import { isPlainObject, isUndefined } from "../predicate/predicate.js";
//#region src/object/deep-equal.ts
/**
* Deep structural equality for plain objects, arrays, and primitives. Keys
* explicitly set to `undefined` are treated as absent (matching JSON
* semantics), leaf values are compared with `Object.is`, and non-plain
* objects (class instances, Maps, Sets, etc.) are only equal by reference.
*
* @example
* ```ts
* deepEqual({ a: [1, { b: 2 }] }, { a: [1, { b: 2 }] }); // true
* deepEqual({ a: 1, b: undefined }, { a: 1 }); // true
* ```
*/
function deepEqual(a, b) {
	if (Object.is(a, b)) return true;
	if (Array.isArray(a) || Array.isArray(b)) return Array.isArray(a) && Array.isArray(b) && a.length === b.length && a.every((value, i) => deepEqual(value, b[i]));
	if (!isPlainObject(a) || !isPlainObject(b)) return false;
	const keysA = Object.keys(a).filter((key) => !isUndefined(a[key]));
	const keysB = Object.keys(b).filter((key) => !isUndefined(b[key]));
	return keysA.length === keysB.length && keysA.every((key) => deepEqual(a[key], b[key]));
}
//#endregion
export { deepEqual };

//# sourceMappingURL=deep-equal.js.map