webpack/lib/MultiWatching.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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=} 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;
	}

	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;