Arguments spread doesn't take into account actual array length

[sebek64]

TypeScript Version: 2.6.0-rc, 2.7.0-dev.20171021

Code

function a(first: string, ...args: string[]);
function a(...args: string[]) {
}

const b = ["a", "x"];

if (a.length > 0) {
    a(...b);
}

Expected behavior:
Should not produce error.

Actual behavior:
Produces
error TS2557: Expected at least 1 arguments, but got a minimum of 0.

[Ghabriel]

I created an issue yesterday that seems to be about the same problem: #19403
No answers yet, though. Nice to know that I'm not the only one who encountered this problem.

[sebek64]

@Ghabriel oops, I checked for duplicities a few days ago and found nothing. Today, I just reported the problem.

[mhegazy]

Duplicate of #4130

[mhegazy]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.