feat: Added Set::keys() method

src/JavaScript/Set.php

@@ -147,6 +147,18 @@ public function has(mixed $value): bool
         return in_array($value, $this->items, true);
     }
 
+    /**
+     * Returns Set keys as SetIterator.
+     * Alias for the values()
+     * @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/keys
+     *
+     * @return \Rudashi\JavaScript\SetIterator<int, TValue>
+     */
+    public function keys(): SetIterator
+    {
+        return $this->values();
+    }
+
     /**
      * @return array<int, TValue>
      */

tests/Unit/SetTest.php

@@ -378,6 +378,17 @@
     ['bar', true],
 ]);
 
+describe('keys', function () {
+    it('returns new SetIterator', function () {
+        $set = new Set(['foo', 'bar']);
+
+        expect($set->keys())
+            ->toBeInstanceOf(SetIterator::class)
+            ->current()?->toBe('foo')
+            ->next()?->toBe('bar');
+    });
+});
+
 describe('values', function () {
     it('returns new SetIterator', function () {
         $set = new Set(['foo', 'bar']);