webpack.config.babel.js

import webpack from 'webpack';
import ExtractTextPlugin from 'extract-text-webpack-plugin';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import autoprefixer from 'autoprefixer';
import CopyWebpackPlugin from 'copy-webpack-plugin';
import OfflinePlugin from 'offline-plugin';
import path from 'path';
const ENV = process.env.NODE_ENV || 'development';

const CSS_MAPS = ENV!=='production';

let PUBLIC_ROOT;
if (ENV === 'production') {
	PUBLIC_ROOT = '/easysampler/';
}
else {
	PUBLIC_ROOT = '/';
}

module.exports = {
	context: path.resolve(__dirname, 'src'),
	entry: './index.js',

	output: {
		path: path.resolve(__dirname, 'build'),
		publicPath: PUBLIC_ROOT,
		filename: 'bundle.js'
	},

	resolve: {
		extensions: ['.jsx', '.js', '.json', '.css'],
		modules: [
			path.resolve(__dirname, 'src/lib'),
			path.resolve(__dirname, 'node_modules'),
			'node_modules'
		],
		alias: {
			components: path.resolve(__dirname, 'src/components'),    // used for tests
			style: path.resolve(__dirname, 'src/style'),
			react: 'preact-compat',
			'react-dom': 'preact-compat'
		}
	},

	module: {
		rules: [
			{
				test: /\.js?$/,
				loader: 'string-replace-loader',
				query: {
					search: '###BASENAME###',
					replace: PUBLIC_ROOT
				}
			},
			{
				test: /\.jsx?$/,
				exclude: path.resolve(__dirname, 'src'),
				enforce: 'pre',
				use: 'source-map-loader'
			},
			{
				test: /\.jsx?$/,
				exclude: /node_modules/,
				use: 'babel-loader'
			},
			{
				test: /\.(css)$/,
				include: [path.resolve(__dirname, 'src/components')],
				use: ExtractTextPlugin.extract({
					fallback: 'style-loader',
					use: [
						{
							loader: 'css-loader',
							options: { modules: true, sourceMap: CSS_MAPS, importLoaders: 1, minimize: true }
						},
						{
							loader: `postcss-loader`,
							options: {
								sourceMap: CSS_MAPS,
								plugins: () => {
									autoprefixer({ browsers: [ 'last 2 versions' ] });
								}
							}
						}
					]
				})
			},
			{
				test: /\.(css)$/,
				exclude: [path.resolve(__dirname, 'src/components')],
				use: ExtractTextPlugin.extract({
					fallback: 'style-loader',
					use: [
						{
							loader: 'css-loader',
							options: { sourceMap: CSS_MAPS, importLoaders: 1, minimize: true }
						},
						{
							loader: `postcss-loader`,
							options: {
								sourceMap: CSS_MAPS,
								plugins: () => {
									autoprefixer({ browsers: [ 'last 2 versions' ] });
								}
							}
						}
					]
				})
			},
			{
				test: /\.json$/,
				use: 'json-loader'
			},
			{
				test: /\.(xml|html|txt|md)$/,
				use: 'raw-loader'
			},
			{
				test: /\.(svg|woff2?|ttf|eot|jpe?g|png|gif)(\?.*)?$/i,
				use: ENV==='production' ? 'file-loader' : 'url-loader'
			}
		]
	},
	plugins: ([
		new webpack.NoEmitOnErrorsPlugin(),
		new ExtractTextPlugin({
			filename: 'style.css',
			allChunks: true,
			disable: ENV !== 'production'
		}),
		new webpack.DefinePlugin({
			'process.env.NODE_ENV': JSON.stringify(ENV)
		}),
		new HtmlWebpackPlugin({
			template: './index.ejs',
			minify: { collapseWhitespace: true }
		}),
		new CopyWebpackPlugin([
			{ from: './manifest.json', to: './' },
			{ from: './assets/favicon.ico', to: './' }
		])
	]).concat(ENV==='production' ? [
		new webpack.optimize.UglifyJsPlugin({
			output: {
				comments: false
			},
			compress: {
				unsafe_comps: true,
				properties: true,
				keep_fargs: false,
				pure_getters: true,
				collapse_vars: true,
				unsafe: true,
				warnings: false,
				screw_ie8: true,
				sequences: true,
				dead_code: true,
				drop_debugger: true,
				comparisons: true,
				conditionals: true,
				evaluate: true,
				booleans: true,
				loops: true,
				unused: true,
				hoist_funs: true,
				if_return: true,
				join_vars: true,
				cascade: true,
				drop_console: true
			}
		}),

		new OfflinePlugin({
			relativePaths: false,
			AppCache: false,
			excludes: ['_redirects'],
			ServiceWorker: {
				events: true
			},
			cacheMaps: [
				{
					match: /.*/,
					to: '/',
					requestTypes: ['navigate']
				}
			],
			publicPath: PUBLIC_ROOT
		})
	] : []),

	stats: { colors: true },

	node: {
		global: true,
		process: false,
		Buffer: false,
		__filename: false,
		__dirname: false,
		setImmediate: false
	},

	devtool: ENV==='production' ? 'source-map' : 'cheap-module-eval-source-map',

	devServer: {
		port: process.env.PORT || 8080,
		host: 'localhost',
		publicPath: '/',
		contentBase: './src',
		historyApiFallback: true,
		open: true,
		openPage: '',
		proxy: {
			// OPTIONAL: proxy configuration:
			// '/optional-prefix/**': { // path pattern to rewrite
			//   target: 'http://target-host.com',
			//   pathRewrite: path => path.replace(/^\/[^\/]+\//, '')   // strip first path segment
			// }
		}
	}
};