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1 files changed, 48 insertions, 0 deletions

diff --git a/node_modules/webpack/lib/util/SetHelpers.js b/node_modules/webpack/lib/util/SetHelpers.js
new file mode 100644
index 00000000..96c063c7
--- /dev/null
+++ b/node_modules/webpack/lib/util/SetHelpers.js
@@ -0,0 +1,48 @@
+"use strict";
+
+/**
+ * intersect creates Set containing the intersection of elements between all sets
+ * @param {Set[]} sets an array of sets being checked for shared elements
+ * @returns {Set<TODO>} returns a new Set containing the intersecting items
+ */
+const intersect = sets => {
+	if (sets.length === 0) return new Set();
+	if (sets.length === 1) return new Set(sets[0]);
+	let minSize = Infinity;
+	let minIndex = -1;
+	for (let i = 0; i < sets.length; i++) {
+		const size = sets[i].size;
+		if (size < minSize) {
+			minIndex = i;
+			minSize = size;
+		}
+	}
+	const current = new Set(sets[minIndex]);
+	for (let i = 0; i < sets.length; i++) {
+		if (i === minIndex) continue;
+		const set = sets[i];
+		for (const item of current) {
+			if (!set.has(item)) {
+				current.delete(item);
+			}
+		}
+	}
+	return current;
+};
+
+/**
+ * Checks if a set is the subset of another set
+ * @param {Set<TODO>} bigSet a Set which contains the original elements to compare against
+ * @param {Set<TODO>} smallSet the set whos elements might be contained inside of bigSet
+ * @returns {boolean} returns true if smallSet contains all elements inside of the bigSet
+ */
+const isSubset = (bigSet, smallSet) => {
+	if (bigSet.size < smallSet.size) return false;
+	for (const item of smallSet) {
+		if (!bigSet.has(item)) return false;
+	}
+	return true;
+};
+
+exports.intersect = intersect;
+exports.isSubset = isSubset;