Which document served as the constitutional framework for Pakistan before the adoption of its first constitution?

Which document served as the constitutional framework for Pakistan before the adoption of its first constitution?

پاکستان کے پہلے آئین کو اپنانے سے پہلے کون سی دستاویز آئینی فریم ورک کے طور پر کام کرتی تھی؟
Explanation

The Government of India Act 1935 served as the constitutional framework for Pakistan before the adoption of its first constitution.

This act provided the basis for governance in the early years of Pakistan's independence.