Rename to webpack-plugin

webpack-plugin/src/plugins/AddWorkerEntryPointPlugin.ts

@@ -0,0 +1,63 @@
+import type * as webpack from 'webpack';
+
+export interface IAddWorkerEntryPointPluginOptions {
+	id: string;
+	entry: string;
+	filename: string;
+	chunkFilename?: string;
+	plugins: webpack.WebpackPluginInstance[];
+}
+
+function getCompilerHook(
+	compiler: webpack.Compiler,
+	{ id, entry, filename, chunkFilename, plugins }: IAddWorkerEntryPointPluginOptions
+) {
+	const webpack = compiler.webpack ?? require('webpack');
+
+	return function (
+		compilation: webpack.Compilation,
+		callback: (error?: Error | null | false) => void
+	) {
+		const outputOptions = {
+			filename,
+			chunkFilename,
+			publicPath: compilation.outputOptions.publicPath,
+			// HACK: globalObject is necessary to fix https://github.com/webpack/webpack/issues/6642
+			globalObject: 'this'
+		};
+		const childCompiler = compilation.createChildCompiler(id, outputOptions, [
+			new webpack.webworker.WebWorkerTemplatePlugin(),
+			new webpack.LoaderTargetPlugin('webworker')
+		]);
+		const SingleEntryPlugin = webpack.EntryPlugin ?? webpack.SingleEntryPlugin;
+		new SingleEntryPlugin(compiler.context, entry, 'main').apply(childCompiler);
+		plugins.forEach((plugin) => plugin.apply(childCompiler));
+
+		childCompiler.runAsChild((err?: Error) => callback(err));
+	};
+}
+
+export class AddWorkerEntryPointPlugin implements webpack.WebpackPluginInstance {
+	private readonly options: IAddWorkerEntryPointPluginOptions;
+
+	constructor({
+		id,
+		entry,
+		filename,
+		chunkFilename = undefined,
+		plugins
+	}: IAddWorkerEntryPointPluginOptions) {
+		this.options = { id, entry, filename, chunkFilename, plugins };
+	}
+
+	apply(compiler: webpack.Compiler) {
+		const webpack = compiler.webpack ?? require('webpack');
+		const compilerHook = getCompilerHook(compiler, this.options);
+		const majorVersion = webpack.version.split('.')[0];
+		if (parseInt(majorVersion) < 4) {
+			(<any>compiler).plugin('make', compilerHook);
+		} else {
+			compiler.hooks.make.tapAsync('AddWorkerEntryPointPlugin', compilerHook);
+		}
+	}
+}