1 files changed, 46 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/util/Queue.js b/node_modules/webpack/lib/util/Queue.js
new file mode 100644
index 0000000..6615e9f
--- /dev/null
+++ b/node_modules/webpack/lib/util/Queue.js
@@ -0,0 +1,46 @@
+"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;