chore: export RouteGenericInterface

[ChrisCrewdson]

This is a very small change just to re-export RouteGenericInterface which is needed by typescript 4.8.x for implementations of RouteHandlerMethod
I created an issue for this #4235 that will be solved by this PR.

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]

lgtm

[mcollina]

Could you add a unit test for this?

[ChrisCrewdson]

I am not sure if I can, since this is just about being able to access the type but I can try.

[mcollina]

We use tsd for our types tests.

[ChrisCrewdson]

Since this doesn't actually add a type, just re-exports it, I can't figure out how this fits as a test. The existing type just needs to be exposed.

[mcollina]

import it in https://github.com/fastify/fastify/blob/main/test/types/fastify.test-d.ts#L12 add an expectType.

[ChrisCrewdson]

Hopefully this is what you are looking for. This is the simplest test case since all properties from the interface are optional.

[github-actions]

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