refactor(examples): use cra + ts

example/src/UpdateNode/index.tsx

@@ -1,19 +1,19 @@
 import React, { useEffect, useState } from 'react';
-import ReactFlow from 'react-flow-renderer';
+import ReactFlow, { Elements } from 'react-flow-renderer';
 
 import './updatenode.css';
 
-const initialElements = [
+const initialElements: Elements = [
   { id: '1', data: { label: '-' }, position: { x: 100, y: 100 } },
   { id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 200 } },
   { id: 'e1-2', source: '1', target: '2' },
 ];
 
 const UpdateNode = () => {
-  const [elements, setElements] = useState(initialElements);
-  const [nodeName, setNodeName] = useState('Node 1');
-  const [nodeBg, setNodeBg] = useState('#eee');
-  const [nodeHidden, setNodeHidden] = useState(false);
+  const [elements, setElements] = useState<Elements>(initialElements);
+  const [nodeName, setNodeName] = useState<string>('Node 1');
+  const [nodeBg, setNodeBg] = useState<string>('#eee');
+  const [nodeHidden, setNodeHidden] = useState<boolean>(false);
 
   useEffect(() => {
     setElements((els) =>