Add request.user property only to routes with fastify.authenticate hook applied in Typescript

[tjapa]

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Issue

Hello.

I'm using the fastify with typescript.

I created this plugin:

export interface AuthPluginOptions {
  jwtAuthSecret: string
}

export default fp<AuthPluginOptions>(
  async (fastify, opts) => {
    fastify.register(fastifyJwt, {
      secret: opts.jwtAuthSecret,
    })

    fastify.decorate(
      'authenticate',
      async function authenticate(
        request: FastifyRequest,
        reply: FastifyReply,
      ) {
        try {
          await request.jwtVerify()
          // console.log(request.user)
        } catch (err) {
          reply.send(err)
        }
      },
    )
  },
  { dependencies: ['application-config'] },
)

declare module 'fastify' {
  export interface FastifyInstance {
    authenticate(request: any, reply: any): void
  }
  interface FastifyInstance
    extends FastifyJwtNamespace<{ namespace: 'security' }> {}
  interface FastifyRequest
    extends FastifyJwtNamespace<{ namespace: 'security' }> {}
}

The problem is that now the request.user option appears for all routes, even those that do not use the authenticate plugin in the onRequest hook.
Is there a way to make the user property only appear for hooked routes?

[mcollina]

Unfortunately no, we are planning to make it possible in v5.

fastify/fastify#5061