Current TypeScript Version: 2.1.1

We have a syntax to add "readonly" to every property of a type. Unfortunately, it seems there is no way to have the reverse operation: removing it.
This is useful for creating Mocked version of types for UTs, which have readonly fields in production.

This should work recursively.

Code

interface MyType2 { readonly z1: number; z2: string; } interface MyType { readonly a: number; readonly b: MyType2; c: string; d: MyType2; } type Mock<T> { [P in keyofwithoutmodifiers T]: Mock<T[P]>; } type MyMockedType = Mock<MyType>;

Expected behavior:
type MyMockedType to be

{ a: number; b: { z1: number; z2: string }; c: string; d: { z1: number; z2: string }; }

Actual behavior:
not possible right now