I'am using typedi in a Node (express) project. I can't understand why, in my service class, the injection works fine as property injection but not as constructor injection.

This works:

@Service()
export default class AuthService {
  @Inject("logger") private logger
  @Inject("eventEmitter")
  private eventEmitter!: EventEmitter;
   
  constructor(

  ) {}
}

While this is not working:

@Service()
export default class AuthService {
  @Inject("logger") private logger
  @Inject("eventEmitter")
  private eventEmitter!: EventEmitter;
   
  constructor(
      @Inject("logger") private logger,
      @Inject("eventEmitter") private eventEmitter: EventEmitter
  ) {}
}

As an example, I use the logger and the emitter as follows:

  public async SignUp(
    userInputDTO: IUserInputDTO
  ): Promise<{ user: IUser; token: string }> {
    try {
      //some code
      this.logger.silly("Hashing password");
      const hashedPassword = await argon2.hash(userInputDTO.password, { salt });
      this.logger.silly("Creating user db record");
      this.eventEmitter.emit(userEvent.signUp);
      //some code

      return {
        user: { },
        token: "myToken",
      };
    } catch (e) {
      this.logger.error(e);
      throw e;
    }
  }

In the first case it works as expected , but in the second case, this.eventEmitter and this.logger are undefined.

As a side note:

• there aren't circular dependencies
• I imported 'reflect-metadata', in fact the decorators work fine if they are placed on properties and not in the constructor's parameters
• typedi, unless for this problem works fine. I can use Container#get , Container#set without any problem