'noImplicitReturns' doesn't report an error if any branch returns 'any'

[DanielRosenwasser]

The following correctly reports an error on foo under noImplicitReturns.

function foo(y: number, z: number) {
    if (y)
        return z;
}

However, removing the type annotations from y and z squelches the error.

function foo(y, z) {
    if (y)
        return z;
}

[vladima]

Discussed offline with @mhegazy and @billti - current behavior for .ts files is by design - we don't report noImplicitReturns error if inferred return type is any or void. It makes sense however to report it for .js files and we already have an issue to track this. Closing this one in favor of it.