五、配置webpack-dev-server

1-1 安装

yarn add webpack-dev-server

module.exports = {
   devServer: {
        static: {
            directory: path.join(__dirname, 'public'),
        },
        compress: true,
        port: 8080,
        client:{
            overlay:{
                errors:true,
                warnings: true
            }
        }
    }
}

//配置package.json
"scripts": {
    ...
    "serve": "webpack serve --open"
  }

yarn serve
npm run serve