feat: add TypeScript definitions

[Ermakoy]

closes #79

[gregberge]

Awesome! Thanks! Nothing to add in package.json?

@theKashey, could you give a look if types look right for you? I prefer to have a second look and I am not very good in TypeScript 🙏

[theKashey]

This is HUGE!
d.ts is looking good, but it is not used anywhere, especially in -sc,-em packages.

[Ermakoy]

@theKashey
I have lookup for other libraries with external TS typings (like postcss) and they somehow get their d.ts file shipped with other package files.

We can add "types": "dist/index.d.ts" into -em and -sc package.json and include definition file in rollup build phase

Will try to do this in minimal painful way

[gregberge]

@Ermakoy are you still working on it?

[Ermakoy]

@neoziro
Yep. I have solution, but have not committed it yet

[Ermakoy]

@neoziro
Came up with this ^

[theKashey]

they somehow get their d.ts file shipped with other package files.

d.ts resolution is separated from "normal" resolution. You may place index.d.ts in the rootDir, you may place server.d.ts to handle mypackage/server, even if "the real file" would be mypackage/server/index.js. And you always could use types field in the package.json.

DefinitelyTyped recommends storing your types in /types dir, but... that's quite strange rule. If your project is written in TS - your types would be stored next to your js files, thus dist is a good location.

[Ermakoy]

@theKashey
fixed core-sc package.json

[Ermakoy]

@neoziro @theKashey
Any updates?

[theKashey]

Looking good for me. The change is too big to verify every single line, but - I am good to go 👍

[gregberge]

Thanks for the review and thanks for you work! I will merge it and publish it!