webpack.common.js

const webpack = require('webpack');
const path = require('path');

const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = (env = {}) => ({
  entry: {
    app: './src/index.js',
  },
  output: {
    filename: '[name].[hash].bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },
  stats: 'verbose',
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader'],
      },
      {
        test: /\.(png|svg|jpg|gif|jpeg|ico)$/,
        exclude: /node_modules/,
        use: ['file-loader'],
      },
      {
        test: /\.(sa|sc|c)ss$/,
        exclude: /node_modules/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'postcss-loader',
          'sass-loader',
        ],
      },
    ],
  },
  resolve: {
    modules: [
      path.resolve(__dirname, 'src'),
      'node_modules',
      path.resolve(__dirname, 'assets'),
    ],
  },
  plugins: [
    new webpack.DefinePlugin(
      Object.keys(env).reduce((acc, key) => {
        acc[`process.env.${key}`] = JSON.stringify(env[key]);
        return acc;
      }, {})
    ),
    new CleanWebpackPlugin({
      cleanAfterEveryBuildPatterns: ['dist', '!**/.gitkeep'],
    }),
    new MiniCssExtractPlugin({
      filename: '[name].[hash].css',
      chunkFilename: '[id].[hash].css',
    }),
    new HtmlWebpackPlugin({
      title: 'My Course Schedule',
      filename: 'index.html',
      hash: true,
      template: 'template.html',
      favicon: 'assets/favicon.ico',
    }),
  ],
});