Mini-css-extract-plugin doesn't bundle my css into one single file with sass

Question

When i try to add the sass-loader and run webpack there is multiple chunck .css files in the dist folder instead of just the bundled one named "style.css".

My dist output folder looks like:

0.e749007119be51de03e4.js  1.e749007119be51de03e4.js  bundle.e749007119be51de03e4.js
0.style.css                1.style.css

I guess it's because of the Mini-css-extract-plugin but i can't figure out how to fix it.

Here is my webpack file:

const webpack = require('webpack');
const { resolve } = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const ROOT = resolve(__dirname);
const SRC = resolve(ROOT, 'src');

module.exports = {
  mode: 'development',
  devtool: 'cheap-module-eval-source-map',
  entry: {
    bundle: [
      'react-hot-loader/patch',
      'webpack-hot-middleware/client?reload=true',
      resolve(SRC, 'client', 'index.js'),
    ]
  },
  output: {
    path: resolve(ROOT, 'dist', 'client'),
    filename: '[name].[hash].js',
    publicPath: '/'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.css$/,
        include: resolve(__dirname, 'node_modules', 'react-toolbox'),
        use: [
          MiniCssExtractPlugin.loader,
          // 'style-loader',
          {
            loader: 'css-loader',
            options: {
              modules: true,
              sourceMap: true,
              importLoaders: 1,
              localIdentName: '[name]_[local]_[hash:base64:5]'
            }
          },
          // 'postcss-loader'
        ]
      },
      {
        test: /\.scss$/,
        use: ['style-loader', MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader']
      },
      {
        test: /\.css$/,
        exclude: resolve(__dirname, 'node_modules', 'react-toolbox'),
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.(jpe?g|svg|png|gif)$/,
        use: ['file-loader']
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        use: ['file-loader']
      }
    ]
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new MiniCssExtractPlugin({
      filename: 'style.css',
    }),
  ]
};

Any idea ?

Answer 1

There is two problems coming with this way. If i wanna use a plugin like html-webpack-plugin the index.html file is not filled with the anymore. Secondly the normal behavior of MiniCssExtractPlugin shouldn't be to create a file style.css like i precised in the constructor ?

No, since you have async chunks, it is going to create a style.css for each style that is removed from those async chunks.

I assure you that if you are using html-webpack-plugin it is going to work. It is just not added there because those css had not came from one of the entry points. THat is why it is not inserted directly into the html. I have a similar project and it works perfectly.

If those are not emmited from the entry point, there are going to be loaded dynamically by webpack once those chunks are requested.

Big files harms users. Code splitting is always the answer for everything!!