Vitest and Decorators of Plugins, not coming down

[Shane]

Prerequisites

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

Fastify version

4.26.1

Plugin version

4.26.1

Node.js version

20.11

Operating system

macOS

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

14.4

Description

Not sure where to put this, so move if needed:

I am using Vitest to do unit testing. One thing I noticed is that Typescript is having a hard time understanding plugin decorators that will be loaded:

This is the best example I can give is that the server shows that MongoDB (satisfy-MongoDB plugin is being used) can not be found. When the code is run, it's okay and doesn't error run out.

The server is being returned as:

let server: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTypeProviderDefault>

Steps to Reproduce

Direct Access to Code: https://github.com/JAMS-Project/node-microservice-itil/blob/43a02cc4a23ce07a4261444f7972bb38815d5c53/__tests__/basic.test.ts#L16

Expected Behavior

No response

[KaKa]

I am closing the issue since it is expected behavior in TypeScript.
TypeScript only knows something that is EXPLICITLY imported through the runnable code.

That means when you are using @fastify/autoload, TypeScript do not knows all information since there is no direct import through the code.

As a workaround, you need to specify the module you use in tsconfig.json. Or import the module one by one.

[Shane]

In case anyone else comes back to this, I changed:

    "include": ["./**/*"]

to

    "include": ["./**/*", "../src/**/*"]

... and that fixed the issue.