refactor(elements): split into nodes and edges

src/store/configure-store.ts

@@ -1,10 +1,11 @@
-import { createStore, Store } from 'redux';
+import { createStore, applyMiddleware, Store } from 'redux';
+import thunk from 'redux-thunk';
 
 import { ReactFlowState } from '../types';
 import { ReactFlowAction } from './actions';
 import reactFlowReducer from './reducer';
 
 export default function configureStore(preloadedState: ReactFlowState): Store<ReactFlowState, ReactFlowAction> {
-  const store = createStore(reactFlowReducer, preloadedState);
+  const store = createStore(reactFlowReducer, preloadedState, applyMiddleware(thunk));
   return store;
 }