Updated the files.

my-app/node_modules/webpack/lib/util/ArrayHelpers.js

@@ -0,0 +1,44 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/**
+ * Compare two arrays or strings by performing strict equality check for each value.
+ * @template T [T=any]
+ * @param {ArrayLike<T>} a Array of values to be compared
+ * @param {ArrayLike<T>} b Array of values to be compared
+ * @returns {boolean} returns true if all the elements of passed arrays are strictly equal.
+ */
+
+exports.equals = (a, b) => {
+	if (a.length !== b.length) return false;
+	for (let i = 0; i < a.length; i++) {
+		if (a[i] !== b[i]) return false;
+	}
+	return true;
+};
+
+/**
+ * Partition an array by calling a predicate function on each value.
+ * @template T [T=any]
+ * @param {Array<T>} arr Array of values to be partitioned
+ * @param {(value: T) => boolean} fn Partition function which partitions based on truthiness of result.
+ * @returns {[Array<T>, Array<T>]} returns the values of `arr` partitioned into two new arrays based on fn predicate.
+ */
+exports.groupBy = (arr = [], fn) => {
+	return arr.reduce(
+		/**
+		 * @param {[Array<T>, Array<T>]} groups An accumulator storing already partitioned values returned from previous call.
+		 * @param {T} value The value of the current element
+		 * @returns {[Array<T>, Array<T>]} returns an array of partitioned groups accumulator resulting from calling a predicate on the current value.
+		 */
+		(groups, value) => {
+			groups[fn(value) ? 0 : 1].push(value);
+			return groups;
+		},
+		[[], []]
+	);
+};