emit d.cts files in src/cjs

[Nesopie]

• Adds separate types for cjs and esm in package.json
• tsconfig.base.json emits type declarations
• changed the postbuild command to convert .d.ts files to .d.cts

[junderw]

Await review by @arijoon

[junderw]

LGTM...

No clue how to test these weird packaging/transpiling issues.

We would need to have some CI that uses combinations of nodeJS versions, TS versions, webpack versions, etc etc etc and make sure all the combinations work...

It seems like newer versions of NodeJS have some new package.json keys that help with hybrid packages, but we don't want to bump the minimum NodeJS version too high.

[arijoon]

Thanks a lot, much appreciated. Tested against this repo by building this and packing locally, then installing it and works perfectly well

This lead me to find the issue also doesn't exist if typescript flag importHelpers is set to false. But we had this as true which manifests this issue. Worth noting importHelpers requires addition of tslib on the consumer side

[junderw]

Thanks for the importHelpers tip.