Fixed

You didn't specify what your function should return. Although it seems you've solved the problem.

At least Function constructor is safer than eval.

Updated to Node v14

There is assert.deepEqual, no need to write your own assertion.

Why is Function.prototype.toString disabled?

Oh, I see. I guess I'll just replace it with let x; instead of removing it completely.

What do you mean by that?

You can't, because assert.deepEqual([1,2], [2,1]) will fail.

Updated to Node v14

Updated to Node v14

it doesn't. "shadowing" implies overwriting, which is not the case here.

JS: Node v14 should be used along with its appropiate assertion tools (Mocha + Chai).
Refer to this and this

Okay, I've fixed that in the new fork. Thanks for reminding.

Oh, crap. My bad. I forgot that the task is actually to assign "a", not "Uh-oh!". "Uh-oh!" is the message you'll get if your solution fails.