thingies

parts/3/phonebookBackend/node_modules/eslint/lib/shared/option-utils.js

@@ -0,0 +1,63 @@
+/**
+ * @fileoverview Utilities to operate on option objects.
+ * @author Josh Goldberg
+ */
+
+"use strict";
+
+/**
+ * Determines whether any of input's properties are different
+ * from values that already exist in original.
+ * @template T
+ * @param {Partial<T>} input New value.
+ * @param {T} original Original value.
+ * @returns {boolean} Whether input includes an explicit difference.
+ */
+function containsDifferentProperty(input, original) {
+	if (input === original) {
+		return false;
+	}
+
+	if (
+		typeof input !== typeof original ||
+		Array.isArray(input) !== Array.isArray(original)
+	) {
+		return true;
+	}
+
+	if (Array.isArray(input)) {
+		return (
+			input.length !== original.length ||
+			input.some((value, i) =>
+				containsDifferentProperty(value, original[i]),
+			)
+		);
+	}
+
+	if (typeof input === "object") {
+		if (input === null || original === null) {
+			return true;
+		}
+
+		const inputKeys = Object.keys(input);
+		const originalKeys = Object.keys(original);
+
+		return (
+			inputKeys.length !== originalKeys.length ||
+			inputKeys.some(
+				inputKey =>
+					!Object.hasOwn(original, inputKey) ||
+					containsDifferentProperty(
+						input[inputKey],
+						original[inputKey],
+					),
+			)
+		);
+	}
+
+	return true;
+}
+
+module.exports = {
+	containsDifferentProperty,
+};