Wrong checking return type from function

[snatvb]

type A = {
  a: boolean;
}
type B = (v: A) => A

const c: B = (a) => {
  return { a: true, asd: 235 }
}

Why I don't have error?

But if I will write such code, then I get error:

const f = (v: A): A => {
  return { a: true, asd: 235 }
}

[jack-williams]

Duplicate of #241/#29390/#30198. (The first issue might not look immediately related but it's the root cause).

[snatvb]

@jack-williams how i understand, this problem will not be solved, becouse first post was in 2014, right?

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.