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node_modules/webpack/lib/util/Queue.js

@@ -1,42 +1,46 @@
 "use strict";
 
-module.exports = class Queue {
+/**
+ * @template T
+ */
+class Queue {
+	/**
+	 * @param {Iterable<T>=} items The initial elements.
+	 */
 	constructor(items) {
-		this.first = null;
-		this.last = null;
-		this.length = 0;
-		if(items) {
-			for(const item of items) {
-				this.enqueue(item);
-			}
-		}
+		/** @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) {
-		const first = this.first;
-		const node = {
-			item,
-			next: null
-		};
-		if(first === null) {
-			this.last = node;
-		} else {
-			first.next = node;
-		}
-		this.first = node;
-		this.length++;
+		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 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;
+		const result = this.iterator.next();
+		if (result.done) return undefined;
+		this.set.delete(result.value);
+		return result.value;
 	}
-};
+}
+
+module.exports = Queue;