Webpack4(八) 使用WebpackDevServer提升效率

WebpackDevServer

它的作用就是帮助你刷新页面 这样你不用每次更改在手动刷新页面

(1) 安装 WebpackDevServer

cnpm i webpack-dev-server -D

(2)修改 webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin')
const CleanWebpackPlugin = require('clean-webpack-plugin')

var path = require('path')

module.exports = {
  mode: 'development',
  devtool: 'cheap-module-eval-source-map', //开发阶段
  //devtool:"cheap-module-source-map", //线上环境开发
  entry: {
    main: './src/index.js', //入口文件路径
  },
  devServer: {
    contentBase: './dist',
    open: true,
  },
  module: {
    rules: [
      {
        test: /\.(jpg|png|gif)$/,
        use: {
          loader: 'url-loader',
          options: {
            name: '[name]_[hash].[ext]',
            outputPath: 'images/',
            limit: 2048,
          },
        },
      },
      {
        test: /\.(eot|ttf|svg))$/, //加载字体文件验证
        use: {
          loader: 'file-loader',
        },
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },

      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader', 'postcss-loader'],
      },
    ],
  },
  //加入插件
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.html',
    }),
    new CleanWebpackPlugin(['dist']), //删除这个目录下面的文件
  ],
  output: {
    filename: 'bundle.js', //输出得名字
    path: path.resolve(__dirname, 'dist'), //输出得路径 __dirname就是当前目录
  },
}

(3)修改 package.json 里面添加

{
  "scripts":{
       "start":"webpack-dev-server"
  }
}

(4) 有的时候我们还需要代理设置可以这样，还可以加端口号

const HtmlWebpackPlugin = require('html-webpack-plugin')
const CleanWebpackPlugin = require('clean-webpack-plugin')

var path = require('path')

module.exports = {
  mode: 'development',
  devtool: 'cheap-module-eval-source-map', //开发阶段
  //devtool:"cheap-module-source-map", //线上环境开发
  entry: {
    main: './src/index.js', //入口文件路径
  },
  devServer: {
    contentBase: './dist',
    open: true,
    proxy: {
      '/api': 'http://localhost:3000', //凡是访问/api都会代理到localhost:3000
    },
    port: 8080,
  },
  module: {
    rules: [
      {
        test: /\.(jpg|png|gif)$/,
        use: {
          loader: 'url-loader',
          options: {
            name: '[name]_[hash].[ext]',
            outputPath: 'images/',
            limit: 2048,
          },
        },
      },
      {
        test: /\.(eot|ttf|svg))$/, //加载字体文件验证
        use: {
          loader: 'file-loader',
        },
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },

      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader', 'postcss-loader'],
      },
    ],
  },
  //加入插件
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.html',
    }),
    new CleanWebpackPlugin(['dist']), //删除这个目录下面的文件
  ],
  output: {
    filename: 'bundle.js', //输出得名字
    path: path.resolve(__dirname, 'dist'), //输出得路径 __dirname就是当前目录
  },
}