Include false in Typescript factory return definition

[rijk]

May I suggest we add false as well? It already works (the code does a falsy check), and in some cases it allows for cleaner code — up to the user's preference of course:

useSubscription(() => boardId && Meteor.subscribe('board', boardId), [boardId])

You don't have to use it like this, but as the code allows it I see no reason for Typescript to give a warning. Hope you'll consider. Thanks!

[rijk]

Rebased on your latest push.

[CaptainN]

I'm not apposed to this, but maybe null instead? In Typescript null makes more sense, and of course, any "falsy" value will work just fine in JS. This is a great addition.

[CaptainN]

I think this has been superseded by other decisions.