Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.17.0

Plugin version

No response

Node.js version

Irrelevant

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

Irrelevant

Description

The type of genReqId server option implies its only argument is an instance of FastifyRequest:

    genReqId?: <...>(req: FastifyRequest<...>) => string,

However, in practice it is given RawRequest (e.g. http.IncomingMessage):

function routeHandler (req, res, params, context, query) {
    const id = genReqId(req)

while FastifyRequest is created only later in this function.

Steps to Reproduce

To reproduce, let's extend the test in test/genReqId.js:

    genReqId: function (req) {
      t.hasProp(req, 'id')
      t.hasProp(req, 'raw')
      return 'a'
    }

This test will now fail, because these two props normally found in FastifyRequest instance do not actually exist. (Well, id value is supposed to be provided by genReqId in the first place)

Expected Behavior

The type definition should be something like this:

genReqId?: <...>(req: RawRequest) => string,