让VS2017理解jsx

npm install react react-dom
npm install @types/react @types/react-dom

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: __dirname + '/dist'
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-react']
          }
        }
      }
    ]
  }
};

{
  "presets": ["@babel/preset-env"]
}

import React from 'react';

const App = () => {
  return <h1>Hello, World!</h1>;
};

export default App;

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(<App />, document.getElementById('root'));

npm start