webpack/lib/WatchIgnorePlugin.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 validateOptions = require("schema-utils");
const schema = require("../schemas/plugins/WatchIgnorePlugin.json");

/** @typedef {import("../declarations/plugins/WatchIgnorePlugin").WatchIgnorePluginOptions} WatchIgnorePluginOptions */

class IgnoringWatchFileSystem {
	constructor(wfs, paths) {
		this.wfs = wfs;
		this.paths = paths;
	}

	watch(files, dirs, missing, startTime, options, callback, callbackUndelayed) {
		const ignored = path =>
			this.paths.some(p =>
				p instanceof RegExp ? p.test(path) : path.indexOf(p) === 0
			);

		const notIgnored = path => !ignored(path);

		const ignoredFiles = files.filter(ignored);
		const ignoredDirs = dirs.filter(ignored);

		const watcher = this.wfs.watch(
			files.filter(notIgnored),
			dirs.filter(notIgnored),
			missing,
			startTime,
			options,
			(
				err,
				filesModified,
				dirsModified,
				missingModified,
				fileTimestamps,
				dirTimestamps,
				removedFiles
			) => {
				if (err) return callback(err);
				for (const path of ignoredFiles) {
					fileTimestamps.set(path, 1);
				}

				for (const path of ignoredDirs) {
					dirTimestamps.set(path, 1);
				}

				callback(
					err,
					filesModified,
					dirsModified,
					missingModified,
					fileTimestamps,
					dirTimestamps,
					removedFiles
				);
			},
			callbackUndelayed
		);

		return {
			close: () => watcher.close(),
			pause: () => watcher.pause(),
			getContextTimestamps: () => {
				const dirTimestamps = watcher.getContextTimestamps();
				for (const path of ignoredDirs) {
					dirTimestamps.set(path, 1);
				}
				return dirTimestamps;
			},
			getFileTimestamps: () => {
				const fileTimestamps = watcher.getFileTimestamps();
				for (const path of ignoredFiles) {
					fileTimestamps.set(path, 1);
				}
				return fileTimestamps;
			}
		};
	}
}

class WatchIgnorePlugin {
	/**
	 * @param {WatchIgnorePluginOptions} paths list of paths
	 */
	constructor(paths) {
		validateOptions(schema, paths, "Watch Ignore Plugin");
		this.paths = paths;
	}

	apply(compiler) {
		compiler.hooks.afterEnvironment.tap("WatchIgnorePlugin", () => {
			compiler.watchFileSystem = new IgnoringWatchFileSystem(
				compiler.watchFileSystem,
				this.paths
			);
		});
	}
}

module.exports = WatchIgnorePlugin;