What value does the assignment evalute to?

[bakkot]

(From plenary, just capturing here since I don't see it anywhere.)

Consider:

let x = a?.b = c;

What value does x get?

(One possible solution is to say that this operator is only legal in statement position, though that's a little awkward to specify.)

[zaygraveyard]

My intuition matches the proposed de-sugaring in the README:

let x = (a == null ? undefined : a.b = c);