fix(types): option privacy in Nodenext | Node16

[Gehbt]

Relate commit #116

When use with typescript in compilerOptions: "module": "Node16" | "Nodenext", it will call the namespace fastifyCaching, that caused and should use

I don`t know why those tests-suits fail.

Checklist

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

Reproduction

• Stackblitz

[mcollina]

What is this fixing?

[Gehbt]

What is this fixing?

I added the informations.

[gurgunday]

Can you please add a test?

We use tsd

[Gehbt]

Can you please add a test?

We use tsd

I cannot provide the test, but I can give a minimal reproduction.

[Gehbt]

Do you review the Reproduction? I think I have revealed it: there is using "type": "commonjs", if changed to "type": "module" it will break. May we really ought to wait a guy in NodeNext?

[gurgunday]

Not sure how we could test this... but reproducing is possible

[marcoreni]

any chance of getting this merged?