Add types to compat

[pmkroeker]

This is still a WIP of adding export types with preact/compat for those that wish to use import things directly through compat.

Some things are still being hashed out, but wanted some feedback.

Related #1608

[marvinhagemeister]

Awesome, this is a really great start 👍 💯 All types are there and we just need to make sure we're consistent and keep the types for props 👍 One nit: We don't have a space after a function name in our whole codebase: function foo () {} should be formatted like function foo() {}. Left a few comments with ideas for more type-safe declarations. Let me know what you think 🙂

[pmkroeker]

@marvinhagemeister thanks. Ya this is my first foray into adding types to a larger package. And I'll fix the spacing thing too!

[pmkroeker]

I just changed over from using PreactElement to Element. I pulled some of the initial typings from the JSDoc comments, but it seems like some of the places that use PreactElement in fact require just Element (mostly due do passing something like document.querySelector('#root').

@marvinhagemeister does this seem ok?

[coveralls]

Coverage remained the same at 100.0% when pulling e7286df on pmkroeker:master into 4aabebb on developit:master.

[JoviDeCroock]

Nice, This is looking great 👍

[marvinhagemeister]

It's coming along very well! I'd just add the default export like mentioned in the comments and than it's ready to be merged in my opinion 👍

[pmkroeker]

I did some testing and it seems as though the way the index.js file is created, TS is able to map the definitions to a default export as well.

import React, { createPortal } from 'preact/compat';

React.createPortal(); // gives missing args, vnode not provided
createPortal(); // same message as above

Both of those behave the same, plus intellisense over React shows all the appropriate methods.

[marvinhagemeister]

Sweet ⚡✔️