Tone.js/webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");

///////////////////////////////////////
// Defaults
///////////////////////////////////////

const defaults = {
	mode : "development",
	context : __dirname,
	entry : {
		Tone : "./Tone/index.ts",
	},
	output : {
		path : path.resolve(__dirname, "build"),
		filename : "[name].js",
		library: "Tone",
		libraryTarget : "umd"
	},
	resolve : {
		extensions: ['.ts', '.js']
	},
	module : {
		rules : [
			{
				test: /\.ts$/,
				use: 'ts-loader',
				exclude: /(node_modules)/,
			}
		]
	},
	devtool : "cheap-source-map",
};

///////////////////////////////////////
// Scratch
///////////////////////////////////////

const scratch = Object.assign({}, defaults, {
	entry : {
		scratch : "./examples/scratch.ts",
	},
	plugins : [
		new HtmlWebpackPlugin({
			template : "./examples/scratch.html"
		})
	],
});

///////////////////////////////////////
// Tests
///////////////////////////////////////

const test = Object.assign({}, defaults, {
	entry : {
		test : "./test/test.js",
	},
	plugins : [
		new HtmlWebpackPlugin({
			filename : "test.html",
			template : "./test/index.html",
		})
	],
});

///////////////////////////////////////
// Production
///////////////////////////////////////

const production = Object.assign({}, defaults, {
	mode : "production",
	devtool : "source-map",
});

module.exports = env => {
	if (env.test){
		return test;
	} else if (env.production){
		return production;
	} else {
		return scratch;		
	}
};