webpack.config.js

const path = require("path");
const webpack = require("webpack");
const webpackSources = require("webpack-sources");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const HtmlWebpackInlineSourcePlugin = require("html-webpack-inline-source-plugin");

const webpackConfig = {
	entry: path.join(__dirname, "src/index.js"),
	resolve: {
		modules: [path.resolve(__dirname, "stubs"), "node_modules"],
	},
	module: {
		rules: [
			{
				test: /\.html$/,
				use: [
					{
						loader: "html-loader",
					},
				],
			},
			{
				test: /\.js$/,
				exclude: /(node_modules|bower_components)/,
				loader: "babel-loader",
				query: {
					presets: ["es2015"],
				},
			},
		],
	},
	plugins: [
		new webpack.DefinePlugin({
			"process.env.NODE_ENV": JSON.stringify(process.env.NODE_ENV || "development"),
		}),
		new webpack.optimize.UglifyJsPlugin({
			comments: false,
			sourceMap: false,
		}),
		new HtmlWebpackPlugin({
			template: path.join(__dirname, "src/index.html"),
			inlineSource: ".js$",
		}),
		new HtmlWebpackInlineSourcePlugin(),
		function RegexReplace(...args) {
			const onPath = path.join(__dirname, "stubs/on");
			this.plugin("compilation", function (compilation, params) {
				compilation.plugin("optimize-modules", function (modules) {
					modules.forEach((module) => {
						if (module.context === onPath) {
							module.source = () => new webpackSources.RawSource("module.exports = window.on");
						} else if (module.rawRequest === "underscore") {
							module.source = () => new webpackSources.RawSource("module.exports = window._");
						}
					});
				});
			});

			this.plugin("emit", function (compilation, callback) {
				const oldSource = compilation.assets["index.html"].source;

				compilation.assets["index.html"].source = function () {
					let str = oldSource().replace("text/javascript", "text/worker");
					const d = new Date();
					let n = d.toString();
					n = n.slice(0, n.indexOf("GMT") + 3);
					str = str.replace("$$CURRENTRELEASEDATE$$", n);
					return str;
				};

				callback();
			});
		},
	],
	output: {
		path: path.join(__dirname, process.env.NODE_ENV === "production" ? "prod" : "dist"),
		filename: "index.js",
	},
};

module.exports = webpackConfig;