
  	function addUserSelectStyles(doc /*: ?Document*/) {
  	  if (!doc) return;
  	  var styleEl = doc.getElementById('react-draggable-style-el');
  	  if (!styleEl) {
  	    styleEl = doc.createElement('style');
  	    styleEl.type = 'text/css';
  	    styleEl.id = 'react-draggable-style-el';
  	    styleEl.innerHTML = '.react-draggable-transparent-selection *::-moz-selection {all: inherit;}\n';
  	    styleEl.innerHTML += '.react-draggable-transparent-selection *::selection {all: inherit;}\n';
  	    doc.getElementsByTagName('head')[0].appendChild(styleEl);
  	  }
  	  if (doc.body) addClassName(doc.body, 'react-draggable-transparent-selection');
  	}

  	function removeUserSelectStyles(doc /*: ?Document*/) {
  	  try {
  	    if (doc && doc.body) removeClassName(doc.body, 'react-draggable-transparent-selection');
  	    // $FlowIgnore: IE
  	    if (doc.selection) {
  	      // $FlowIgnore: IE
  	      doc.selection.empty();
  	    } else {
  	      window.getSelection().removeAllRanges(); // remove selection caused by scroll
  	    }
  	  } catch (e) {
  	    // probably IE
  	  }
  	}

  	function styleHacks() /*: Object*/ {
  	  var childStyle /*: Object*/ = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

  	  // Workaround IE pointer events; see #51
  	  // https://github.com/mzabriskie/react-draggable/issues/51#issuecomment-103488278
  	  return _extends({
  	    touchAction: 'none'
  	  }, childStyle);
  	}

  	function addClassName(el /*: HTMLElement*/, className /*: string*/) {
  	  if (el.classList) {
  	    el.classList.add(className);
  	  } else {
  	    if (!el.className.match(new RegExp('(?:^|\\s)' + className + '(?!\\S)'))) {
  	      el.className += ' ' + className;
  	    }
  	  }
  	}

  	function removeClassName(el /*: HTMLElement*/, className /*: string*/) {
  	  if (el.classList) {
  	    el.classList.remove(className);
  	  } else {
  	    el.className = el.className.replace(new RegExp('(?:^|\\s)' + className + '(?!\\S)', 'g'), '');
  	  }
  	}

  	/*:: import type Draggable from '../Draggable';*/
  	/*:: import type {Bounds, ControlPosition, DraggableData, MouseTouchEvent} from './types';*/
  	/*:: import type DraggableCore from '../DraggableCore';*/


  	function getBoundPosition(draggable /*: Draggable*/, x /*: number*/, y /*: number*/) /*: [number, number]*/ {
  	  // If no bounds, short-circuit and move on
  	  if (!draggable.props.bounds) return [x, y];

  	  // Clone new bounds
  	  var bounds = draggable.props.bounds;

  	  bounds = typeof bounds === 'string' ? bounds : cloneBounds(bounds);
  	  var node = findDOMNode(draggable);

  	  if (typeof bounds === 'string') {
  	    var ownerDocument = node.ownerDocument;

  	    var ownerWindow = ownerDocument.defaultView;
  	    var boundNode = void 0;
  	    if (bounds === 'parent') {
  	      boundNode = node.parentNode;
  	    } else {
  	      boundNode = ownerDocument.querySelector(bounds);
  	    }
  	    if (!(boundNode instanceof ownerWindow.HTMLElement)) {
  	      throw new Error('Bounds selector "' + bounds + '" could not find an element.');
  	    }
  	    var nodeStyle = ownerWindow.getComputedStyle(node);
  	    var boundNodeStyle = ownerWindow.getComputedStyle(boundNode);
  	    // Compute bounds. This is a pain with padding and offsets but this gets it exactly right.
  	    bounds = {
  	      left: -node.offsetLeft + int(boundNodeStyle.paddingLeft) + int(nodeStyle.marginLeft),
  	      top: -node.offsetTop + int(boundNodeStyle.paddingTop) + int(nodeStyle.marginTop),
  	      right: innerWidth(boundNode) - outerWidth(node) - node.offsetLeft + int(boundNodeStyle.paddingRight) - int(nodeStyle.marginRight),
  	      bottom: innerHeight(boundNode) - outerHeight(node) - node.offsetTop + int(boundNodeStyle.paddingBottom) - int(nodeStyle.marginBottom)
  	    };
  	  }

  	  // Keep x and y below right and bottom limits...
  	  if (isNum(bounds.right)) x = Math.min(x, bounds.right);
  	  if (isNum(bounds.bottom)) y = Math.min(y, bounds.bottom);

  	  // But above left and top limits.
  	  if (isNum(bounds.left)) x = Math.max(x, bounds.left);
  	  if (isNum(bounds.top)) y = Math.max(y, bounds.top);

  	  return [x, y];
  	}

  	function snapToGrid(grid /*: [number, number]*/, pendingX /*: number*/, pendingY /*: number*/) /*: [number, number]*/ {
  	  var x = Math.round(pendingX / grid[0]) * grid[0];
  	  var y = Math.round(pendingY / grid[1]) * grid[1];
  	  return [x, y];
  	}

  	function canDragX(draggable /*: Draggable*/) /*: boolean*/ {
  	  return draggable.props.axis === 'both' || draggable.props.axis === 'x';
  	}

  	function canDragY(draggable /*: Draggable*/) /*: boolean*/ {
  	  return draggable.props.axis === 'both' || draggable.props.axis === 'y';
  	}

  	// Get {x, y} positions from event.
  	function getControlPosition(e /*: MouseTouchEvent*/, touchIdentifier /*: ?number*/, draggableCore /*: DraggableCore*/) /*: ?ControlPosition*/ {
  	  var touchObj = typeof touchIdentifier === 'number' ? getTouch(e, touchIdentifier) : null;
  	  if (typeof touchIdentifier === 'number' && !touchObj) return null; // not the right touch
  	  var node = findDOMNode(draggableCore);
  	  // User can provide an offsetParent if desired.
  	  var offsetParent = draggableCore.props.offsetParent || node.offsetParent || node.ownerDocument.body;
  	  return offsetXYFromParent(touchObj || e, offsetParent);
  	}

  	// Create an data object exposed by <DraggableCore>'s events
  	function createCoreData(draggable /*: DraggableCore*/, x /*: number*/, y /*: number*/) /*: DraggableData*/ {
  	  var state = draggable.state;
  	  var isStart = !isNum(state.lastX);
  	  var node = findDOMNode(draggable);

  	  if (isStart) {
  	    // If this is our first move, use the x and y as last coords.
  	    return {
  	      node: node,
  	      deltaX: 0, deltaY: 0,
  	      lastX: x, lastY: y,
  	      x: x, y: y
  	    };
  	  } else {
  	    // Otherwise calculate proper values.
  	    return {
  	      node: node,
  	      deltaX: x - state.lastX, deltaY: y - state.lastY,
  	      lastX: state.lastX, lastY: state.lastY,
  	      x: x, y: y
  	    };
  	  }
  	}

  	// Create an data exposed by <Draggable>'s events
  	function createDraggableData(draggable /*: Draggable*/, coreData /*: DraggableData*/) /*: DraggableData*/ {
  	  var scale = draggable.props.scale;
  	  return {
  	    node: coreData.node,
  	    x: draggable.state.x + coreData.deltaX / scale,
  	    y: draggable.state.y + coreData.deltaY / scale,
  	    deltaX: coreData.deltaX / scale,
  	    deltaY: coreData.deltaY / scale,
  	    lastX: draggable.state.x,
  	    lastY: draggable.state.y
  	  };
  	}

  	// A lot faster than stringify/parse
  	function cloneBounds(bounds /*: Bounds*/) /*: Bounds*/ {
  	  return {
  	    left: bounds.left,
  	    top: bounds.top,
  	    right: bounds.right,
  	    bottom: bounds.bottom
  	  };
  	}

  	function findDOMNode(draggable /*: Draggable | DraggableCore*/) /*: HTMLElement*/ {
  	  var node = ReactDOM.findDOMNode(draggable);
  	  if (!node) {
  	    throw new Error('<DraggableCore>: Unmounted during event!');
  	  }
  	  // $FlowIgnore we can't assert on HTMLElement due to tests... FIXME
  	  return node;
  	}

  	/*eslint no-console:0*/
  	function log() {
  	}

  	/*:: import type {EventHandler, MouseTouchEvent} from './utils/types';*/


  	// Simple abstraction for dragging events names.
  	/*:: import type {Element as ReactElement} from 'react';*/
  	var eventsFor = {
  	  touch: {
  	    start: 'touchstart',
  	    move: 'touchmove',
  	    stop: 'touchend'
  	  },
  	  mouse: {
  	    start: 'mousedown',
  	    move: 'mousemove',
  	    stop: 'mouseup'
  	  }
  	};

  	// Default to mouse events.
  	var dragEventFor = eventsFor.mouse;

  	/*:: type DraggableCoreState = {
  	  dragging: boolean,
  	  lastX: number,
  	  lastY: number,
  	  touchIdentifier: ?number
  	};*/
  	/*:: export type DraggableBounds = {
  	  left: number,
  	  right: number,
  	  top: number,
  	  bottom: number,
  	};*/
  	/*:: export type DraggableData = {
  	  node: HTMLElement,
  	  x: number, y: number,
  	  deltaX: number, deltaY: number,
  	  lastX: number, lastY: number,
  	};*/
  	/*:: export type DraggableEventHandler = (e: MouseEvent, data: DraggableData) => void;*/
  	/*:: export type ControlPosition = {x: number, y: number};*/
  	/*:: export type PositionOffsetControlPosition = {x: number|string, y: number|string};*/


  	//
  	// Define <DraggableCore>.
  	//
  	// <DraggableCore> is for advanced usage of <Draggable>. It maintains minimal internal state so it can
  	// work well with libraries that require more control over the element.
  	//

  	/*:: export type DraggableCoreProps = {
  	  allowAnyClick: boolean,
  	  cancel: string,
  	  children: ReactElement<any>,
  	  disabled: boolean,
  	  enableUserSelectHack: boolean,
  	  offsetParent: HTMLElement,
  	  grid: [number, number],
  	  handle: string,
  	  onStart: DraggableEventHandler,
  	  onDrag: DraggableEventHandler,
  	  onStop: DraggableEventHandler,
  	  onMouseDown: (e: MouseEvent) => void,
  	};*/

  	var DraggableCore = function (_React$Component) {
  	  inherits(DraggableCore, _React$Component);

  	  function DraggableCore() {
  	    var _ref;

  	    var _temp, _this, _ret;

  	    classCallCheck(this, DraggableCore);

  	    for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
  	      args[_key] = arguments[_key];
  	    }

  	    return _ret = (_temp = (_this = possibleConstructorReturn(this, (_ref = DraggableCore.__proto__ || Object.getPrototypeOf(DraggableCore)).call.apply(_ref, [this].concat(args))), _this), _this.state = {
  	      dragging: false,
  	      // Used while dragging to determine deltas.
  	      lastX: NaN, lastY: NaN,
  	      touchIdentifier: null
  	    }, _this.handleDragStart = function (e) {
  	      // Make it possible to attach event handlers on top of this one.
  	      _this.props.onMouseDown(e);

  	      // Only accept left-clicks.
  	      if (!_this.props.allowAnyClick && typeof e.button === 'number' && e.button !== 0) return false;

  	      // Get nodes. Be sure to grab relative document (could be iframed)
  	      var thisNode = ReactDOM.findDOMNode(_this);
  	      if (!thisNode || !thisNode.ownerDocument || !thisNode.ownerDocument.body) {
  	        throw new Error('<DraggableCore> not mounted on DragStart!');
  	      }
  	      var ownerDocument = thisNode.ownerDocument;

  	      // Short circuit if handle or cancel prop was provided and selector doesn't match.

  	      if (_this.props.disabled || !(e.target instanceof ownerDocument.defaultView.Node) || _this.props.handle && !matchesSelectorAndParentsTo(e.target, _this.props.handle, thisNode) || _this.props.cancel && matchesSelectorAndParentsTo(e.target, _this.props.cancel, thisNode)) {
  	        return;
  	      }

  	      // Set touch identifier in component state if this is a touch event. This allows us to
  	      // distinguish between individual touches on multitouch screens by identifying which
  	      // touchpoint was set to this element.
  	      var touchIdentifier = getTouchIdentifier(e);
  	      _this.setState({ touchIdentifier: touchIdentifier });

  	      // Get the current drag point from the event. This is used as the offset.
  	      var position = getControlPosition(e, touchIdentifier, _this);
  	      if (position == null) return; // not possible but satisfies flow
  	      var x = position.x,
  	          y = position.y;

  	      // Create an event object with all the data parents need to make a decision here.

  	      var coreEvent = createCoreData(_this, x, y);

  	      // Call event handler. If it returns explicit false, cancel.
  	      log('calling', _this.props.onStart);
  	      var shouldUpdate = _this.props.onStart(e, coreEvent);
  	      if (shouldUpdate === false) return;

  	      // Add a style to the body to disable user-select. This prevents text from
  	      // being selected all over the page.
  	      if (_this.props.enableUserSelectHack) addUserSelectStyles(ownerDocument);

  	      // Initiate dragging. Set the current x and y as offsets
  	      // so we know how much we've moved during the drag. This allows us
  	      // to drag elements around even if they have been moved, without issue.
  	      _this.setState({
  	        dragging: true,

  	        lastX: x,
  	        lastY: y
  	      });

  	      // Add events to the document directly so we catch when the user's mouse/touch moves outside of
  	      // this element. We use different events depending on whether or not we have detected that this
  	      // is a touch-capable device.
  	      addEvent(ownerDocument, dragEventFor.move, _this.handleDrag);
  	      addEvent(ownerDocument, dragEventFor.stop, _this.handleDragStop);
  	    }, _this.handleDrag = function (e) {

  	      // Prevent scrolling on mobile devices, like ipad/iphone.
  	      if (e.type === 'touchmove') e.preventDefault();

  	      // Get the current drag point from the event. This is used as the offset.
  	      var position = getControlPosition(e, _this.state.touchIdentifier, _this);
  	      if (position == null) return;
  	      var x = position.x,
  	          y = position.y;

  	      // Snap to grid if prop has been provided

  	      if (Array.isArray(_this.props.grid)) {
  	        var _deltaX = x - _this.state.lastX,
  	            _deltaY = y - _this.state.lastY;

  	        var _snapToGrid = snapToGrid(_this.props.grid, _deltaX, _deltaY);

  	        var _snapToGrid2 = slicedToArray(_snapToGrid, 2);

  	        _deltaX = _snapToGrid2[0];
  	        _deltaY = _snapToGrid2[1];

  	        if (!_deltaX && !_deltaY) return; // skip useless drag
  	        x = _this.state.lastX + _deltaX, y = _this.state.lastY + _deltaY;
  	      }

  	      var coreEvent = createCoreData(_this, x, y);

  	      // Call event handler. If it returns explicit false, trigger end.
  	      var shouldUpdate = _this.props.onDrag(e, coreEvent);
  	      if (shouldUpdate === false) {
  	        try {
  	          // $FlowIgnore
  	          _this.handleDragStop(new MouseEvent('mouseup'));
  	        } catch (err) {
  	          // Old browsers
  	          var event = ((document.createEvent('MouseEvents') /*: any*/) /*: MouseTouchEvent*/);
  	          // I see why this insanity was deprecated
  	          // $FlowIgnore
  	          event.initMouseEvent('mouseup', true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
  	          _this.handleDragStop(event);
  	        }
  	        return;
  	      }

  	      _this.setState({
  	        lastX: x,
  	        lastY: y
  	      });
  	    }, _this.handleDragStop = function (e) {
  	      if (!_this.state.dragging) return;

  	      var position = getControlPosition(e, _this.state.touchIdentifier, _this);
  	      if (position == null) return;
  	      var x = position.x,
  	          y = position.y;

  	      var coreEvent = createCoreData(_this, x, y);

  	      var thisNode = ReactDOM.findDOMNode(_this);
  	      if (thisNode) {
  	        // Remove user-select hack
  	        if (_this.props.enableUserSelectHack) removeUserSelectStyles(thisNode.ownerDocument);
  	      }

  	      // Reset the el.
  	      _this.setState({
  	        dragging: false,
  	        lastX: NaN,
  	        lastY: NaN
  	      });

  	      // Call event handler
  	      _this.props.onStop(e, coreEvent);

  	      if (thisNode) {
  	        removeEvent(thisNode.ownerDocument, dragEventFor.move, _this.handleDrag);
  	        removeEvent(thisNode.ownerDocument, dragEventFor.stop, _this.handleDragStop);
  	      }
  	    }, _this.onMouseDown = function (e) {
  	      dragEventFor = eventsFor.mouse; // on touchscreen laptops we could switch back to mouse

  	      return _this.handleDragStart(e);
  	    }, _this.onMouseUp = function (e) {
  	      dragEventFor = eventsFor.mouse;

  	      return _this.handleDragStop(e);
  	    }, _this.onTouchStart = function (e) {
  	      // We're on a touch device now, so change the event handlers
  	      dragEventFor = eventsFor.touch;

  	      return _this.handleDragStart(e);
  	    }, _this.onTouchEnd = function (e) {
  	      // We're on a touch device now, so change the event handlers
  	      dragEventFor = eventsFor.touch;

  	      return _this.handleDragStop(e);
  	    }, _temp), possibleConstructorReturn(_this, _ret);
  	  }

  	  createClass(DraggableCore, [{
  	    key: 'componentWillUnmount',
  	    value: function componentWillUnmount() {
  	      // Remove any leftover event handlers. Remove both touch and mouse handlers in case
  	      // some browser quirk caused a touch event to fire during a mouse move, or vice versa.
  	      var thisNode = ReactDOM.findDOMNode(this);
  	      if (thisNode) {
  	        var ownerDocument = thisNode.ownerDocument;

  	        removeEvent(ownerDocument, eventsFor.mouse.move, this.handleDrag);
  	        removeEvent(ownerDocument, eventsFor.touch.move, this.handleDrag);
  	        removeEvent(ownerDocument, eventsFor.mouse.stop, this.handleDragStop);
  	        removeEvent(ownerDocument, eventsFor.touch.stop, this.handleDragStop);
  	        if (this.props.enableUserSelectHack) removeUserSelectStyles(ownerDocument);
  	      }
  	    }

  	    // Same as onMouseDown (start drag), but now consider this a touch device.

  	  }, {
  	    key: 'render',
  	    value: function render() {
  	      // Reuse the child provided
  	      // This makes it flexible to use whatever element is wanted (div, ul, etc)
  	      return React.cloneElement(React.Children.only(this.props.children), {
  	        style: styleHacks(this.props.children.props.style),

  	        // Note: mouseMove handler is attached to document so it will still function
  	        // when the user drags quickly and leaves the bounds of the element.
  	        onMouseDown: this.onMouseDown,
  	        onTouchStart: this.onTouchStart,
  	        onMouseUp: this.onMouseUp,
  	        onTouchEnd: this.onTouchEnd
  	      });
  	    }
  	  }]);
  	  return DraggableCore;
  	}(React.Component);

  	DraggableCore.displayName = 'DraggableCore';
  	DraggableCore.propTypes = {
  	  /**
  	   * `allowAnyClick` allows dragging using any mouse button.
  	   * By default, we only accept the left button.
  	   *
  	   * Defaults to `false`.
  	   */
  	  allowAnyClick: propTypes.bool,

  	  /**
  	   * `disabled`, if true, stops the <Draggable> from dragging. All handlers,
  	   * with the exception of `onMouseDown`, will not fire.
  	   */
  	  disabled: propTypes.bool,

  	  /**
  	   * By default, we add 'user-select:none' attributes to the document body
  	   * to prevent ugly text selection during drag. If this is causing problems
  	   * for your app, set this to `false`.
  	   */
  	  enableUserSelectHack: propTypes.bool,

  	  /**
  	   * `offsetParent`, if set, uses the passed DOM node to compute drag offsets
  	   * instead of using the parent node.
  	   */
  	  offsetParent: function offsetParent(props /*: DraggableCoreProps*/, propName /*: $Keys<DraggableCoreProps>*/) {
  	    if (props[propName] && props[propName].nodeType !== 1) {
  	      throw new Error('Draggable\'s offsetParent must be a DOM Node.');
  	    }
  	  },

  	  /**
  	   * `grid` specifies the x and y that dragging should snap to.
  	   */
  	  grid: propTypes.arrayOf(propTypes.number),

  	  /**
  	   * `scale` specifies the scale of the area you are dragging inside of. It allows
  	   * the drag deltas to scale correctly with how far zoomed in/out you are.
  	   */
  	  scale: propTypes.number,

  	  /**
  	   * `handle` specifies a selector to be used as the handle that initiates drag.
  	   *
  	   * Example:
  	   *
  	   * ```jsx
  	   *   let App = React.createClass({
  	   *       render: function () {
  	   *         return (
  	   *            <Draggable handle=".handle">
  	   *              <div>
  	   *                  <div className="handle">Click me to drag</div>
  	   *                  <div>This is some other content</div>
  	   *              </div>
  	   *           </Draggable>
  	   *         );
  	   *       }
  	   *   });
  	   * ```
  	   */
  	  handle: propTypes.string,

  	  /**
  	   * `cancel` specifies a selector to be used to prevent drag initialization.
  	   *
  	   * Example:
  	   *
  	   * ```jsx
  	   *   let App = React.createClass({
  	   *       render: function () {
  	   *           return(
  	   *               <Draggable cancel=".cancel">
  	   *                   <div>
  	   *                     <div className="cancel">You can't drag from here</div>
  	   *                     <div>Dragging here works fine</div>
  	   *                   </div>
  	   *               </Draggable>
  	   *           );
  	   *       }
  	   *   });
  	   * ```
  	   */
  	  cancel: propTypes.string,

  	  /**
  	   * Called when dragging starts.
  	   * If this function returns the boolean false, dragging will be canceled.
  	   */
  	  onStart: propTypes.func,

  	  /**
  	   * Called while dragging.
  	   * If this function returns the boolean false, dragging will be canceled.
  	   */
  	  onDrag: propTypes.func,

  	  /**
  	   * Called when dragging stops.
  	   * If this function returns the boolean false, the drag will remain active.
  	   */
  	  onStop: propTypes.func,

  	  /**
  	   * A workaround option which can be passed if onMouseDown needs to be accessed,
  	   * since it'll always be blocked (as there is internal use of onMouseDown)
  	   */
  	  onMouseDown: propTypes.func,

  	  /**
  	   * These properties should be defined on the child, not here.
  	   */
  	  className: dontSetMe,
  	  style: dontSetMe,
  	  transform: dontSetMe
  	};
  	DraggableCore.defaultProps = {
  	  allowAnyClick: false, // by default only accept left click
  	  cancel: null,
  	  disabled: false,
  	  enableUserSelectHack: true,
  	  offsetParent: null,
  	  handle: null,
  	  grid: null,
  	  transform: null,
  	  onStart: function onStart() {},
  	  onDrag: function onDrag() {},
  	  onStop: function onStop() {},
  	  onMouseDown: function onMouseDown() {}
  	};

  	/*:: import type {DraggableEventHandler} from './utils/types';*/
  	/*:: import type {Element as ReactElement} from 'react';*/
  	/*:: type DraggableState = {
  	  dragging: boolean,
  	  dragged: boolean,
  	  x: number, y: number,
  	  slackX: number, slackY: number,
  	  isElementSVG: boolean
  	};*/


  	//
  	// Define <Draggable>
  	//

  	/*:: export type DraggableProps = {
  	  ...$Exact<DraggableCoreProps>,
  	  axis: 'both' | 'x' | 'y' | 'none',
  	  bounds: DraggableBounds | string | false,
  	  defaultClassName: string,
  	  defaultClassNameDragging: string,
  	  defaultClassNameDragged: string,
  	  defaultPosition: ControlPosition,
  	  positionOffset: PositionOffsetControlPosition,
  	  position: ControlPosition,
  	  scale: number
  	};*/

  	var Draggable = function (_React$Component) {
  	  inherits(Draggable, _React$Component);

  	  function Draggable(props /*: DraggableProps*/) {
  	    classCallCheck(this, Draggable);

  	    var _this = possibleConstructorReturn(this, (Draggable.__proto__ || Object.getPrototypeOf(Draggable)).call(this, props));

  	    _this.onDragStart = function (e, coreData) {

  	      // Short-circuit if user's callback killed it.
  	      var shouldStart = _this.props.onStart(e, createDraggableData(_this, coreData));
  	      // Kills start event on core as well, so move handlers are never bound.
  	      if (shouldStart === false) return false;

  	      _this.setState({ dragging: true, dragged: true });
  	    };

  	    _this.onDrag = function (e, coreData) {
  	      if (!_this.state.dragging) return false;

  	      var uiData = createDraggableData(_this, coreData);

  	      var newState /*: $Shape<DraggableState>*/ = {
  	        x: uiData.x,
  	        y: uiData.y
  	      };

  	      // Keep within bounds.
  	      if (_this.props.bounds) {
  	        // Save original x and y.
  	        var _x = newState.x,
  	            _y = newState.y;

  	        // Add slack to the values used to calculate bound position. This will ensure that if
  	        // we start removing slack, the element won't react to it right away until it's been
  	        // completely removed.

  	        newState.x += _this.state.slackX;
  	        newState.y += _this.state.slackY;

  	        // Get bound position. This will ceil/floor the x and y within the boundaries.

  	        var _getBoundPosition = getBoundPosition(_this, newState.x, newState.y),
  	            _getBoundPosition2 = slicedToArray(_getBoundPosition, 2),
  	            newStateX = _getBoundPosition2[0],
  	            newStateY = _getBoundPosition2[1];

  	        newState.x = newStateX;
  	        newState.y = newStateY;

  	        // Recalculate slack by noting how much was shaved by the boundPosition handler.
  	        newState.slackX = _this.state.slackX + (_x - newState.x);
  	        newState.slackY = _this.state.slackY + (_y - newState.y);

  	        // Update the event we fire to reflect what really happened after bounds took effect.
  	        uiData.x = newState.x;
  	        uiData.y = newState.y;
  	        uiData.deltaX = newState.x - _this.state.x;
  	        uiData.deltaY = newState.y - _this.state.y;
  	      }

  	      // Short-circuit if user's callback killed it.
  	      var shouldUpdate = _this.props.onDrag(e, uiData);
  	      if (shouldUpdate === false) return false;

  	      _this.setState(newState);
  	    };

  	    _this.onDragStop = function (e, coreData) {
  	      if (!_this.state.dragging) return false;

  	      // Short-circuit if user's callback killed it.
  	      var shouldStop = _this.props.onStop(e, createDraggableData(_this, coreData));
  	      if (shouldStop === false) return false;

  	      var newState /*: $Shape<DraggableState>*/ = {
  	        dragging: false,
  	        slackX: 0,
  	        slackY: 0
  	      };

  	      // If this is a controlled component, the result of this operation will be to
  	      // revert back to the old position. We expect a handler on `onDragStop`, at the least.
  	      var controlled = Boolean(_this.props.position);
  	      if (controlled) {
  	        var _this$props$position = _this.props.position,
  	            _x2 = _this$props$position.x,
  	            _y2 = _this$props$position.y;

  	        newState.x = _x2;
  	        newState.y = _y2;
  	      }

  	      _this.setState(newState);
  	    };

  	    _this.state = {
  	      // Whether or not we are currently dragging.
  	      dragging: false,

  	      // Whether or not we have been dragged before.
  	      dragged: false,

  	      // Current transform x and y.
  	      x: props.position ? props.position.x : props.defaultPosition.x,
  	      y: props.position ? props.position.y : props.defaultPosition.y,

  	      // Used for compensating for out-of-bounds drags
  	      slackX: 0, slackY: 0,

  	      // Can only determine if SVG after mounting
  	      isElementSVG: false
  	    };

  	    if (props.position && !(props.onDrag || props.onStop)) {
  	      // eslint-disable-next-line no-console
  	      console.warn('A `position` was applied to this <Draggable>, without drag handlers. This will make this ' + 'component effectively undraggable. Please attach `onDrag` or `onStop` handlers so you can adjust the ' + '`position` of this element.');
  	    }
  	    return _this;
  	  }

  	  createClass(Draggable, [{
  	    key: 'componentDidMount',
  	    value: function componentDidMount() {
  	      // Check to see if the element passed is an instanceof SVGElement
  	      if (typeof window.SVGElement !== 'undefined' && ReactDOM.findDOMNode(this) instanceof window.SVGElement) {
  	        this.setState({ isElementSVG: true });
  	      }
  	    }
  	  }, {
  	    key: 'componentWillReceiveProps',
  	    value: function componentWillReceiveProps(nextProps /*: Object*/) {
  	      // Set x/y if position has changed
  	      if (nextProps.position && (!this.props.position || nextProps.position.x !== this.props.position.x || nextProps.position.y !== this.props.position.y)) {
  	        this.setState({ x: nextProps.position.x, y: nextProps.position.y });
  	      }
  	    }
  	  }, {
  	    key: 'componentWillUnmount',
  	    value: function componentWillUnmount() {
  	      this.setState({ dragging: false }); // prevents invariant if unmounted while dragging
  	    }
  	  }, {
  	    key: 'render',
  	    value: function render() /*: ReactElement<any>*/ {
  	      var _classNames;

  	      var style = {},
  	          svgTransform = null;

  	      // If this is controlled, we don't want to move it - unless it's dragging.
  	      var controlled = Boolean(this.props.position);
  	      var draggable = !controlled || this.state.dragging;

  	      var position = this.props.position || this.props.defaultPosition;
  	      var transformOpts = {
  	        // Set left if horizontal drag is enabled
  	        x: canDragX(this) && draggable ? this.state.x : position.x,

  	        // Set top if vertical drag is enabled
  	        y: canDragY(this) && draggable ? this.state.y : position.y
  	      };

  	      // If this element was SVG, we use the `transform` attribute.
  	      if (this.state.isElementSVG) {
  	        svgTransform = createSVGTransform(transformOpts, this.props.positionOffset);
  	      } else {
  	        // Add a CSS transform to move the element around. This allows us to move the element around
  	        // without worrying about whether or not it is relatively or absolutely positioned.
  	        // If the item you are dragging already has a transform set, wrap it in a <span> so <Draggable>
  	        // has a clean slate.
  	        style = createCSSTransform(transformOpts, this.props.positionOffset);
  	      }

  	      var _props = this.props,
  	          defaultClassName = _props.defaultClassName,
  	          defaultClassNameDragging = _props.defaultClassNameDragging,
  	          defaultClassNameDragged = _props.defaultClassNameDragged;


  	      var children = React.Children.only(this.props.children);

  	      // Mark with class while dragging
  	      var className = classnames(children.props.className || '', defaultClassName, (_classNames = {}, defineProperty(_classNames, defaultClassNameDragging, this.state.dragging), defineProperty(_classNames, defaultClassNameDragged, this.state.dragged), _classNames));

  	      // Reuse the child provided
  	      // This makes it flexible to use whatever element is wanted (div, ul, etc)
  	      return React.createElement(
  	        DraggableCore,
  	        _extends({}, this.props, { onStart: this.onDragStart, onDrag: this.onDrag, onStop: this.onDragStop }),
  	        React.cloneElement(children, {
  	          className: className,
  	          style: _extends({}, children.props.style, style),
  	          transform: svgTransform
  	        })
  	      );
  	    }
  	  }]);
  	  return Draggable;
  	}(React.Component);

  	Draggable.displayName = 'Draggable';
  	Draggable.propTypes = _extends({}, DraggableCore.propTypes, {

  	  /**
  	   * `axis` determines which axis the draggable can move.
  	   *
  	   *  Note that all callbacks will still return data as normal. This only
  	   *  controls flushing to the DOM.
  	   *
  	   * 'both' allows movement horizontally and vertically.
  	   * 'x' limits movement to horizontal axis.
  	   * 'y' limits movement to vertical axis.
  	   * 'none' limits all movement.
  	   *
  	   * Defaults to 'both'.
  	   */
  	  axis: propTypes.oneOf(['both', 'x', 'y', 'none']),

  	  /**
  	   * `bounds` determines the range of movement available to the element.
  	   * Available values are:
  	   *
  	   * 'parent' restricts movement within the Draggable's parent node.
  	   *
  	   * Alternatively, pass an object with the following properties, all of which are optional:
  	   *
  	   * {left: LEFT_BOUND, right: RIGHT_BOUND, bottom: BOTTOM_BOUND, top: TOP_BOUND}
  	   *
  	   * All values are in px.
  	   *
  	   * Example:
  	   *
  	   * ```jsx
  	   *   let App = React.createClass({
  	   *       render: function () {
  	   *         return (
  	   *            <Draggable bounds={{right: 300, bottom: 300}}>
  	   *              <div>Content</div>
  	   *           </Draggable>
  	   *         );
  	   *       }
  	   *   });
  	   * ```
  	   */
  	  bounds: propTypes.oneOfType([propTypes.shape({
  	    left: propTypes.number,
  	    right: propTypes.number,
  	    top: propTypes.number,
  	    bottom: propTypes.number
  	  }), propTypes.string, propTypes.oneOf([false])]),

  	  defaultClassName: propTypes.string,
  	  defaultClassNameDragging: propTypes.string,
  	  defaultClassNameDragged: propTypes.string,

  	  /**
  	   * `defaultPosition` specifies the x and y that the dragged item should start at
  	   *
  	   * Example:
  	   *
  	   * ```jsx
  	   *      let App = React.createClass({
  	   *          render: function () {
  	   *              return (
  	   *                  <Draggable defaultPosition={{x: 25, y: 25}}>
  	   *                      <div>I start with transformX: 25px and transformY: 25px;</div>
  	   *                  </Draggable>
  	   *              );
  	   *          }
  	   *      });
  	   * ```
  	   */
  	  defaultPosition: propTypes.shape({
  	    x: propTypes.number,
  	    y: propTypes.number
  	  }),
  	  positionOffset: propTypes.shape({
  	    x: propTypes.oneOfType([propTypes.number, propTypes.string]),
  	    y: propTypes.oneOfType([propTypes.number, propTypes.string])
  	  }),

  	  /**
  	   * `position`, if present, defines the current position of the element.
  	   *
  	   *  This is similar to how form elements in React work - if no `position` is supplied, the component
  	   *  is uncontrolled.
  	   *
  	   * Example:
  	   *
  	   * ```jsx
  	   *      let App = React.createClass({
  	   *          render: function () {
  	   *              return (
  	   *                  <Draggable position={{x: 25, y: 25}}>
  	   *                      <div>I start with transformX: 25px and transformY: 25px;</div>
  	   *                  </Draggable>
  	   *              );
  	   *          }
  	   *      });
  	   * ```
  	   */
  	  position: propTypes.shape({
  	    x: propTypes.number,
  	    y: propTypes.number
  	  }),

  	  /**
  	   * These properties should be defined on the child, not here.
  	   */
  	  className: dontSetMe,
  	  style: dontSetMe,
  	  transform: dontSetMe
  	});
  	Draggable.defaultProps = _extends({}, DraggableCore.defaultProps, {
  	  axis: 'both',
  	  bounds: false,
  	  defaultClassName: 'react-draggable',
  	  defaultClassNameDragging: 'react-draggable-dragging',
  	  defaultClassNameDragged: 'react-draggable-dragged',
  	  defaultPosition: { x: 0, y: 0 },
  	  position: null,
  	  scale: 1
  	});

  	// Previous versions of this lib exported <Draggable> as the root export. As to not break
  	// them, or TypeScript, we export *both* as the root and as 'default'.
  	// See https://github.com/mzabriskie/react-draggable/pull/254
  	// and https://github.com/mzabriskie/react-draggable/issues/266
  	Draggable.default = Draggable;
  	Draggable.DraggableCore = DraggableCore;

  	return Draggable;

  })));

  });

  function getStartPositions(elements) {
    return elements.filter(isNode).reduce(function (res, node) {
      var startPosition = {
        x: node.__rg.position.x || node.position.x,
        y: node.__rg.position.y || node.position.x
      };
      res[node.id] = startPosition;
      return res;
    }, {});
  }

  var NodesSelection = React.memo(function () {
    var _useState = React.useState({
      x: 0,
      y: 0
    }),
        _useState2 = _slicedToArray(_useState, 2),
        offset = _useState2[0],
        setOffset = _useState2[1];

    var _useState3 = React.useState({}),
        _useState4 = _slicedToArray(_useState3, 2),
        startPositions = _useState4[0],
        setStartPositions = _useState4[1];

    var state = useStoreState(function (s) {
      return {
        transform: s.transform,
        selectedNodesBbox: s.selectedNodesBbox,
        selectedElements: s.selectedElements
      };
    });
    var updateNodePos = useStoreActions(function (a) {
      return a.updateNodePos;
    });

    var _state$transform = _slicedToArray(state.transform, 3),
        x = _state$transform[0],
        y = _state$transform[1],
        k = _state$transform[2];

    var position = state.selectedNodesBbox;

    var onStart = function onStart(evt) {
      var scaledClient = {
        x: evt.clientX * (1 / k),
        y: evt.clientY * (1 / k)
      };
      var offsetX = scaledClient.x - position.x - x;
      var offsetY = scaledClient.y - position.y - y;
      var startPositions = getStartPositions(state.selectedElements);
      setOffset({
        x: offsetX,
        y: offsetY
      });
      setStartPositions(startPositions);
    };

    var onDrag = function onDrag(evt) {
      var scaledClient = {
        x: evt.clientX * (1 / k),
        y: evt.clientY * (1 / k)
      };
      state.selectedElements.filter(isNode).forEach(function (node) {
        updateNodePos({
          id: node.id,
          pos: {
            x: startPositions[node.id].x + scaledClient.x - position.x - offset.x - x,
            y: startPositions[node.id].y + scaledClient.y - position.y - offset.y - y
          }
        });
      });
    };

    return React__default.createElement("div", {
      className: "react-flow__nodesselection",
      style: {
        transform: "translate(".concat(x, "px,").concat(y, "px) scale(").concat(k, ")")
      }
    }, React__default.createElement(reactDraggable, {
      scale: k,
      onStart: onStart,
      onDrag: onDrag
    }, React__default.createElement("div", {
      className: "react-flow__nodesselection-rect",
      style: {
        width: state.selectedNodesBbox.width,
        height: state.selectedNodesBbox.height,
        top: state.selectedNodesBbox.y,
        left: state.selectedNodesBbox.x
      }
    })));
  });

  var isFunction = function isFunction(obj) {
    return !!(obj && obj.constructor && obj.call && obj.apply);
  };
  var inInputDOMNode = function inInputDOMNode(e) {
    return e && e.target && ['INPUT', 'SELECT', 'TEXTAREA'].includes(e.target.nodeName);
  };
  var getDimensions = function getDimensions() {
    var node = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
    return {
      width: node.offsetWidth,
      height: node.offsetHeight
    };
  };

  function useKeyPress(keyCode) {
    var _useState = React.useState(false),
        _useState2 = _slicedToArray(_useState, 2),
        keyPressed = _useState2[0],
        setKeyPressed = _useState2[1];

    function downHandler(evt) {
      if (evt.keyCode === keyCode && !inInputDOMNode(evt.target)) {
        setKeyPressed(true);
      }
    }

    var upHandler = function upHandler(evt) {
      if (evt.keyCode === keyCode && !inInputDOMNode(evt.target)) {
        setKeyPressed(false);
      }
    };

    React.useEffect(function () {
      window.addEventListener('keydown', downHandler);
      window.addEventListener('keyup', upHandler);
      return function () {
        window.removeEventListener('keydown', downHandler);
        window.removeEventListener('keyup', upHandler);
      };
    }, []);
    return keyPressed;
  }

  var d3ZoomInstance = zoom().scaleExtent([0.5, 2]);
  function useD3Zoom(zoomPane, onMove, shiftPressed) {
    var state = useStoreState(function (s) {
      return {
        transform: s.transform,
        d3Selection: s.d3Selection,
        d3Zoom: s.d3Zoom,
        edges: s.edged,
        d3Initialised: s.d3Initialised,
        nodesSelectionActive: s.nodesSelectionActive
      };
    });
    var initD3 = useStoreActions(function (actions) {
      return actions.initD3;
    });
    var updateTransform = useStoreActions(function (actions) {
      return actions.updateTransform;
    });
    React.useEffect(function () {
      var selection = select(zoomPane.current).call(d3ZoomInstance);
      initD3({
        zoom: d3ZoomInstance,
        selection: selection
      });
    }, []);
    React.useEffect(function () {
      if (shiftPressed) {
        d3ZoomInstance.on('zoom', null);
      } else {
        d3ZoomInstance.on('zoom', function () {
          if (event.sourceEvent && event.sourceEvent.target !== zoomPane.current) {
            return false;
          }

          updateTransform(event.transform);
          onMove();
        });

        if (state.d3Selection) {
          // we need to restore the graph transform otherwise d3 zoom transform and graph transform are not synced
          var graphTransform = identity$1.translate(state.transform[0], state.transform[1]).scale(state.transform[2]);
          state.d3Selection.call(state.d3Zoom.transform, graphTransform);
        }
      }

      return function () {
        d3ZoomInstance.on('zoom', null);
      };
    }, [shiftPressed]);
  }

  var useGlobalKeyHandler = (function (_ref) {
    var deleteKeyCode = _ref.deleteKeyCode,
        onElementsRemove = _ref.onElementsRemove;
    var state = useStoreState(function (s) {
      return {
        selectedElements: s.selectedElements,
        edges: s.edges
      };
    });
    var setNodesSelection = useStoreActions(function (a) {
      return a.setNodesSelection;
    });
    var deleteKeyPressed = useKeyPress(deleteKeyCode);
    React.useEffect(function () {
      if (deleteKeyPressed && state.selectedElements.length) {
        var elementsToRemove = state.selectedElements; // we also want to remove the edges if only one node is selected

        if (state.selectedElements.length === 1 && !isEdge(state.selectedElements[0])) {
          var connectedEdges = getConnectedEdges(state.selectedElements, state.edges);
          elementsToRemove = [].concat(_toConsumableArray(state.selectedElements), _toConsumableArray(connectedEdges));
        }

        onElementsRemove(elementsToRemove);
        setNodesSelection({
          isActive: false
        });
      }
    }, [deleteKeyPressed]);
    return null;
  });

  var useElementUpdater = function useElementUpdater(_ref) {
    var elements = _ref.elements;
    var state = useStoreState(function (s) {
      return {
        nodes: s.nodes,
        edges: s.edges,
        transform: s.transform
      };
    });
    var setNodes = useStoreActions(function (a) {
      return a.setNodes;
    });
    var setEdges = useStoreActions(function (a) {
      return a.setEdges;
    });
    React.useEffect(function () {
      var nodes = elements.filter(isNode);
      var edges = elements.filter(isEdge).map(parseElement);
      var nextNodes = nodes.map(function (propNode) {
        var existingNode = state.nodes.find(function (n) {
          return n.id === propNode.id;
        });

        if (existingNode) {
          var data = !fastDeepEqual(existingNode.data, propNode.data) ? _objectSpread2$1({}, existingNode.data, {}, propNode.data) : existingNode.data;
          return _objectSpread2$1({}, existingNode, {
            data: data
          });
        }

        return parseElement(propNode, state.transform);
      });
      var nodesChanged = !fastDeepEqual(state.nodes, nextNodes);
      var edgesChanged = !fastDeepEqual(state.edges, edges);

      if (nodesChanged) {
        setNodes(nextNodes);
      }

      if (edgesChanged) {
        setEdges(edges);
      }
    });
    return null;
  };

  var GraphView = React.memo(function (_ref) {
    var nodeTypes = _ref.nodeTypes,
        edgeTypes = _ref.edgeTypes,
        onMove = _ref.onMove,
        onLoad = _ref.onLoad,
        onElementClick = _ref.onElementClick,
        onNodeDragStop = _ref.onNodeDragStop,
        connectionLineType = _ref.connectionLineType,
        connectionLineStyle = _ref.connectionLineStyle,
        selectionKeyCode = _ref.selectionKeyCode,
        onElementsRemove = _ref.onElementsRemove,
        deleteKeyCode = _ref.deleteKeyCode,
        elements = _ref.elements,
        onConnect = _ref.onConnect,
        gridColor = _ref.gridColor,
        showGrid = _ref.showGrid,
        gridGap = _ref.gridGap;
    var zoomPane = React.useRef();
    var rendererNode = React.useRef();
    var state = useStoreState(function (s) {
      return {
        width: s.width,
        height: s.height,
        nodes: s.nodes,
        edges: s.edges,
        d3Initialised: s.d3Initialised,
        nodesSelectionActive: s.nodesSelectionActive
      };
    });
    var updateSize = useStoreActions(function (actions) {
      return actions.updateSize;
    });
    var setNodesSelection = useStoreActions(function (actions) {
      return actions.setNodesSelection;
    });
    var setOnConnect = useStoreActions(function (a) {
      return a.setOnConnect;
    });
    var selectionKeyPressed = useKeyPress(selectionKeyCode);

    var onZoomPaneClick = function onZoomPaneClick() {
      return setNodesSelection({
        isActive: false
      });
    };

    var updateDimensions = function updateDimensions() {
      var size = getDimensions(rendererNode.current);
      updateSize(size);
    };

    React.useEffect(function () {
      updateDimensions();
      setOnConnect(onConnect);
      window.onresize = updateDimensions;
      return function () {
        window.onresize = null;
      };
    }, []);
    useD3Zoom(zoomPane, onMove, selectionKeyPressed);
    React.useEffect(function () {
      if (state.d3Initialised) {
        onLoad({
          fitView: fitView,
          zoomIn: zoomIn,
          zoomOut: zoomOut
        });
      }
    }, [state.d3Initialised]);
    useGlobalKeyHandler({
      onElementsRemove: onElementsRemove,
      deleteKeyCode: deleteKeyCode
    });
    useElementUpdater({
      elements: elements
    });
    return React__default.createElement("div", {
      className: "react-flow__renderer",
      ref: rendererNode
    }, showGrid && React__default.createElement(GridRenderer, {
      gap: gridGap,
      strokeColor: gridColor
    }), React__default.createElement(NodeRenderer, {
      nodeTypes: nodeTypes,
      onElementClick: onElementClick,
      onNodeDragStop: onNodeDragStop
    }), React__default.createElement(EdgeRenderer, {
      width: state.width,
      height: state.height,
      edgeTypes: edgeTypes,
      onElementClick: onElementClick,
      connectionLineType: connectionLineType,
      connectionLineStyle: connectionLineStyle
    }), selectionKeyPressed && React__default.createElement(UserSelection, null), state.nodesSelectionActive && React__default.createElement(NodesSelection, null), React__default.createElement("div", {
      className: "react-flow__zoompane",
      onClick: onZoomPaneClick,
      ref: zoomPane
    }));
  });
  GraphView.displayName = 'GraphView';

  function _onMouseDown(evt, _ref) {
    var nodeId = _ref.nodeId,
        setSourceId = _ref.setSourceId,
        setPosition = _ref.setPosition,
        onConnect = _ref.onConnect,
        isTarget = _ref.isTarget,
        isValidConnection = _ref.isValidConnection;
    var containerBounds = document.querySelector('.react-flow').getBoundingClientRect();
    var recentHoveredHandle = null;
    setPosition({
      x: evt.clientX - containerBounds.x,
      y: evt.clientY - containerBounds.y
    });
    setSourceId(nodeId);

    function resetRecentHandle() {
      if (recentHoveredHandle) {
        recentHoveredHandle.classList.remove('valid');
        recentHoveredHandle.classList.remove('connecting');
      }
    } // checks if element below mouse is a handle and returns connection in form of an object { source: 123, target: 312 }


    function checkElementBelowIsValid(evt) {
      var elementBelow = document.elementFromPoint(evt.clientX, evt.clientY);
      var result = {
        elementBelow: elementBelow,
        isValid: false,
        connection: null,
        isHoveringHandle: false
      };

      if (elementBelow && (elementBelow.classList.contains('target') || elementBelow.classList.contains('source'))) {
        var connection = null;

        if (isTarget) {
          var sourceId = elementBelow.getAttribute('data-nodeid');
          connection = {
            source: sourceId,
            target: nodeId
          };
        } else {
          var targetId = elementBelow.getAttribute('data-nodeid');
          connection = {
            source: nodeId,
            target: targetId
          };
        }

        var isValid = isValidConnection(connection);
        result.connection = connection;
        result.isValid = isValid;
        result.isHoveringHandle = true;
      }

      return result;
    }

    function onMouseMove(evt) {
      setPosition({
        x: evt.clientX - containerBounds.x,
        y: evt.clientY - containerBounds.y
      });

      var _checkElementBelowIsV = checkElementBelowIsValid(evt),
          connection = _checkElementBelowIsV.connection,
          elementBelow = _checkElementBelowIsV.elementBelow,
          isValid = _checkElementBelowIsV.isValid,
          isHoveringHandle = _checkElementBelowIsV.isHoveringHandle;

      if (!isHoveringHandle) {
        return resetRecentHandle();
      }

      var isOwnHandle = connection.source === connection.target;

      if (!isOwnHandle) {
        recentHoveredHandle = elementBelow;
        elementBelow.classList.add('connecting');
        elementBelow.classList.toggle('valid', isValid);
      }
    }

    function onMouseUp(evt) {
      var _checkElementBelowIsV2 = checkElementBelowIsValid(evt),
          connection = _checkElementBelowIsV2.connection,
          isValid = _checkElementBelowIsV2.isValid;

      if (isValid) {
        onConnect(connection);
      }

      resetRecentHandle();
      setSourceId(null);
      document.removeEventListener('mousemove', onMouseMove);
      document.removeEventListener('mouseup', onMouseUp);
    }

    document.addEventListener('mousemove', onMouseMove);
    document.addEventListener('mouseup', onMouseUp);
  }

  var BaseHandle = React.memo(function (_ref2) {
    var type = _ref2.type,
        nodeId = _ref2.nodeId,
        onConnect = _ref2.onConnect,
        position = _ref2.position,
        setSourceId = _ref2.setSourceId,
        setPosition = _ref2.setPosition,
        className = _ref2.className,
        _ref2$id = _ref2.id,
        id = _ref2$id === void 0 ? false : _ref2$id,
        isValidConnection = _ref2.isValidConnection,
        rest = _objectWithoutProperties(_ref2, ["type", "nodeId", "onConnect", "position", "setSourceId", "setPosition", "className", "id", "isValidConnection"]);

    var isTarget = type === 'target';
    var handleClasses = classnames('react-flow__handle', className, position, {
      source: !isTarget,
      target: isTarget
    });
    var nodeIdWithHandleId = id ? "".concat(nodeId, "__").concat(id) : nodeId;
    return React__default.createElement("div", _extends$1({
      "data-nodeid": nodeIdWithHandleId,
      "data-handlepos": position,
      className: handleClasses,
      onMouseDown: function onMouseDown(evt) {
        return _onMouseDown(evt, {
          nodeId: nodeIdWithHandleId,
          setSourceId: setSourceId,
          setPosition: setPosition,
          onConnect: onConnect,
          isTarget: isTarget,
          isValidConnection: isValidConnection
        });
      }
    }, rest));
  });
  BaseHandle.displayName = 'BaseHandle';
  BaseHandle.whyDidYouRender = false;

  var NodeIdContext = React.createContext(null);
  var Provider = NodeIdContext.Provider;
  var Consumer = NodeIdContext.Consumer;
  Provider.displayName = 'NodeIdProvider';

  var Handle = React.memo(function (_ref) {
    var onConnect = _ref.onConnect,
        rest = _objectWithoutProperties(_ref, ["onConnect"]);

    var nodeId = React.useContext(NodeIdContext);

    var _useStoreActions = useStoreActions(function (a) {
      return {
        setPosition: a.setConnectionPosition,
        setSourceId: a.setConnectionSourceId
      };
    }),
        setPosition = _useStoreActions.setPosition,
        setSourceId = _useStoreActions.setSourceId;

    var onConnectAction = useStoreState(function (s) {
      return s.onConnect;
    });

    var onConnectExtended = function onConnectExtended(params) {
      onConnectAction(params);
      onConnect(params);
    };

    return React__default.createElement(BaseHandle, _extends$1({
      nodeId: nodeId,
      setPosition: setPosition,
      setSourceId: setSourceId,
      onConnect: onConnectExtended
    }, rest));
  });
  Handle.displayName = 'Handle';
  Handle.propTypes = {
    type: PropTypes.oneOf(['source', 'target']),
    position: PropTypes.oneOf(['top', 'right', 'bottom', 'left']),
    onConnect: PropTypes.func,
    isValidConnection: PropTypes.func
  };
  Handle.defaultProps = {
    type: 'source',
    position: 'top',
    onConnect: function onConnect() {},
    isValidConnection: function isValidConnection() {
      return true;
    }
  };

  var nodeStyles = {
    background: '#ff6060',
    padding: 10,
    borderRadius: 5,
    width: 150
  };
  var DefaultNode = (function (_ref) {
    var data = _ref.data,
        style = _ref.style;
    return React__default.createElement("div", {
      style: _objectSpread2$1({}, nodeStyles, {}, style)
    }, React__default.createElement(Handle, {
      type: "target",
      position: "top"
    }), data.label, React__default.createElement(Handle, {
      type: "source",
      position: "bottom"
    }));
  });

  var nodeStyles$1 = {
    background: '#9999ff',
    padding: 10,
    borderRadius: 5,
    width: 150
  };
  var InputNode = (function (_ref) {
    var data = _ref.data,
        style = _ref.style;
    return React__default.createElement("div", {
      style: _objectSpread2$1({}, nodeStyles$1, {}, style)
    }, data.label, React__default.createElement(Handle, {
      type: "source",
      position: "bottom"
    }));
  });

  var nodeStyles$2 = {
    background: '#55dd99',
    padding: 10,
    borderRadius: 5,
    width: 150
  };
  var OutputNode = (function (_ref) {
    var data = _ref.data,
        style = _ref.style;
    return React__default.createElement("div", {
      style: _objectSpread2$1({}, nodeStyles$2, {}, style)
    }, React__default.createElement(Handle, {
      type: "target",
      position: "top"
    }), data.label);
  });

  var isHandle = function isHandle(e) {
    return e.target.className && e.target.className.includes && (e.target.className.includes('source') || e.target.className.includes('target'));
  };

  var hasResizeObserver = !!window.ResizeObserver;

  var getHandleBounds = function getHandleBounds(sel, nodeElement, parentBounds, k) {
    var handles = nodeElement.querySelectorAll(sel);

    if (!handles || !handles.length) {
      return null;
    }

    return [].map.call(handles, function (handle) {
      var bounds = handle.getBoundingClientRect();
      var dimensions = getDimensions(handle);
      var nodeIdAttr = handle.getAttribute('data-nodeid');
      var handlePosition = handle.getAttribute('data-handlepos');
      var nodeIdSplitted = nodeIdAttr.split('__');
      var handleId = null;

      if (nodeIdSplitted) {
        handleId = nodeIdSplitted.length ? nodeIdSplitted[1] : nodeIdSplitted;
      }

      return _objectSpread2$1({
        id: handleId,
        position: handlePosition,
        x: (bounds.x - parentBounds.x) * (1 / k),
        y: (bounds.y - parentBounds.y) * (1 / k)
      }, dimensions);
    });
  };

  var _onStart = function onStart(evt, _ref) {
    var setOffset = _ref.setOffset,
        onClick = _ref.onClick,
        id = _ref.id,
        type = _ref.type,
        data = _ref.data,
        position = _ref.position,
        transform = _ref.transform;

    if (inInputDOMNode(evt) || isHandle(evt)) {
      return false;
    }

    var scaledClient = {
      x: evt.clientX * (1 / [transform[2]]),
      y: evt.clientY * (1 / [transform[2]])
    };
    var offsetX = scaledClient.x - position.x - transform[0];
    var offsetY = scaledClient.y - position.y - transform[1];
    var node = {
      id: id,
      type: type,
      position: position,
      data: data
    };
    store.dispatch.setSelectedElements({
      id: id,
      type: type
    });
    setOffset({
      x: offsetX,
      y: offsetY
    });
    onClick(node);
  };

  var _onDrag = function onDrag(evt, _ref2) {
    var setDragging = _ref2.setDragging,
        id = _ref2.id,
        offset = _ref2.offset,
        transform = _ref2.transform;
    var scaledClient = {
      x: evt.clientX * (1 / transform[2]),
      y: evt.clientY * (1 / transform[2])
    };
    setDragging(true);
    store.dispatch.updateNodePos({
      id: id,
      pos: {
        x: scaledClient.x - transform[0] - offset.x,
        y: scaledClient.y - transform[1] - offset.y
      }
    });
  };

  var _onStop = function onStop(_ref3) {
    var onNodeDragStop = _ref3.onNodeDragStop,
        setDragging = _ref3.setDragging,
        isDragging = _ref3.isDragging,
        id = _ref3.id,
        type = _ref3.type,
        position = _ref3.position,
        data = _ref3.data;

    if (!isDragging) {
      return false;
    }

    setDragging(false);
    onNodeDragStop({
      id: id,
      type: type,
      position: position,
      data: data
    });
  };

  var wrapNode = (function (NodeComponent) {
    var NodeWrapper = React.memo(function (props) {
      var nodeElement = React.useRef(null);

      var _useState = React.useState({
        x: 0,
        y: 0
      }),
          _useState2 = _slicedToArray(_useState, 2),
          offset = _useState2[0],
          setOffset = _useState2[1];

      var _useState3 = React.useState(false),
          _useState4 = _slicedToArray(_useState3, 2),
          isDragging = _useState4[0],
          setDragging = _useState4[1];

      var id = props.id,
          type = props.type,
          data = props.data,
          transform = props.transform,
          xPos = props.xPos,
          yPos = props.yPos,
          selected = props.selected,
          onClick = props.onClick,
          onNodeDragStop = props.onNodeDragStop,
          style = props.style;
      var position = {
        x: xPos,
        y: yPos
      };
      var nodeClasses = classnames('react-flow__node', {
        selected: selected
      });
      var nodeStyle = {
        zIndex: selected ? 10 : 3,
        transform: "translate(".concat(xPos, "px,").concat(yPos, "px)")
      };

      var updateNode = function updateNode() {
        var storeState = store.getState();
        var bounds = nodeElement.current.getBoundingClientRect();
        var dimensions = getDimensions(nodeElement.current);
        var handleBounds = {
          source: getHandleBounds('.source', nodeElement.current, bounds, storeState.transform[2]),
          target: getHandleBounds('.target', nodeElement.current, bounds, storeState.transform[2])
        };
        store.dispatch.updateNodeData(_objectSpread2$1({
          id: id
        }, dimensions, {
          handleBounds: handleBounds
        }));
      };

      React.useEffect(function () {
        updateNode();
        var resizeObserver = null;

        if (hasResizeObserver) {
          resizeObserver = new ResizeObserver(function (entries) {
            var _iteratorNormalCompletion = true;
            var _didIteratorError = false;
            var _iteratorError = undefined;

            try {
              for (var _iterator = entries[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
                var entry = _step.value;
                updateNode();
              }
            } catch (err) {
              _didIteratorError = true;
              _iteratorError = err;
            } finally {
              try {
                if (!_iteratorNormalCompletion && _iterator["return"] != null) {
                  _iterator["return"]();
                }
              } finally {
                if (_didIteratorError) {
                  throw _iteratorError;
                }
              }
            }
          });
          resizeObserver.observe(nodeElement.current);
        }

        return function () {
          if (hasResizeObserver && resizeObserver) {
            resizeObserver.unobserve(nodeElement.current);
          }
        };
      }, []);
      return React__default.createElement(reactDraggable.DraggableCore, {
        onStart: function onStart(evt) {
          return _onStart(evt, {
            onClick: onClick,
            id: id,
            type: type,
            data: data,
            setOffset: setOffset,
            transform: transform,
            position: position
          });
        },
        onDrag: function onDrag(evt) {
          return _onDrag(evt, {
            setDragging: setDragging,
            id: id,
            offset: offset,
            transform: transform
          });
        },
        onStop: function onStop() {
          return _onStop({
            onNodeDragStop: onNodeDragStop,
            isDragging: isDragging,
            setDragging: setDragging,
            id: id,
            type: type,
            position: position,
            data: data
          });
        },
        scale: transform[2]
      }, React__default.createElement("div", {
        className: nodeClasses,
        ref: nodeElement,
        style: nodeStyle
      }, React__default.createElement(Provider, {
        value: id
      }, React__default.createElement(NodeComponent, {
        id: id,
        data: data,
        type: type,
        style: style,
        selected: selected
      }))));
    });
    NodeWrapper.displayName = 'NodeWrapper';
    NodeWrapper.whyDidYouRender = false;
    return NodeWrapper;
  });

  function createNodeTypes(nodeTypes) {
    var standardTypes = {
      input: wrapNode(nodeTypes.input || InputNode),
      "default": wrapNode(nodeTypes["default"] || DefaultNode),
      output: wrapNode(nodeTypes.output || OutputNode)
    };
    var specialTypes = Object.keys(nodeTypes).filter(function (k) {
      return !['input', 'default', 'output'].includes(k);
    }).reduce(function (res, key) {
      res[key] = wrapNode(nodeTypes[key] || DefaultNode);
      return res;
    }, {});
    return _objectSpread2$1({}, standardTypes, {}, specialTypes);
  }

  var BezierEdge = React.memo(function (_ref) {
    var sourceX = _ref.sourceX,
        sourceY = _ref.sourceY,
        targetX = _ref.targetX,
        targetY = _ref.targetY,
        sourcePosition = _ref.sourcePosition,
        targetPosition = _ref.targetPosition,
        _ref$style = _ref.style,
        style = _ref$style === void 0 ? {} : _ref$style;
    var yOffset = Math.abs(targetY - sourceY) / 2;
    var centerY = targetY < sourceY ? targetY + yOffset : targetY - yOffset;
    var dAttr = "M".concat(sourceX, ",").concat(sourceY, " C").concat(sourceX, ",").concat(centerY, " ").concat(targetX, ",").concat(centerY, " ").concat(targetX, ",").concat(targetY);

    if (['left', 'right'].includes(sourcePosition) && ['left', 'right'].includes(targetPosition)) {
      var xOffset = Math.abs(targetX - sourceX) / 2;
      var centerX = targetX < sourceX ? targetX + xOffset : targetX - xOffset;
      dAttr = "M".concat(sourceX, ",").concat(sourceY, " C").concat(centerX, ",").concat(sourceY, " ").concat(centerX, ",").concat(targetY, " ").concat(targetX, ",").concat(targetY);
    } else if (['left', 'right'].includes(sourcePosition) || ['left', 'right'].includes(targetPosition)) {
      dAttr = "M".concat(sourceX, ",").concat(sourceY, " C").concat(sourceX, ",").concat(targetY, " ").concat(sourceX, ",").concat(targetY, " ").concat(targetX, ",").concat(targetY);
    }

    return React__default.createElement("path", _extends$1({}, style, {
      d: dAttr
    }));
  });

  var StraightEdge = React.memo(function (props) {
    var sourceX = props.sourceX,
        sourceY = props.sourceY,
        targetX = props.targetX,
        targetY = props.targetY,
        _props$style = props.style,
        style = _props$style === void 0 ? {} : _props$style;
    return React__default.createElement("path", _extends$1({}, style, {
      d: "M ".concat(sourceX, ",").concat(sourceY, "L ").concat(targetX, ",").concat(targetY)
    }));
  });

  var StepEdge = React.memo(function (props) {
    var sourceX = props.sourceX,
        sourceY = props.sourceY,
        targetX = props.targetX,
        targetY = props.targetY,
        _props$style = props.style,
        style = _props$style === void 0 ? {} : _props$style;
    var yOffset = Math.abs(targetY - sourceY) / 2;
    var centerY = targetY < sourceY ? targetY + yOffset : targetY - yOffset;
    return React__default.createElement("path", _extends$1({}, style, {
      d: "M ".concat(sourceX, ",").concat(sourceY, "L ").concat(sourceX, ",").concat(centerY, "L ").concat(targetX, ",").concat(centerY, "L ").concat(targetX, ",").concat(targetY)
    }));
  });

  var wrapEdge = (function (EdgeComponent) {
    var EdgeWrapper = React.memo(function (props) {
      var id = props.id,
          source = props.source,
          target = props.target,
          type = props.type,
          animated = props.animated,
          selected = props.selected,
          onClick = props.onClick;
      var edgeClasses = classnames('react-flow__edge', {
        selected: selected,
        animated: animated
      });

      var onEdgeClick = function onEdgeClick(evt) {
        if (inInputDOMNode(evt)) {
          return false;
        }

        store.dispatch.setSelectedElements({
          id: id,
          source: source,
          target: target
        });
        onClick({
          id: id,
          source: source,
          target: target,
          type: type
        });
      };

      return React__default.createElement("g", {
        className: edgeClasses,
        onClick: onEdgeClick
      }, React__default.createElement(EdgeComponent, props));
    });
    EdgeWrapper.displayName = 'EdgeWrapper';
    EdgeWrapper.whyDidYouRender = false;
    return EdgeWrapper;
  });

  function createEdgeTypes(edgeTypes) {
    var standardTypes = {
      "default": wrapEdge(edgeTypes["default"] || BezierEdge),
      straight: wrapEdge(edgeTypes.bezier || StraightEdge)
    };
    var specialTypes = Object.keys(edgeTypes).filter(function (k) {
      return !['default', 'bezier'].includes(k);
    }).reduce(function (res, key) {
      res[key] = wrapEdge(edgeTypes[key] || BezierEdge);
      return res;
    }, {});
    return _objectSpread2$1({}, standardTypes, {}, specialTypes);
  }

  function styleInject(css, ref) {
    if ( ref === void 0 ) ref = {};
    var insertAt = ref.insertAt;

    if (!css || typeof document === 'undefined') { return; }

    var head = document.head || document.getElementsByTagName('head')[0];
    var style = document.createElement('style');
    style.type = 'text/css';

    if (insertAt === 'top') {
      if (head.firstChild) {
        head.insertBefore(style, head.firstChild);
      } else {
        head.appendChild(style);
      }
    } else {
      head.appendChild(style);
    }

    if (style.styleSheet) {
      style.styleSheet.cssText = css;
    } else {
      style.appendChild(document.createTextNode(css));
    }
  }

  var css = ".react-flow {\n  width: 100%;\n  height: 100%;\n  position: relative;\n  overflow: hidden;\n}\n\n.react-flow__renderer {\n  width: 100%;\n  height: 100%;\n  position: absolute;\n}\n\n.react-flow__zoompane {\n  width: 100%;\n  height: 100%;\n  position: absolute;\n  top: 0;\n  left: 0;\n  z-index: 1;\n}\n\n.react-flow__selectionpane {\n  width: 100%;\n  height: 100%;\n  position: absolute;\n  top: 0;\n  left: 0;\n  z-index: 2;\n}\n\n.react-flow__selection {\n  position: absolute;\n  top: 0;\n  left: 0;\n  background: rgba(0, 89, 220, 0.08);\n  border: 1px dotted rgba(0, 89, 220, 0.8);\n}\n\n.react-flow__edges {\n  position: absolute;\n  top: 0;\n  left: 0;\n  pointer-events: none;\n  z-index: 2;\n}\n\n.react-flow__edge {\n  fill: none;\n  stroke: #bbb;\n  stroke-width: 2;\n  pointer-events: all;\n}\n\n.react-flow__edge.selected {\n    stroke: #555;\n  }\n\n.react-flow__edge.animated {\n    stroke-dasharray: 5;\n    -webkit-animation: dashdraw 0.5s linear infinite;\n            animation: dashdraw 0.5s linear infinite;\n  }\n\n.react-flow__edge.connection {\n    stroke: '#ddd';\n    pointer-events: none;\n  }\n\n@-webkit-keyframes dashdraw {\n  from {stroke-dashoffset: 10}\n}\n\n@keyframes dashdraw {\n  from {stroke-dashoffset: 10}\n}\n\n.react-flow__nodes {\n  width: 100%;\n  height: 100%;\n  position: absolute;\n  z-index: 3;\n  pointer-events: none;\n  transform-origin: 0 0;\n}\n\n.react-flow__node {\n  position: absolute;\n  color: #222;\n  font-family: sans-serif;\n  font-size: 12px;\n  text-align: center;\n  cursor: -webkit-grab;\n  cursor: grab;\n  -webkit-user-select: none;\n     -moz-user-select: none;\n      -ms-user-select: none;\n          user-select: none;\n  pointer-events: all;\n  transform-origin: 0 0;\n}\n\n.react-flow__node:hover > * {\n    box-shadow: 0 1px 5px 2px rgba(0, 0, 0, 0.08);\n  }\n\n.react-flow__node.selected > * {\n    box-shadow: 0 0 0 2px #555;\n  }\n\n.react-flow__handle {\n  position: absolute;\n  width: 10px;\n  height: 8px;\n  background: rgba(255, 255, 255, 0.4);\n  cursor: crosshair;\n}\n\n.react-flow__handle.bottom {\n    top: auto;\n    left: 50%;\n    bottom: 0;\n    transform: translate(-50%, 0);\n  }\n\n.react-flow__handle.top {\n    left: 50%;\n    top: 0;\n    transform: translate(-50%, 0);\n  }\n\n.react-flow__handle.left {\n    top: 50%;\n    left: 0;\n    transform: translate(0, -50%);\n\n  }\n\n.react-flow__handle.right {\n    right: 0;\n    top: 50%;\n    transform: translate(0, -50%);\n  }\n\n.react-flow__nodesselection {\n  z-index: 3;\n  position: absolute;\n  width: 100%;\n  height: 100%;\n  top: 0;\n  left: 0;\n  transform-origin: left top;\n  pointer-events: none;\n}\n\n.react-flow__nodesselection-rect {\n    position: absolute;\n    background: rgba(0, 89, 220, 0.08);\n    border: 1px dotted rgba(0, 89, 220, 0.8);\n    pointer-events: all;\n  }\n\n.react-flow__controls-button {\n  background: #f8f8f8;\n  border: 1px solid #eee;\n  display: flex;\n  justify-content: center;\n  align-items: center;\n  width: 24px;\n  height: 24px;\n  cursor: pointer;\n}\n\n.react-flow__controls-button:hover {\n  background: #eee;\n}";
  styleInject(css);

  if (process.env.NODE_ENV !== 'production') {
    var whyDidYouRender = require('@welldone-software/why-did-you-render');

    whyDidYouRender(React__default);
  }

  var ReactFlow = function ReactFlow(_ref) {
    var style = _ref.style,
        onElementClick = _ref.onElementClick,
        elements = _ref.elements,
        children = _ref.children,
        nodeTypes = _ref.nodeTypes,
        edgeTypes = _ref.edgeTypes,
        onLoad = _ref.onLoad,
        onMove = _ref.onMove,
        onElementsRemove = _ref.onElementsRemove,
        onConnect = _ref.onConnect,
        onNodeDragStop = _ref.onNodeDragStop,
        connectionLineType = _ref.connectionLineType,
        connectionLineStyle = _ref.connectionLineStyle,
        deleteKeyCode = _ref.deleteKeyCode,
        selectionKeyCode = _ref.selectionKeyCode,
        gridColor = _ref.gridColor,
        showGrid = _ref.showGrid,
        gridGap = _ref.gridGap;
    var nodeTypesParsed = React.useMemo(function () {
      return createNodeTypes(nodeTypes);
    }, []);
    var edgeTypesParsed = React.useMemo(function () {
      return createEdgeTypes(edgeTypes);
    }, []);
    return React__default.createElement("div", {
      style: style,
      className: "react-flow"
    }, React__default.createElement(StoreProvider, {
      store: store
    }, React__default.createElement(GraphView, {
      onLoad: onLoad,
      onMove: onMove,
      onElementClick: onElementClick,
      onNodeDragStop: onNodeDragStop,
      nodeTypes: nodeTypesParsed,
      edgeTypes: edgeTypesParsed,
      connectionLineType: connectionLineType,
      connectionLineStyle: connectionLineStyle,
      selectionKeyCode: selectionKeyCode,
      onElementsRemove: onElementsRemove,
      deleteKeyCode: deleteKeyCode,
      elements: elements,
      onConnect: onConnect,
      gridColor: gridColor,
      gridGap: gridGap,
      showGrid: showGrid
    }), children));
  };

  ReactFlow.displayName = 'ReactFlow';
  ReactFlow.defaultProps = {
    onElementClick: function onElementClick() {},
    onElementsRemove: function onElementsRemove() {},
    onNodeDragStop: function onNodeDragStop() {},
    onConnect: function onConnect() {},
    onLoad: function onLoad() {},
    onMove: function onMove() {},
    nodeTypes: {
      input: InputNode,
      "default": DefaultNode,
      output: OutputNode
    },
    edgeTypes: {
      "default": BezierEdge,
      straight: StraightEdge,
      step: StepEdge
    },
    connectionLineType: 'bezier',
    connectionLineStyle: {},
    deleteKeyCode: 8,
    selectionKeyCode: 16,
    gridColor: '#999',
    gridGap: 24,
    showGrid: true
  };

  var baseStyle = {
    position: 'absolute',
    zIndex: 5,
    bottom: 10,
    right: 10,
    width: 200
  };
  var index = (function (_ref) {
    var _ref$style = _ref.style,
        style = _ref$style === void 0 ? {} : _ref$style,
        className = _ref.className,
        _ref$bgColor = _ref.bgColor,
        bgColor = _ref$bgColor === void 0 ? '#f8f8f8' : _ref$bgColor,
        _ref$nodeColor = _ref.nodeColor,
        nodeColor = _ref$nodeColor === void 0 ? '#ddd' : _ref$nodeColor;
    var canvasNode = React.useRef(null);
    var state = useStoreState(function (s) {
      return {
        width: s.width,
        height: s.height,
        nodes: s.nodes,
        transform: s.transform
      };
    });
    var mapClasses = classnames('react-flow__minimap', className);
    var nodePositions = state.nodes.map(function (n) {
      return n.__rg.position;
    });
    var width = style.width || baseStyle.width;
    var height = state.height / (state.width || 1) * width;
    var bbox = {
      x: 0,
      y: 0,
      width: state.width,
      height: state.height
    };
    var scaleFactor = width / state.width;
    var nodeColorFunc = isFunction(nodeColor) ? nodeColor : function () {
      return nodeColor;
    };
    React.useEffect(function () {
      if (canvasNode) {
        var ctx = canvasNode.current.getContext('2d');
        var nodesInside = getNodesInside(state.nodes, bbox, state.transform, true);
        ctx.fillStyle = bgColor;
        ctx.fillRect(0, 0, width, height);
        nodesInside.forEach(function (n) {
          var pos = n.__rg.position;
          var transformX = state.transform[0];
          var transformY = state.transform[1];
          var x = pos.x * state.transform[2] + transformX;
          var y = pos.y * state.transform[2] + transformY;
          ctx.fillStyle = nodeColorFunc(n);
          ctx.fillRect(x * scaleFactor, y * scaleFactor, n.__rg.width * scaleFactor * state.transform[2], n.__rg.height * scaleFactor * state.transform[2]);
        });
      }
    }, [nodePositions, state.transform, height]);
    return React__default.createElement("canvas", {
      style: _objectSpread2$1({}, baseStyle, {}, style, {
        height: height
      }),
      width: width,
      height: height,
      className: mapClasses,
      ref: canvasNode
    });
  });

  var baseStyle$1 = {
    position: 'absolute',
    zIndex: 5,
    bottom: 10,
    left: 10
  };
  var index$1 = (function (_ref) {
    var style = _ref.style,
        className = _ref.className;
    var mapClasses = classnames('react-flow__controls', className);
    return React__default.createElement("div", {
      className: mapClasses,
      style: _objectSpread2$1({}, baseStyle$1, {}, style)
    }, React__default.createElement("div", {
      className: "react-flow__controls-button react-flow__controls-zoomin",
      onClick: zoomIn
    }, "+"), React__default.createElement("div", {
      className: "react-flow__controls-button  react-flow__controls-zoomout",
      onClick: zoomOut
    }, "-"), React__default.createElement("div", {
      className: "react-flow__controls-button  react-flow__controls-fitview",
      onClick: fitView
    }, "@"));
  });

  exports.Controls = index$1;
  exports.Handle = Handle;
  exports.MiniMap = index;
  exports.default = ReactFlow;
  exports.getOutgoers = getOutgoers;
  exports.isEdge = isEdge;
  exports.isNode = isNode;
  exports.removeElements = removeElements;

  Object.defineProperty(exports, '__esModule', { value: true });

}));