Function equal

assert/equal.ts:112–224

(a: unknown, b: unknown)

 * ```
 */
export function equal(a: unknown, b: unknown): boolean {
  const seen = new Map<unknown, unknown>();
  return (function compare(a: unknown, b: unknown): boolean {
    if (sameValueZero(a, b)) return true;
    if (isPrimitive(a) || isPrimitive(b)) return false;

    if (a instanceof Date && b instanceof Date) {
      return Object.is(a.getTime(), b.getTime());
    }
    if (a && typeof a === "object" && b && typeof b === "object") {
      if (!prototypesEqual(a, b)) {
        return false;
      }
      if (a instanceof TypedArray) {
        return compareTypedArrays(a as TypedArray, b as TypedArray);
      }
      if (
        a instanceof ArrayBuffer ||
        (globalThis.SharedArrayBuffer && a instanceof SharedArrayBuffer)
      ) {
        return compareTypedArrays(
          new Uint8Array(a),
          new Uint8Array(b as ArrayBuffer | SharedArrayBuffer),
        );
      }
      if (a instanceof WeakMap) {
        throw new TypeError("Cannot compare WeakMap instances");
      }
      if (a instanceof WeakSet) {
        throw new TypeError("Cannot compare WeakSet instances");
      }
      if (a instanceof WeakRef) {
        return compare(a.deref(), (b as WeakRef<WeakKey>).deref());
      }
      if (seen.get(a) === b) {
        return true;
      }
      if (Object.keys(a).length !== Object.keys(b).length) {
        return false;
      }
      seen.set(a, b);
      if (isKeyedCollection(a) && isKeyedCollection(b)) {
        if (a.size !== b.size) {
          return false;
        }

        const aKeys = [...a.keys()];
        const primitiveKeysFastPath = aKeys.every(isPrimitive);
        if (primitiveKeysFastPath) {
          if (a instanceof Set) {
            return a.symmetricDifference(b).size === 0;
          }

          for (const key of aKeys) {
            if (
              !b.has(key) ||
              !compare(a.get(key), (b as Map<unknown, unknown>).get(key))
            ) {