Tree shake, sideEffects and CSS of Vue and Webpack: Load CSS files of unused components

Question

We are trying to figure out the correct way to handle CSS trees in Vue single file components when using Webpack.

In package.json, I have: "sideEffects": ["*.css", "*.less","*.vue" ], This seems to correctly prevent Vue components from loading when they shouldn't. However, every single

Answer 1

You can use MiniCssExtractPlugin to perform CSS tree shaking. If you are using scss or sass, you can add these loaders as well.

// webpack.config.js (production)
const path = require('path')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports = {
  mode: 'production',

  entry: path.resolve('src/index.js'),

  output: {
    filename: '[name].js',
    path: path.resolve('dist'),
  },

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: [
          // 将css提取到文件中
          MiniCssExtractPlugin.loader,
          // 处理你的应用程序中的`.css`文件的导入
          'css-loader',
        ],
      },
    ],
  },
  plugins: [
    // 将所有的css提取到一个单独的文件中
    new MiniCssExtractPlugin({
      filename: '[name].css',
    }),
  ],
}