webpack生产环境配置

拼搏现实的明天。 2022-10-12 12:17 182阅读 0赞

## webpack生产环境配置 ##

const {  resolve } = require('path');
    const MiniCssExtractPlugin = require('mini-css-extract-plugin');
    const OptimizeCssAssetsWebpackPlugin = require('optimize-css-assets-webpack-plugin');
    const HtmlWebpackPlugin = require('html-webpack-plugin');
    
    // 定义nodejs环境变量：决定使用browserslist的哪个环境
    process.env.NODE_ENV = 'production';
    
    // 复用loader
    const commonCssLoader = [
      MiniCssExtractPlugin.loader,
      'css-loader',
      { 
        // 还需要在package.json中定义browserslist
        loader: 'postcss-loader',
        options: { 
          ident: 'postcss',
          plugins: () => [require('postcss-preset-env')()]
        }
      }
    ];
    
    module.exports = { 
      entry: './src/js/index.js',
      output: { 
        filename: 'js/built.js',
        path: resolve(__dirname, 'build')
      },
      module: { 
        rules: [
          { 
            test: /\.css$/,
            use: [...commonCssLoader]
          },
          { 
            test: /\.less$/,
            use: [...commonCssLoader, 'less-loader']
          },
          /* 正常来讲，一个文件只能被一个loader处理。 当一个文件要被多个loader处理，那么一定要指定loader执行的先后顺序： 先执行eslint 在执行babel */
          { 
            // 在package.json中eslintConfig --> airbnb
            test: /\.js$/,
            exclude: /node_modules/,
            // 优先执行
            enforce: 'pre',
            loader: 'eslint-loader',
            options: { 
              fix: true
            }
          },
          { 
            test: /\.js$/,
            exclude: /node_modules/,
            loader: 'babel-loader',
            options: { 
              presets: [
                [
                  '@babel/preset-env',
                  { 
                    useBuiltIns: 'usage',
                    corejs: { version: 3},
                    targets: { 
                      chrome: '60',
                      firefox: '50'
                    }
                  }
                ]
              ]
            }
          },
          { 
            test: /\.(jpg|png|gif)/,
            loader: 'url-loader',
            options: { 
              limit: 8 * 1024,
              name: '[hash:10].[ext]',
              outputPath: 'imgs',
              esModule: false
            }
          },
          { 
            test: /\.html$/,
            loader: 'html-loader'
          },
          { 
            exclude: /\.(js|css|less|html|jpg|png|gif)/,
            loader: 'file-loader',
            options: { 
              outputPath: 'media'
            }
          }
        ]
      },
      plugins: [
        new MiniCssExtractPlugin({ 
          filename: 'css/built.css'
        }),
        new OptimizeCssAssetsWebpackPlugin(),
        new HtmlWebpackPlugin({ 
          template: './src/index.html',
          minify: { 
            collapseWhitespace: true,
            removeComments: true
          }
        })
      ],
      mode: 'production'
    };