Vue CLI 中常用的加载器及其配置小结

// 内部配置示例
{
  test: /\.vue$/,
  loader: 'vue-loader',
  options: {
    compilerOptions: {
      preserveWhitespace: false
    }
  }
}

{
  test: /\.js$/,
  loader: 'babel-loader',
  exclude: file => /node_modules/.test(file) && !/\.vue\.js/.test(file)
}

// babel.config.js
module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset' // 包含 @babel/preset-env
  ],
  plugins: [
    '@babel/plugin-transform-runtime'
  ]
}

{
  test: /\.css$/,
  use: [
    'vue-style-loader', // 或 'style-loader'
    'css-loader'
  ]
}

{
  test: /\.(png|jpe?g|gif|webp)(\?.*)?$/,
  loader: 'file-loader',
  options: {
    name: 'img/[name].[hash:8].[ext]'
  }
}

{
  test: /\.(png|jpe?g|gif|webp)(\?.*)?$/,
  loader: 'url-loader',
  options: {
    limit: 4096, // 4KB 以下文件转 base64
    fallback: {
      loader: 'file-loader',
      options: { name: 'img/[name].[hash:8].[ext]' }
    }
  }
}

npm install -D sass-loader node-sass

{
  test: /\.scss$/,
  use: [
    'vue-style-loader',
    'css-loader',
    {
      loader: 'sass-loader',
      options: {
        implementation: require('sass')
      }
    }
  ]
}

npm install -D less less-loader

{
  test: /\.less$/,
  use: [
    'vue-style-loader',
    'css-loader',
    'less-loader'
  ]
}

npm install -D stylus stylus-loader

{
  test: /\.styl(us)?$/,
  use: [
    'vue-style-loader',
    'css-loader',
    'stylus-loader'
  ]
}

npm install -D svg-sprite-loader

// vue.config.js
chainWebpack: config => {
  config.module
    .rule('svg')
    .exclude.add(resolve('src/icons'))
    .end()
    
  config.module
    .rule('icons')
    .test(/\.svg$/)
    .include.add(resolve('src/icons'))
    .end()
    .use('svg-sprite-loader')
    .loader('svg-sprite-loader')
    .options({ symbolId: 'icon-[name]' })
}

npm install -D markdown-loader html-loader

{
  test: /\.md$/,
  use: [
    'html-loader',
    'markdown-loader'
  ]
}

{
  test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/i,
  loader: 'url-loader',
  options: {
    limit: 4096,
    name: 'fonts/[name].[hash:8].[ext]'
  }
}

npm install -D thread-loader

// vue.config.js
chainWebpack: config => {
  config.module
    .rule('js')
    .use('thread-loader')
    .loader('thread-loader')
    .before('babel-loader')
}

npm install -D cache-loader

chainWebpack: config => {
  config.module
    .rule('js')
    .use('cache-loader')
    .loader('cache-loader')
    .options({
      cacheDirectory: resolve('node_modules/.cache/babel-loader')
    })
    .before('babel-loader')
}

npm install -D image-webpack-loader

{
  test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
  use: [
    {
      loader: 'url-loader',
      options: { /* ... */ }
    },
    {
      loader: 'image-webpack-loader',
      options: {
        mozjpeg: { progressive: true, quality: 65 },
        optipng: { enabled: false },
        pngquant: { quality: [0.65, 0.90], speed: 4 },
        gifsicle: { interlaced: false }
      }
    }
  ]
}

// vue.config.js
module.exports = {
  chainWebpack: config => {
    // 修改现有 loader
    config.module
      .rule('vue')
      .use('vue-loader')
      .tap(options => {
        options.compilerOptions = {
          // 自定义 vue 模板编译选项
        }
        return options
      })
    
    // 添加新 loader
    config.module
      .rule('csv')
      .test(/\.csv$/)
      .use('csv-loader')
      .loader('csv-loader')
      .options({
        dynamicTyping: true,
        header: true,
        skipEmptyLines: true
      })
      .end()
  }
}

module.exports = {
  chainWebpack: config => {
    // GraphQL 加载器
    config.module
      .rule('graphql')
      .test(/\.graphql$/)
      .use('graphql-tag/loader')
      .loader('graphql-tag/loader')
      .end()
    
    // YAML 加载器
    config.module
      .rule('yaml')
      .test(/\.ya?ml$/)
      .use('yaml-loader')
      .loader('yaml-loader')
      .end()
    
    // 自定义图片处理
    config.module
      .rule('images')
      .test(/\.(png|jpe?g|gif|webp)(\?.*)?$/)
      .use('url-loader')
      .loader('url-loader')
      .options({
        limit: 8192,
        name: 'img/[name].[hash:8].[ext]'
      })
  }
}

module.exports = {
  chainWebpack: config => {
    if (process.env.NODE_ENV === 'production') {
      config.module.rule('images').use('image-webpack-loader')
    }
  }
}