chore(examples): add old api examples

example/src_oldapi/UseUpdateNodeInternals/CustomNode.tsx

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+import React, { memo, FC, useMemo, CSSProperties } from 'react';
+
+import { Handle, Position, NodeProps } from 'react-flow-renderer';
+
+const nodeStyles: CSSProperties = { padding: 10, border: '1px solid #ddd' };
+
+const CustomNode: FC<NodeProps> = ({ data }) => {
+  const handles = useMemo(
+    () =>
+      Array.from({ length: data.handleCount }, (x, i) => {
+        const handleId = `handle-${i}`;
+        return (
+          <Handle
+            key={handleId}
+            type="source"
+            position={Position.Right}
+            id={handleId}
+            style={{ top: 10 * i + data.handlePosition * 10 }}
+          />
+        );
+      }),
+    [data.handleCount, data.handlePosition]
+  );
+
+  return (
+    <div style={nodeStyles}>
+      <Handle type="target" position={Position.Left} />
+      <div>output handle count: {data.handleCount}</div>
+      {handles}
+    </div>
+  );
+};
+
+export default memo(CustomNode);

example/src_oldapi/UseUpdateNodeInternals/index.tsx

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+import React, { useState, useCallback, CSSProperties } from 'react';
+
+import ReactFlow, {
+  NodeTypesType,
+  addEdge,
+  useZoomPanHelper,
+  ReactFlowProvider,
+  Elements,
+  Connection,
+  Edge,
+  ElementId,
+  useUpdateNodeInternals,
+  Position,
+  isEdge,
+} from 'react-flow-renderer';
+import CustomNode from './CustomNode';
+
+const initialHandleCount = 1;
+
+const initialElements: Elements = [
+  {
+    id: '1',
+    type: 'custom',
+    data: { label: 'Node 1', handleCount: initialHandleCount, handlePosition: 0 },
+    position: { x: 250, y: 5 },
+  },
+];
+
+const buttonWrapperStyles: CSSProperties = { position: 'absolute', right: 10, top: 10, zIndex: 10 };
+
+const nodeTypes: NodeTypesType = {
+  custom: CustomNode,
+};
+
+let id = 5;
+const getId = (): ElementId => `${id++}`;
+
+const UpdateNodeInternalsFlow = () => {
+  const [elements, setElements] = useState<Elements>(initialElements);
+  const updateNodeInternals = useUpdateNodeInternals();
+  const onConnect = (params: Connection | Edge) => setElements((els) => addEdge(params, els));
+  const { project } = useZoomPanHelper();
+
+  const onPaneClick = useCallback(
+    (evt) =>
+      setElements((els) =>
+        els.concat({
+          id: getId(),
+          position: project({ x: evt.clientX, y: evt.clientY - 40 }),
+          data: { label: 'new node' },
+          targetPosition: Position.Left,
+          sourcePosition: Position.Right,
+        })
+      ),
+    [project]
+  );
+
+  const toggleHandleCount = useCallback(() => {
+    setElements((els) =>
+      els.map((el) => {
+        if (isEdge(el)) {
+          return el;
+        }
+
+        return { ...el, data: { ...el.data, handleCount: el.data?.handleCount === 1 ? 2 : 1 } };
+      })
+    );
+  }, []);
+
+  const toggleHandlePosition = useCallback(() => {
+    setElements((els) =>
+      els.map((el) => {
+        if (isEdge(el)) {
+          return el;
+        }
+
+        return { ...el, data: { ...el.data, handlePosition: el.data?.handlePosition === 0 ? 1 : 0 } };
+      })
+    );
+  }, []);
+
+  const updateNode = useCallback(() => updateNodeInternals('1'), [updateNodeInternals]);
+
+  return (
+    <ReactFlow elements={elements} nodeTypes={nodeTypes} onConnect={onConnect} onPaneClick={onPaneClick}>
+      <div style={buttonWrapperStyles}>
+        <button onClick={toggleHandleCount}>toggle handle count</button>
+        <button onClick={toggleHandlePosition}>toggle handle position</button>
+        <button onClick={updateNode}>update node internals</button>
+      </div>
+    </ReactFlow>
+  );
+};
+
+const WrappedFlow = () => (
+  <ReactFlowProvider>
+    <UpdateNodeInternalsFlow />
+  </ReactFlowProvider>
+);
+
+export default WrappedFlow;