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");

	class WatcherManager {
	constructor(options) {
	this.options = options;
	this.directoryWatchers = new Map();
	}

	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;
	}

	watchFile(p, startTime) {
	const directory = path.dirname(p);
	if (directory === p) return null;
	return this.getDirectoryWatcher(directory).watch(p, startTime);
	}

	watchDirectory(directory, startTime) {
	return this.getDirectoryWatcher(directory).watch(directory, startTime);
	}
	}

	const watcherManagers = new WeakMap();
	/**
	* @param {object} 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;