Question: Multiple JS chunks, single CSS chunk

[AvraamMavridis]

Is it possible to have multiple JS chunks but a single css output file?

My current setup is:

  optimization: {
    minimize: true,
    minimizer: [
      new UglifyJSPlugin({
        uglifyOptions: {
          compress: {
            passes: 2,
          },
          output: {
            comments: false,
          },
        },
      }),
    ],
    splitChunks: {
      chunks: 'all',
      cacheGroups: {
        vendor: {
          filename: 'vendorbundle.js',
          test: m => /node_modules/.test(m.context),
        },
      },
    },
  },

...
...

    new MiniCssExtractPlugin({
      filename: 'styles.css',
    }),

This generates 2 JS files, and 2 css files (styles.css, and 1.styles.css)

What I would like to have is a single css file, is that doable?

[Pierre-Do]

I've been using something like that for the same use-case with success:

  optimization: {
    splitChunks: {
      cacheGroups: {
        default: false,
        // Custom common chunk
        bundle: {
          name: 'commons',
          chunks: 'all',
          minChunks: 3,
          reuseExistingChunk: false,
        },
        // Customer vendor
        vendors: {
          chunks: 'initial',
          name: 'vendors',
          test: 'vendors',
        },
        // Merge all the CSS into one file
        styles: {
          name: 'styles',
          test: /\.s?css$/,
          chunks: 'all',
          minChunks: 1,
          reuseExistingChunk: true,
          enforce: true,
        },
      },
    },
  },

[AvraamMavridis]

Doesnt seem to work for me

[AvraamMavridis]

@Akkenar can you share all of the config file please?

[Pierre-Do]

@AvraamMavridis it seems that I was missing an enforce: true on the rule.

You'll find an example project there: https://github.com/Akkenar/CSS-Single-File-Example

Webpack config:

import webpack from 'webpack';
import path from 'path';
import MiniCssExtractPlugin from 'mini-css-extract-plugin';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import OptimizeCSSAssetsPlugin from 'optimize-css-assets-webpack-plugin';

const vendors = ['react', 'react-dom'];
const isProduction = process.env.NODE_ENV === 'production';

export default {
  name: 'client',
  mode: isProduction ? 'production' : 'development',
  target: 'web',
  entry: {
    bundle: './entry.js',
    vendors,
  },
  context: path.join(__dirname, 'src'),

  stats: {
    // Disable the verbose output on build
    children: false,
  },

  devtool: isProduction ? false : 'inline-cheap-module-eval-source-map',

  output: {
    path: path.join(__dirname, 'target', 'build'),
    filename: '[name].js',
    chunkFilename: '[name].js',
  },

  resolve: {
    extensions: ['.js', '.jsx', '.scss'],
  },

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: ['babel-loader?cacheDirectory'],
      },
      {
        test: /\.scss$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader'],
      },
    ],
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        default: false,
        // Custom common chunk
        bundle: {
          name: 'commons',
          chunks: 'all',
          minChunks: 3,
          reuseExistingChunk: false,
        },
        // Customer vendor
        vendors: {
          chunks: 'initial',
          name: 'vendors',
          test: 'vendors',
        },
        // Merge all the CSS into one file
        styles: {
          name: 'styles',
          test: /\.s?css$/,
          chunks: 'all',
          enforce: true,
        },
      },
    },
  },
  profile: false,

  plugins: [
    new webpack.optimize.ModuleConcatenationPlugin(),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[name].css',
    }),
    new OptimizeCSSAssetsPlugin(),
    new HtmlWebpackPlugin({
      minify: {
        collapseWhitespace: true,
        preserveLineBreaks: true,
        removeComments: true,
      },
      filename: 'index.html',
      template: path.join(__dirname, 'src', 'index.html'),
    }),
  ],
};

[AvraamMavridis]

@Akkenar It doesnt really work:

That is my setup:

const path = require('path');
const loaders = require('./loaders');
const plugins = require('./plugins');
const webpack = require('webpack');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const ProgressBarPlugin = require('progress-bar-webpack-plugin');
const frontend = require('../package.json');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const DIRECTORY = `${__dirname}/../`;

module.exports = {
  mode: 'production',
  devtool: 'source-map',
  entry: {
    app: ['babel-polyfill', path.join(__dirname, './../src/App.js')],
  },
  optimization: {
    minimize: true,
    minimizer: [
      new UglifyJSPlugin({
        uglifyOptions: {
          compress: {
            passes: 2,
          },
          output: {
            comments: false,
          },
        },
      }),
    ],
    splitChunks: {
      chunks: 'all',
      cacheGroups: {
        default: false,
        // Custom common chunk
        bundle: {
          name: 'commons',
          chunks: 'all',
          minChunks: 3,
          reuseExistingChunk: false,
        },
        // Customer vendor
        vendor: {
          filename: 'vendorbundle.js',
          test: m => /node_modules/.test(m.context),
        },
        // Merge all the CSS into one file
        styles: {
          name: 'styles',
          test: /\.s?css$/,
          chunks: 'all',
          minChunks: 1,
          reuseExistingChunk: true,
          enforce: true,
        },
      },
    },
  },
  output: {
    filename: 'bundle.js',
    path: path.join(DIRECTORY, './artifacts/'),
    chunkFilename: 'chunk-[name]-[hash].js',
    publicPath: '/savingglobal/assets/dist/js/',
  },
  plugins: plugins.concat([
    new ProgressBarPlugin(),

    /* Css specific plugins */
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[name].css',
    }),
    new OptimizeCssAssetsPlugin({
      cssProcessor: require('cssnano'),
      cssProcessorOptions: {
        discardComments: { removeAll: true },
        zindex: false,
      },
      canPrint: true,
    }),
    /* Define the enviroment */
    new webpack.DefinePlugin({
      PRODUCTION: JSON.stringify(true),
      'process.env.NODE_ENV': JSON.stringify('production'),
      'process.env': {
        NODE_ENV: JSON.stringify('production'),
        frontend_version: JSON.stringify(frontend.version),
      },
    }),
    new webpack.optimize.ModuleConcatenationPlugin(),
  ]),
  module: {
    rules: loaders.concat([
      {
        test: /\.scss$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader'],
      },
    ]),
  },
  resolve: {
    alias: {
      'raisin-frontend': path.resolve(__dirname, '../../'),
      'ui-lib': '@raisin/ui-lib',
      assets: path.resolve(__dirname, '../assets'),
    },
    extensions: ['.js', '.jsx', '.json', '.scss'],
  },
};

[Pierre-Do]

It seems that the vendors are still generated for the CSS.

You could try:

• Add vendors: false, in cacheGroups, see if this disables the vendor~ generation
• Try to add priorities to the rules within cacheGroups, see if you can have the style one being more greedy.

[sokra]

Do you want to send a PR adding this to the documentation?

minChunks: 1, and reuseExistingChunk: true, are not needed.

[Pierre-Do]

Thanks for your feedback @sokra .

I'll send a PR whenever I find time.

[dtothefp]

duplicate here #41

[Cople]

how to prevent styles.js? it's a redundant file.

[sokra]

how to prevent styles.js? it's a redundant file.

This need to be solved on webpack side

[aboeglin]

Is this supposed to work at the moment ?