An example for fastify + fastify decorators and plugins (db connector, and so on)

fastify-decorators-example.ts

// server.ts
import fastify from 'fastify';
import { bootstrap } from 'fastify-decorators';

const app = fastify()

// Note that this plugin adds a decorator to the fastify instance like: fastify.awesomePlugin(...)
app.register(require('some-awesome-plugin'))

app.register(bootstrap, {
  controllers: [...],
});

// app.service.ts
import type { FastifyInstance } from 'fastify'
import { Service, getInstanceByToken, FastifyInstanceToken } from 'fastify-decorators'

@Service()
export class AppService {
  private readonly fastify = getInstanceByToken<FastifyInstance>(FastifyInstanceToken);
    
  async getApp() {
    // Now you can access to fastify instance by:
    this.fastify.awesomePlugin(...)
    
    return {
      ok: true
    }
  }
}