From bbff7403fbf46f9ad92240ac213df8d30ef31b64 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Thu, 20 Sep 2018 02:56:13 +0200
Subject: update packages

---
 node_modules/webpack/lib/util/Queue.js | 88 ++++++++++++++++++----------------
 1 file changed, 46 insertions(+), 42 deletions(-)

(limited to 'node_modules/webpack/lib/util/Queue.js')

diff --git a/node_modules/webpack/lib/util/Queue.js b/node_modules/webpack/lib/util/Queue.js
index ef3ffdc80..6615e9f77 100644
--- a/node_modules/webpack/lib/util/Queue.js
+++ b/node_modules/webpack/lib/util/Queue.js
@@ -1,42 +1,46 @@
-"use strict";
-
-module.exports = class Queue {
-	constructor(items) {
-		this.first = null;
-		this.last = null;
-		this.length = 0;
-		if(items) {
-			for(const item of items) {
-				this.enqueue(item);
-			}
-		}
-	}
-
-	enqueue(item) {
-		const first = this.first;
-		const node = {
-			item,
-			next: null
-		};
-		if(first === null) {
-			this.last = node;
-		} else {
-			first.next = node;
-		}
-		this.first = node;
-		this.length++;
-	}
-
-	dequeue() {
-		const last = this.last;
-		if(last === null)
-			return undefined;
-		const next = last.next;
-		if(next === null) {
-			this.first = null;
-		}
-		this.last = next;
-		this.length--;
-		return last.item;
-	}
-};
+"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;
-- 
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