npm and error messages

node_modules/webpack/lib/util/SortableSet.js

@@ -0,0 +1,45 @@
+"use strict";
+
+module.exports = class SortableSet extends Set {
+
+	constructor(initialIterable, defaultSort) {
+		super(initialIterable);
+		this._sortFn = defaultSort;
+		this._lastActiveSortFn = null;
+	}
+
+	/**
+	 * @param {any} value - value to add to set
+	 * @returns {SortableSet} - returns itself
+	 */
+	add(value) {
+		this._lastActiveSortFn = null;
+		super.add(value);
+		return this;
+	}
+
+	/**
+	 * @param {Function} sortFn - function to sort the set
+	 * @returns {void}
+	 */
+	sortWith(sortFn) {
+		if(this.size === 0 || sortFn === this._lastActiveSortFn) {
+			// already sorted - nothing to do
+			return;
+		}
+
+		const sortedArray = Array.from(this).sort(sortFn);
+		super.clear();
+		for(let i = 0; i < sortedArray.length; i += 1) {
+			this.add(sortedArray[i]);
+		}
+		this._lastActiveSortFn = sortFn;
+	}
+
+	/**
+	 * @returns {void}
+	 */
+	sort() {
+		this.sortWith(this._sortFn);
+	}
+};