Add `SetReadonly` about type-fest

[Shinigami92]

@Shinigami92 Hey! Are you looking for something similar to this ? If so, I suppose I have a simpler solution:

type ReadonlyObject<BaseType> = {
  readonly [Key in keyof BaseType] : BaseType[Key];
}

This solution works for nested objects.

No, that doesn't look right for my need
I need to partially select what should be readonly and the rest should not be touched

[Shinigami92]

Not 100% sure if this is correct, but I think following is working:

export type SetReadonly<BaseType, Keys extends keyof BaseType> = Simplify<
  Except<BaseType, Keys> & Readonly<Pick<BaseType, Keys>>
>;

[Bismay5467]

@Shinigami92 Hey! Are you looking for something similar to this ?
If so, I suppose I have a simpler solution:

type ReadonlyObject<BaseType> = {
  readonly [Key in keyof BaseType] : BaseType[Key];
}

This solution works for nested objects.