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

	"use strict";

	/**
	* @template T
	*/
	class Queue {
	/**
	* @param {Iterable<T>=} items The initial elements.
	*/
	constructor(items) {
	/** @private @type {Set<T>} */
	this._set = new Set(items);
	/** @private @type {Iterator<T>} */
	this._iterator = this._set[Symbol.iterator]();
	}

	/**
	* Returns the number of elements in this queue.
	* @returns {number} The number of elements in this queue.
	*/
	get length() {
	return this._set.size;
	}

	/**
	* Appends the specified element to this queue.
	* @param {T} item The element to add.
	* @returns {void}
	*/
	enqueue(item) {
	this._set.add(item);
	}

	/**
	* Retrieves and removes the head of this queue.
	* @returns {T \| undefined} The head of the queue of `undefined` if this queue is empty.
	*/
	dequeue() {
	const result = this._iterator.next();
	if (result.done) return undefined;
	this._set.delete(result.value);
	return result.value;
	}
	}

	module.exports = Queue;