Fastify middleware doesn't apply correctly when matched against routes registered via a Fastify plugin.

[DennisSnijder]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

I'm currently working on a NestJS module which registers a UI and some endpoints via a Fastify plugin using a prefix.

 this.adapterHost.httpAdapter
        .getInstance()
        .register(this.registerPlugin(), {prefix: '/my-prefix'});

When registering a middleware for the routes matching the prefix, the middleware won't trigger.

configure(consumer: MiddlewareConsumer): any {
    consumer
      .apply(MyMiddleware)
      .forRoutes('/my-prefix', 'my-prefix', '/my-prefix/*')
 }

Minimum reproduction code

https://github.com/DennisSnijder/nestjs-bull-board-example

Steps to reproduce

1. yarn install
2. docker-compose up -d
3. yarn start:dev
4. visit: http://localhost:3000/queues

Expected behavior

When the configured routes for the endpoint is being reached, it should trigger the middleware provided.

Package

• I don't know. Or some 3rd-party package
• @nestjs/common
• @nestjs/core
• @nestjs/microservices
• @nestjs/platform-express
• @nestjs/platform-fastify
• @nestjs/platform-socket.io
• @nestjs/platform-ws
• @nestjs/testing
• @nestjs/websockets
• Other (see below)

Other package

No response

NestJS version

10.0.0

Packages versions

[System Information]
OS Version : macOS Unknown
NodeJS Version : v16.20.0
YARN Version : 1.22.19

[Nest CLI]
Nest CLI Version : 10.0.1

[Nest Platform Information]
platform-express version : 10.0.0
platform-fastify version : 10.0.0
schematics version : 10.0.1
testing version : 10.0.0
bullmq version : 1.1.0
common version : 10.0.0
core version : 10.0.0
cli version : 10.0.1

Node.js version

16.20

In which operating systems have you tested?

• macOS
• Windows
• Linux

Other

In the AppModule the middleware is being registered with the desired routes (in this example /queues).
The Fastify plugin is registered through the "BullBoardModule" see: https://github.com/felixmosh/bull-board/blob/master/packages/nestjs/src/bull-board.root-module.ts#L30

Interesting thing to notice: when reaching to an not existing url, the middleware does register (I guess it falls back to the NestJS route handler?) for example https://localhost:3000/queues/non-exisiting-route

[DennisSnijder]

Might be related to #11572 ?

[mareksuscak]

@kamilmysliwiec is there any official recommendation as to how to get middleware to run before the routes registered with a plugin?