webpack/lib/MultiWatching.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const asyncLib = require("neo-async");

/** @typedef {import("./MultiCompiler")} MultiCompiler */
/** @typedef {import("./Watching")} Watching */

/**
 * @template T
 * @callback Callback
 * @param {(Error | null)=} err
 * @param {T=} result
 */

class MultiWatching {
	/**
	 * @param {Watching[]} watchings child compilers' watchers
	 * @param {MultiCompiler} compiler the compiler
	 */
	constructor(watchings, compiler) {
		this.watchings = watchings;
		this.compiler = compiler;
	}

	/**
	 * @param {Callback<void>=} callback signals when the build has completed again
	 * @returns {void}
	 */
	invalidate(callback) {
		if (callback) {
			asyncLib.each(
				this.watchings,
				(watching, callback) => watching.invalidate(callback),
				callback
			);
		} else {
			for (const watching of this.watchings) {
				watching.invalidate();
			}
		}
	}

	suspend() {
		for (const watching of this.watchings) {
			watching.suspend();
		}
	}

	resume() {
		for (const watching of this.watchings) {
			watching.resume();
		}
	}

	/**
	 * @param {Callback<void>} callback signals when the watcher is closed
	 * @returns {void}
	 */
	close(callback) {
		asyncLib.forEach(
			this.watchings,
			(watching, finishedCallback) => {
				watching.close(finishedCallback);
			},
			err => {
				this.compiler.hooks.watchClose.call();
				if (typeof callback === "function") {
					this.compiler.running = false;
					callback(err);
				}
			}
		);
	}
}

module.exports = MultiWatching;