Preact: TypeScript: `render`'s first arg needs to be nullable

[dcporter]

In order to remove an element, I need to be able to do render(null, parentEl, elToRemove). In the typings file, render’s first argument is typed Element, which is non-nullable, precluding passing in null. This is preventing me from removing elements from a TypeScript project. The source suggests that this argument can be null, undefined, a boolean (?), a string or a number.

(I haven't gotten this far yet, but I assume that if render returns the rendered element, and I'm removing things, it an also return null, which means the function’s return type also needs to be nullable.) (Sounds like no problem on the return type.)

[developit]

Rendering null will return an empty text node.

[dcporter]

Cool, probably no problem on the return type side then. I updated the issue to reflect.

[developit]

@dcporter Want to PR the nullable arg bit?

[wuweiweiwu]

@developit Done :)