const webpack = require('webpack') const config = require('sapper/webpack/config.js') const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin const LodashModuleReplacementPlugin = require('lodash-webpack-plugin') const TerserWebpackPlugin = require('terser-webpack-plugin') const MiniCssExtractPlugin = require('mini-css-extract-plugin') const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin') const isDev = config.dev module.exports = { entry: config.client.entry(), output: Object.assign(config.client.output(), { globalObject: 'this' }), // enables HMR in workers resolve: { extensions: ['.js', '.json', '.html'] }, mode: isDev ? 'development' : 'production', module: { rules: [ { test: /\.html$/, exclude: /node_modules/, use: { loader: 'svelte-loader', options: { dev: isDev, hydratable: true, emitCss: !isDev, cascade: false, store: true, hotReload: isDev } } }, isDev && { test: /\.css$/, use: [ 'style-loader', 'css-loader' ] }, !isDev && { test: /\.css$/, use: [ MiniCssExtractPlugin.loader, 'css-loader' ] } ].filter(Boolean) }, node: { setImmediate: false }, optimization: isDev ? {} : { minimizer: [ new TerserWebpackPlugin({ cache: true, parallel: true, sourceMap: true, terserOptions: { ecma: 6, mangle: true, compress: { pure_funcs: ['console.log'] }, output: { comments: false }, safari10: true } }), new OptimizeCSSAssetsPlugin({}) ], splitChunks: { chunks: 'async', minSize: 5000, maxAsyncRequests: Infinity, maxInitialRequests: Infinity } }, plugins: [ new LodashModuleReplacementPlugin({ paths: true }) ].concat(isDev ? [ new webpack.HotModuleReplacementPlugin({ requestTimeout: 120000 }) ] : [ new MiniCssExtractPlugin({ filename: '[name].[hash].css', chunkFilename: '[name].[id].[hash].css' }), new webpack.DefinePlugin({ 'process.browser': true, 'process.env.NODE_ENV': '"production"' }), new BundleAnalyzerPlugin({ // generates report.html and stats.json analyzerMode: 'static', generateStatsFile: true, statsOptions: { // allows usage with http://chrisbateman.github.io/webpack-visualizer/ chunkModules: true }, openAnalyzer: false, logLevel: 'silent' // do not bother Webpacker, who runs with --json and parses stdout }) ]), devtool: isDev ? 'cheap-module-source-map' : 'source-map' }