webpack.common.js

const fs = require('fs');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const ScriptExtHtmlWebpackPlugin = require('script-ext-html-webpack-plugin');
const { GenerateSW, InjectManifest } = require('workbox-webpack-plugin');
const PwaManifestWebpackPlugin = require('pwa-manifest-webpack-plugin');
const autoprefixer = require('autoprefixer');
const path = require('path');

// installed node modules that must be transpiled through babel
const includedNodeModules = [
  'MODULE_THAT_MUST_BE_INCLUDED',
  'ANOTHER_MODULE_THAT_MUST_BE_INCLUDED'
];

// Environment constants
const IS_DEV = process.argv.includes('development');
const IS_PROD = !IS_DEV;

const sassPath = './src/sass/main.sass';
const scssPath = sassPath.replace(/\.sass$/g, '.scss');

const htmlLoaderConfig = {
  loader: 'html-loader',
  options: {
    attrs: [
      ':src',
      ':data-src',
      ':srcset',
      ':data-srcset',
    ],
    interpolate: true,
  },
};

module.exports = {
  entry: {
    main: [
      fs.existsSync(sassPath) ? sassPath : scssPath,
      'regenerator-runtime/runtime',
      './src/js/main.js',
    ],
  },

  module: {
    rules: [{
      test: /\.html$/i,
      use: htmlLoaderConfig,
    }, {
      test: /\.pug$/i,
      use: [htmlLoaderConfig, {
        loader: 'pug-plain-loader',
      }]
    }, {
      test: /\.ejs$/i,
      use: [htmlLoaderConfig, {
        loader: 'ejs-plain-loader',
      }],
    }, {
      // transpile es6 to es5
      test: /\.js$/i,
      exclude: new RegExp(`node_modules/(?!(${includedNodeModules.join('|')})/).*`),
      use: [{
        loader: 'babel-loader',
        options: {
          presets: [
            ['@babel/preset-env', { modules: false /* allow tree shaking */ }],
          ],
          plugins: [
            '@babel/plugin-syntax-dynamic-import',
            ['@babel/plugin-proposal-class-properties', { loose: true }],
          ],
        },
      }, {
        loader: 'eslint-loader',
      }],
    }, {
      // transpile sass and autoprefix it
      test: /\.(sass|scss|css)$/i,
      use: [{
        loader: IS_PROD ? MiniCssExtractPlugin.loader : 'style-loader',
      }, {
        loader: 'css-loader',
      }, {
        loader: 'postcss-loader',
        options: {
          plugins: [
            autoprefixer({ browsers: ['last 2 versions', '> 1%'] }),
          ],
        },
      }, {
        loader: 'sass-loader',
        options: {
          includePaths: ['./node_modules'],
        },
      }],
    }, {
      // load images
      test: /\.(png|jpe?g|svg|gif|webp)$/i,
      use: [{
        loader: 'url-loader',
        options: { limit: 8192 },
      }],
    }],
  },

  plugins: [
    new HtmlWebpackPlugin({
      template: './src/views/index.ejs',
      chunks: ['main'],
    }),

    new ScriptExtHtmlWebpackPlugin({
      defaultAttribute: 'async',
    }),

    new InjectManifest({
      swSrc: './src/js/serviceWorker.js',
    }),

    new PwaManifestWebpackPlugin({
      short_name: "Webpack Starter",
      name: "Webpack Starter",
      icon: {
        src: path.resolve('src/icons/launcher-icon.png'),
        sizes: [512, 256, 192, 152, 144, 128],
      },
      start_url: "/index.html",
      display: "standalone",
      theme_color: "#ffedcd",
      background_color: "#ffedcd",
    }),
  ],
};