TypeError: Invalid argument provided in `Service` constructor. Expected class annotated with @Service.

Hello, I’m getting this error: TypeError: Invalid argument provided in DatabaseService's constructor. Expected class annotated with @Service.

I usually get this error when I have two services that have dependencies on each other, I mean service A is injected into service B and viceversa.

Right now I have this error because I import Logger Service from index.js and not from logger.service.ts

With this I get the error shown above:

Changing the import I don’t get the error:

As I said before, this error happens to me very often when service A has service B as a dependency and vice versa.

By the way, my logger.service.ts:

import {FastifyInstance} from 'fastify';
import {
  Service,
  getInstanceByToken,
  FastifyInstanceToken,
} from 'fastify-decorators';

@Service('LoggerServiceToken')
export class LoggerService {
  private readonly fastify =
    getInstanceByToken<FastifyInstance>(FastifyInstanceToken);

  info(msg: string, ...args: unknown[]) {
    this.fastify.log.info(msg, ...args);
  }

  error(msg: string, ...args: unknown[]) {
    this.fastify.log.error(msg, ...args);
  }

  debug(msg: string, ...args: unknown[]) {
    this.fastify.log.debug(msg, ...args);
  }

  warn(msg: string, ...args: unknown[]) {
    this.fastify.log.warn(msg, ...args);
  }

  trace(msg: string, ...args: unknown[]) {
    this.fastify.log.trace(msg, ...args);
  }

  fatal(msg: string, ...args: unknown[]) {
    this.fastify.log.fatal(msg, ...args);
  }
}

[L2jLiga]

Hi @akbarsahata, with BaseWorker I think issue can be constructor parameters, dependency injection expects constructable however in your constructor I see configuration, I would suggest trying following approach (without using constructor):

class BaseWorker<T> {
  protected workerName = '';
  protected concurrency = 1;
}

class CoopUpdateWorker extends BaseWorker<Coop> {
  protected workerName = QUEUE_COOP_UPDATED;
}

[akbarsahata]

Hi @akbarsahata, with BaseWorker I think issue can be constructor parameters, dependency injection expects constructable however in your constructor I see configuration, I would suggest trying following approach (without using constructor):

class BaseWorker<T> {
  protected workerName = '';
  protected concurrency = 1;
}

class CoopUpdateWorker extends BaseWorker<Coop> {
  protected workerName = QUEUE_COOP_UPDATED;
}

cool, I happened to use constructor such way on some places and have it fixed. thanks @L2jLiga 🙏🏻