refactor(examples): use cra + ts

example/src/CustomConnectionLine/ConnectionLine.tsx

@@ -0,0 +1,19 @@
+import React, { FC } from 'react';
+import { ConnectionLineComponentProps } from 'react-flow-renderer';
+
+const ConnectionLine: FC<ConnectionLineComponentProps> = ({ sourceX, sourceY, targetX, targetY }) => {
+  return (
+    <g>
+      <path
+        fill="none"
+        stroke="#222"
+        strokeWidth={1.5}
+        className="animated"
+        d={`M${sourceX},${sourceY} C ${sourceX} ${targetY} ${sourceX} ${targetY} ${targetX},${targetY}`}
+      />
+      <circle cx={targetX} cy={targetY} fill="#fff" r={3} stroke="#222" strokeWidth={1.5} />
+    </g>
+  );
+};
+
+export default ConnectionLine;