webpack压缩css和js

压缩 CSS

webpack5 貌似会内置 css 的压缩，webpack4 可以自己设置一个插件即可。

压缩 css 插件：optimize-css-assets-webpack-plugin

安装

npm i -D optimize-css-assets-webpack-plugin

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
//一、导入安装插件包
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const autoprefixer = require('autoprefixer');

module.exports = {
  mode: 'production',
  entry: './src/index.js',
  output: {
    filename: 'main.[hash].js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader'
          },
          {
            loader: 'postcss-loader',
            options: {
              ident: 'postcss',
              plugins: loader => [autoprefixer({ browsers: ['> 0.15% in CN'] })]
            }
          },
          {
            loader: 'sass-loader'
          }
        ]
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name][hash].css',
      chunkFilename: '[id][hash].css'
    })
  ],
//二、增加下列优化（增加css）
  optimization: {
    minimizer: [new OptimizeCSSAssetsPlugin({})]
  }
};

JS 压缩

压缩需要一个插件： uglifyjs-webpack-plugin, 此插件需要一个前提就是：mode: 'production'.

安装

npm i -D uglifyjs-webpack-plugin

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
//一、导入压缩插件包
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const autoprefixer = require('autoprefixer');

module.exports = {
  mode: 'production',
  entry: './src/index.js',
  output: {
    filename: 'main.[hash].js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader'
          },
          {
            loader: 'postcss-loader',
            options: {
              ident: 'postcss',
              plugins: loader => [autoprefixer({ browsers: ['> 0.15% in CN'] })]
            }
          },
          {
            loader: 'sass-loader'
          }
        ]
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name][hash].css',
      chunkFilename: '[id][hash].css'
    })
  ],
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        sourceMap: true // set to true if you want JS source maps
      }),
      new OptimizeCSSAssetsPlugin({})
    ]
  }
};