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node_modules/watchpack/lib/getWatcherManager.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const path = require("path");
+const DirectoryWatcher = require("./DirectoryWatcher");
+
+/** @typedef {import("./index").EventMap} EventMap */
+/** @typedef {import("./DirectoryWatcher").DirectoryWatcherOptions} DirectoryWatcherOptions */
+/** @typedef {import("./DirectoryWatcher").DirectoryWatcherEvents} DirectoryWatcherEvents */
+/** @typedef {import("./DirectoryWatcher").FileWatcherEvents} FileWatcherEvents */
+/**
+ * @template {EventMap} T
+ * @typedef {import("./DirectoryWatcher").Watcher<T>} Watcher
+ */
+
+class WatcherManager {
+	/**
+	 * @param {DirectoryWatcherOptions=} options options
+	 */
+	constructor(options = {}) {
+		this.options = options;
+		/** @type {Map<string, DirectoryWatcher>} */
+		this.directoryWatchers = new Map();
+	}
+
+	/**
+	 * @param {string} directory a directory
+	 * @returns {DirectoryWatcher} a directory watcher
+	 */
+	getDirectoryWatcher(directory) {
+		const watcher = this.directoryWatchers.get(directory);
+		if (watcher === undefined) {
+			const newWatcher = new DirectoryWatcher(this, directory, this.options);
+			this.directoryWatchers.set(directory, newWatcher);
+			newWatcher.on("closed", () => {
+				this.directoryWatchers.delete(directory);
+			});
+			return newWatcher;
+		}
+		return watcher;
+	}
+
+	/**
+	 * @param {string} file file
+	 * @param {number=} startTime start time
+	 * @returns {Watcher<FileWatcherEvents> | null} watcher or null if file has no directory
+	 */
+	watchFile(file, startTime) {
+		const directory = path.dirname(file);
+		if (directory === file) return null;
+		return this.getDirectoryWatcher(directory).watch(file, startTime);
+	}
+
+	/**
+	 * @param {string} directory directory
+	 * @param {number=} startTime start time
+	 * @returns {Watcher<DirectoryWatcherEvents>} watcher
+	 */
+	watchDirectory(directory, startTime) {
+		return this.getDirectoryWatcher(directory).watch(directory, startTime);
+	}
+}
+
+const watcherManagers = new WeakMap();
+
+/**
+ * @param {DirectoryWatcherOptions} options options
+ * @returns {WatcherManager} the watcher manager
+ */
+module.exports = (options) => {
+	const watcherManager = watcherManagers.get(options);
+	if (watcherManager !== undefined) return watcherManager;
+	const newWatcherManager = new WatcherManager(options);
+	watcherManagers.set(options, newWatcherManager);
+	return newWatcherManager;
+};
+module.exports.WatcherManager = WatcherManager;