webpack.config.js

const path = require('path');
const fs = require('fs');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const DuplicatePackageCheckerPlugin = require('duplicate-package-checker-webpack-plugin');
const project = require('./aurelia_project/aurelia.json');
const { AureliaPlugin, ModuleDependenciesPlugin } = require('aurelia-webpack-plugin');
const { ProvidePlugin } = require('webpack');
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
const ServiceWorkerWebpackPlugin = require('serviceworker-webpack-plugin');

// config helpers:
const ensureArray = (config) => config && (Array.isArray(config) ? config : [config]) || [];
const when = (condition, config, negativeConfig) =>
  condition ? ensureArray(config) : ensureArray(negativeConfig);

// primary config:
const title = 'Aurelia PWA Demo';
const outDir = path.resolve(__dirname, project.platform.output);
const srcDir = path.resolve(__dirname, 'src');
const testDir = path.resolve(__dirname, 'test', 'unit');
const nodeModulesDir = path.resolve(__dirname, 'node_modules');
const baseUrl = '/';

const cssRules = [
    { loader: 'css-loader',
    options: {
      includePaths: ['./node_modules' , './src/resources/css' ]
    }
   }
];
const scssRules1 = [{
    loader: 'style-loader',
    options: {
      sassOptions: {
        includePaths: ['./node_modules' , './src/resources/css' ]
      }
  }
}, {
    loader: 'css-loader',
    options: {
      includePaths: ['./node_modules' , './src/resources/css' ]
  }
}, {
    loader: 'sass-loader',
    options: {
      sassOptions: {
        includePaths: ['./node_modules' , './src/resources/css' ]
      }
    }
}];
const scssRules2 = [{
    loader: 'css-loader'
}, {
    loader: 'sass-loader',
    options: {
      sassOptions: {
        includePaths: ['./node_modules' , './src/resources/css' ]
      }
    }
}];

module.exports = ({ production, server, extractCss, coverage, analyze, karma } = {}) => ({
  resolve: {
    extensions: ['.ts', '.js'],
    modules: [srcDir, './node_modules'],
    // Enforce single aurelia-binding, to avoid v1/v2 duplication due to
    // out-of-date dependencies on 3rd party aurelia plugins
    alias: { 'aurelia-binding': path.resolve(__dirname, 'node_modules/aurelia-binding') }
  },
  entry: {
    app: ['aurelia-bootstrapper']
  },
  mode: production ? 'production' : 'development',
  output: {
    path: outDir,
    publicPath: baseUrl,
    filename: production ? '[name].[chunkhash].bundle.js' : '[name].[hash].bundle.js',
    sourceMapFilename: production ? '[name].[chunkhash].bundle.map' : '[name].[hash].bundle.map',
    chunkFilename: production ? '[name].[chunkhash].chunk.js' : '[name].[hash].chunk.js'
  },
  optimization: {
    runtimeChunk: true,  // separates the runtime chunk, required for long term cacheability
    // moduleIds is the replacement for HashedModuleIdsPlugin and NamedModulesPlugin deprecated in https://github.com/webpack/webpack/releases/tag/v4.16.0
    // changes module id's to use hashes be based on the relative path of the module, required for long term cacheability
    moduleIds: 'hashed',
    // Use splitChunks to breakdown the App/Aurelia bundle down into smaller chunks
    // https://webpack.js.org/plugins/split-chunks-plugin/
    splitChunks: {
      hidePathInfo: true, // prevents the path from being used in the filename when using maxSize
      chunks: "initial",
      // sizes are compared against source before minification
      maxSize: 200000, // splits chunks if bigger than 200k, adjust as required (maxSize added in webpack v4.15)
      cacheGroups: {
        default: false, // Disable the built-in groups default & vendors (vendors is redefined below)
        // You can insert additional cacheGroup entries here if you want to split out specific modules
        // This is required in order to split out vendor css from the app css when using --extractCss
        // For example to separate font-awesome and bootstrap:
        // fontawesome: { // separates font-awesome css from the app css (font-awesome is only css/fonts)
        //   name: 'vendor.font-awesome',
        //   test:  /[\\/]node_modules[\\/]font-awesome[\\/]/,
        //   priority: 100,
        //   enforce: true
        // },
        // bootstrap: { // separates bootstrap js from vendors and also bootstrap css from app css
        //   name: 'vendor.font-awesome',
        //   test:  /[\\/]node_modules[\\/]bootstrap[\\/]/,
        //   priority: 90,
        //   enforce: true
        // },

        // This is the HTTP/1.1 optimised cacheGroup configuration
        vendors: { // picks up everything from node_modules as long as the sum of node modules is larger than minSize
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
          priority: 19,
          enforce: true, // causes maxInitialRequests to be ignored, minSize still respected if specified in cacheGroup
          minSize: 30000 // use the default minSize
        },
        vendorsAsync: { // vendors async chunk, remaining asynchronously used node modules as single chunk file
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors.async',
          chunks: 'async',
          priority: 9,
          reuseExistingChunk: true,
          minSize: 10000  // use smaller minSize to avoid too much potential bundle bloat due to module duplication.
        },
        commonsAsync: { // commons async chunk, remaining asynchronously used modules as single chunk file
          name: 'commons.async',
          minChunks: 2, // Minimum number of chunks that must share a module before splitting
          chunks: 'async',
          priority: 0,
          reuseExistingChunk: true,
          minSize: 10000  // use smaller minSize to avoid too much potential bundle bloat due to module duplication.
        }
      }
    }
  },
  performance: { hints: false },
  devServer: {
    contentBase: outDir,
    // serve index.html for all 404 (required for push-state)
    historyApiFallback: true
  },
  devtool: production ? 'nosources-source-map' : 'cheap-module-eval-source-map',
  module: {
    rules: [
      // CSS required in JS/TS files should use the style-loader that auto-injects it into the website
      // only when the issuer is a .js/.ts file, so the loaders are not applied inside html templates
      {
        test: /\.css$/i,
        issuer: [{ not: [{ test: /\.html$/i }] }],
        use: extractCss ? [{
                loader: MiniCssExtractPlugin.loader
            },
            'css-loader'
        ] : ['style-loader', ...cssRules]
    },
    {
        test: /\.css$/i,
        issuer: [{ test: /\.html$/i }],
        // CSS required in templates cannot be extracted safely
        // because Aurelia would try to require it again in runtime
        use: cssRules
    },
    {
        test: /\.scss$/,
        use: scssRules1, //['style-loader', 'css-loader', 'sass-loader'],
        issuer: /\.[tj]s$/i
    },
    {
        test: /\.scss$/,
        use: scssRules2, //['css-loader', 'sass-loader'],
        issuer: /\.html?$/i
    },
      
      { test: /\.html$/i, loader: 'html-loader' },
      { test: /\.ts$/, loader: "ts-loader", options: { reportFiles: [ srcDir+'/**/*.ts'] }, include: karma ? [srcDir, testDir] : srcDir },
      // embed small images and fonts as Data Urls and larger ones as files:
      { test: /\.(png|gif|jpg|cur)$/i, loader: 'url-loader', options: { limit: 8192 } },
      { test: /\.woff2(\?v=[0-9]\.[0-9]\.[0-9])?$/i, loader: 'url-loader', options: { limit: 10000, mimetype: 'application/font-woff2' } },
      { test: /\.woff(\?v=[0-9]\.[0-9]\.[0-9])?$/i, loader: 'url-loader', options: { limit: 10000, mimetype: 'application/font-woff' } },
      // load these fonts normally, as files:
      { test: /\.(ttf|eot|svg|otf)(\?v=[0-9]\.[0-9]\.[0-9])?$/i, loader: 'file-loader' },
      ...when(coverage, {
        test: /\.[jt]s$/i, loader: 'istanbul-instrumenter-loader',
        include: srcDir, exclude: [/\.(spec|test)\.[jt]s$/i],
        enforce: 'post', options: { esModules: true },
      })
    ]
  },
  plugins: [
    ...when(!karma, new DuplicatePackageCheckerPlugin()),
    new AureliaPlugin(),
    new ProvidePlugin({
      'Promise': ['promise-polyfill', 'default']
    }),
    new ModuleDependenciesPlugin({
      'aurelia-testing': ['./compile-spy', './view-spy'],
      "aurelia-i18n": [
          { name: "locales/ru/translation.json" },
          { name: "locales/en/translation.json" }
      ]
    }),
    new HtmlWebpackPlugin({
      template: 'index.ejs',
      metadata: {
        // available in index.ejs //
        title, server, baseUrl
      }
    }),
    new ServiceWorkerWebpackPlugin({
      entry: './src/sw.js',
      minimize: production,
    }),    
    // ref: https://webpack.js.org/plugins/mini-css-extract-plugin/
    ...when(extractCss, new MiniCssExtractPlugin({ // updated to match the naming conventions for the js files
      filename: production ? 'css/[name].[contenthash].bundle.css' : 'css/[name].[hash].bundle.css',
      chunkFilename: production ? 'css/[name].[contenthash].chunk.css' : 'css/[name].[hash].chunk.css'
    })),
    ...when(production || server, new CopyWebpackPlugin([
      { from: 'static', to: outDir, ignore: ['.*'] }])), // ignore dot (hidden) files
    ...when(analyze, new BundleAnalyzerPlugin())
  ]
});