nodenext compatibility, correct typings

[Uzlopak]

Part of Migration of the infamous triplet to next level, Nodenext support

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

CI seems failing

[Uzlopak]

The original typings are wrong. Currently checking

[Uzlopak]

Ok, fixed the typings. They were from the beginning wrong. So I assume, nobody uses fast-json-stringify-compiler in a typescript environment.

I had to change the purpose of some typings, which means, that it could be a breaking change. But on the other hand, as mentioned before, nobody complained about the fact that the typings were wrong, so probably nobody will complain anyway.

[mcollina]

lgtm

[mcollina]

Let's wait for @Eomm before landing this one.

[Uzlopak]

I agree.