Does not infer request property types from schema

[paulius-valiunas]

Prerequisites

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

Fastify version

4.28.1

Plugin version

3.6.0

Node.js version

20.15.0

Typescript version

5.2.2 (also tested with 5.5.4)

Operating system

Linux

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

archlinux in WSL

Description

I tried following Fastify documentation, but even when copy/pasting their example without any changes, the inferred type of request.query is unknown.

MRE:

const server = fastify().withTypeProvider<TypeBoxTypeProvider>();

server.get("/route", {
  schema: {
    querystring: Type.Object({
      foo: Type.Number(),
      bar: Type.String(),
    }),
  },
}, (request, reply) => {

  // type Query = { foo: number, bar: string }

  const { foo, bar } = request.query;
  // error TS2339: Property 'bar' does not exist on type 'unknown'.
  // error TS2339: Property 'bar' does not exist on type 'unknown'.
});

Link to code that reproduces the bug

No response

Expected Behavior

request.query should be correctly inferred to be of type { foo: string, bar: string }. Same problem with body, response, headers and params types.

[cesxhin]

same problem

[marko1010]

it's Fastify() not fastify()

[paulius-valiunas]

it's Fastify() not fastify()

If you import it as import * as Fastify from "fastify" or import Fastify from "fastify", you're right. If you import it as import * as fastify from "fastify" or import fastify from "fastify", it's fastify(). If you import it as import * as cthulhu from "fastify" or import cthulhu from "fastify", it's cthulhu().