function sayHello(person:string) {
    return person+"吃了吗?"
}

tsc --init

npm init -y

{
  "name": "TS",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "webpack-dev-server --config ./webpack.config.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "html-webpack-plugin": "^3.2.0",
    "ts-loader": "^6.2.2",
    "typescript": "^4.3.5",
    "webpack": "^4.46.0",
    "webpack-cli": "^3.3.12",
    "webpack-dev-server": "^3.11.2"
  }
}

const path = require('path');
const HtmlWebpackPlugin = require("html-webpack-plugin")
module.exports = {
  entry: './src/index.ts',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist')
  },
  resolve: {
    // 扩展名处理
    extensions: [".js", ".ts", ".tsx"]
  },
// 开发阶段编译比较快
  devtool: "cheap-module-eval-source-map",
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
        exclude: /node_modules/ //表示node_modules中的tsx文件不做处理
      }
    ]
  },
  plugins:[
    new HtmlWebpackPlugin({
      template:"./public/index.html"
    })
  ],
  devServer: {
    //    启动gzip压缩
    compress: true,
    //    默认端口 3000
    port: 3000,
    //自动打开默认浏览器
    open: true
}
}

"scripts": {
    "dev": "webpack-dev-server --config ./webpack.config.js"
  },

npm run dev