Bind does not preserve function return type

[Jameskmonger]

TypeScript Version: 2.4.0

Code

function foo<T>(provider: () => T): T { return undefined; }
function giveMeTrue(): boolean { return true; }

const okay: boolean = foo(giveMeTrue); // okay
const notOkay: boolean = foo(giveMeTrue.bind(this)); // type '{}' is not assignable to type 'boolean'

Expected behavior:

Both should be okay - bind does not change the return type of the function.

Actual behavior:

bind changes the function return type to any.

[jesseschalken]

There relevant line is here: https://github.com/Microsoft/TypeScript/blob/b162097c3c7f5e5174eb70124de8888669775dbd/lib/lib.d.ts#L271

Should it return this?

[kitsonk]

Dupe of #212

[Jameskmonger]

Closed as duplicate of #212