TypeScript support

[kurai-espoir]

It would be great if you added support for TypeScript users

EDIT:
I didn't realized there was a types directory. Consider renaming the files from *.js to *.d.ts?

[xtuc]

I believe this types are used by webpack, if we rename the file we need to ensure webpack doesn't break.

Would you mind sending a PR?

[kurai-espoir]

Sure. I'll send one by this week.

[pcardune]

I believe the files in the types directory are only for flowtype and will need more than renaming to make them work with typescript. I'm also interested in having typescript type declarations. Let me know if you'd like some help @kurai-espoir

[xtuc]

Long term I think we should remove flow in the repo and replace with typescript.

[gustavohenke]

Hi @xtuc, how do you see this happening -- by rewriting everything to TS, or by keeping the code as JS + adding TS types?