啟動webpack-dev-server報錯，如圖文件結(jié)構(gòu)：├── package.json└── src    ├── index.css    ├── index.html    └── index.js    webpack.config.js配置：  let path = require('path');module.exports = {  entry: {    app: path.resolve(__dirname, 'src', 'index.js')  },  output: {    filename: '[name].js',    path: path.resolve(__dirname, 'dist')  },plugins: [    new HtmlWebpackPlugin({      template: path.resolve(__dirname, 'src', 'index.html')    })  ]};package.json的 devDependencies配置："scripts": {    "test": "echo \"Error: no test specified\" && exit 1",    "start": "webpack-dev-server"  }, "devDependencies": {    "html-webpack-plugin": "^2.30.1",    "webpack": "^3.8.1",    "webpack-dev-server": "^2.9.2"  }然后命令行執(zhí)行npm start就如圖報錯