add typeof()

Author: fadrian06

src/Operators/typeof.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+/** @param mixed $value TODO: Specify type */
+function typeof($value): string {
+  if ($value instanceof JSString) {
+    $reflectionClass = new ReflectionClass($value);
+    $isPrimitiveProperty = $reflectionClass->getProperty('isPrimitive');
+    $isPrimitiveProperty->setAccessible(true);
+    $isPrimitive = (bool) $isPrimitiveProperty->getValue($value);
+
+    if ($isPrimitive) {
+      return 'string';
+    }
+  }
+
+  return 'object';
+}