webpack4最佳实践参考

webpack.config.js文件拆分

建议拆分成base（公共部分）、dev（开发环境）、prod（生产环境）三个文件，再用webpack-merge整合起来。

 

webpack.base.conf.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

const NODE_ENV = process.env.NODE_ENV || 'development';

module.exports = {
  mode: NODE_ENV,
  entry: {
    index: ['./apps/index.js'],
  },
  output: {
    path:'/',
    publicPath: '/static/performance',
    filename: `js/[name]${NODE_ENV === 'production' ? '_[contenthash:6]' : ''}.js`,
    libraryTarget: 'umd',
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader?cacheDirectory',
        options: {
          presets: [['env', { module: false }], 'stage-0', 'react'],
          plugins: [
            'transform-object-rest-spread',
            'transform-runtime',
            'transform-decorators-legacy',
            'lodash',
            ['import', { libraryName: 'antd', style: 'css' }],
          ],
          env: {
            development: {},
          },
        },
      }, {
        test: /.*\.(gif|png|jpe?g)$/i,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: 'static/imgs/[name].[ext]',
            },
          },
        ],
      }, {
        test: /\.(ttf|eot|svg|woff)(.*)?$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: 'static/fonts/[name].[ext]',
            },
          },
        ],
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.css', '.less'],
    alias: {
      '@': path.join(__dirname, './apps/'),
    },
    symlinks: false,
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './apps/index.html',
    }),
  ],
  optimization: {
    splitChunks: {
      chunks: 'initial',
      name: 'vendors',
    },
  },
};

 

webpack.dev.conf.js

const webpackMerge = require('webpack-merge');
const baseConfig = require('./webpack.base.conf');

const config = {
  watchOptions: {
    ignored: /node_modules/,
  },
  module: {
    rules: [
      {
        test: /\.less$/,
        use: [
          'style-loader',
          'css-loader?importLoaders=2',
          'postcss-loader',
          'less-loader',
        ],
      }, {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader?importLoaders=1',
          'postcss-loader',
        ],
      },
    ],
  },
  devtool: 'cheap-module-eval-source-map',
};

module.exports = webpackMerge(config, baseConfig);

 

webpack.prod.conf.js

const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const webpackMerge = require('webpack-merge');
const webpack = require('webpack');
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const baseConfig = require('./webpack.base.conf');

const config = {
  module: {
    rules: [
      {
        test: /\.less$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader?importLoaders=2',
          'postcss-loader',
          'less-loader',
        ],
      }, {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader?importLoaders=1',
          'postcss-loader',
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'css/[name]_[contenthash:6].css',
      allChunks: true,
    }),
    new webpack.HashedModuleIdsPlugin(),
  ],
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        sourceMap: true // set to true if you want JS source maps
      }),
      new OptimizeCSSAssetsPlugin({})
    ]
  },
};

module.exports = webpackMerge(config, baseConfig);