How do I minify the worker chunk?

[nkovacs]

It seems I have to use LoaderOptionsPlugin to set options.worker.plugins (https://github.com/webpack-contrib/worker-loader/blob/v0.8.0/index.js#L42), but when I use that to add new webpack.optimize.UglifyJsPlugin({}) to options.worker.plugins, I get this error:

Module build failed: TypeError: Cannot read property 'replace' of undefined
    at new RequestShortener (node_modules/webpack/lib/RequestShortener.js:11:24)
    at UglifyJsPlugin.apply (node_modules/uglifyjs-webpack-plugin/dist/index.js:40:27)
    at Compiler.apply (node_modules/tapable/lib/Tapable.js:306:16)
    at options.plugins.forEach.plugin (node_modules/worker-loader/index.js:52:54)
    at Array.forEach (native)
    at Object.pitch (node_modules/worker-loader/index.js:52:21)

I'm using webpack 3.5.6

LoaderOptionsPlugin config:

new webpack.LoaderOptionsPlugin({
	options: {
		// context: path.resolve(__dirname, ".."),
		worker:  {
			plugins: [
				new webpack.optimize.UglifyJsPlugin({
					compress: {
						warnings: false,
					},
					sourceMap: false,
				}),
			],
		},
	},
}),

I tried with and without context in LoaderOptionsPlugin, it fails with the same error either way.

[nkovacs]

I was wrong. UglifyJsPlugin is applied to the child compilation, but uglifyjs throws an error, and that error isn't shown: https://github.com/webpack-contrib/uglifyjs-webpack-plugin/blob/v0.4.6/src/index.js#L211
Maybe the errors aren't propagated properly to the parent compilation?

The error is caused by a let. It looks like babel-loader did not transform the code. My loader config looks like this:

{
	test:    /\.js$/,
	loader:  "babel-loader",
	include: [resolve("src"), resolve("test")],
	rules:   [{
		test:    /\.worker\.js$/,
		loader:  "worker-loader",
		include: [resolve("src"), resolve("test")],
		options: {
			name: utils.assetsPath("js/[hash].worker.js"),
		},
	}],
},

[nkovacs]

The order was wrong. Both of these work:

{
	test:    /\.worker\.js$/,
	loader:  "worker-loader",
	include: [resolve("src"), resolve("test")],
	options: {
		name: utils.assetsPath("js/[hash].worker.js"),
	},
},
{
	test:    /\.js$/,
	loader:  "babel-loader",
	include: [resolve("src"), resolve("test")],
},

{
	test:    /\.js$/,
	loader:  "babel-loader",
	include: [resolve("src"), resolve("test")],
	rules:   [{
		test:    /\.worker\.js$/,
		loader:  "worker-loader",
		enforce: "post",
		include: [resolve("src"), resolve("test")],
		options: {
			name: utils.assetsPath("js/[hash].worker.js"),
		},
	}],
},