NestJS JWT Strategy: 'super' must be called before accessing 'this' in the constructor of a derived class

I’m learning to create an authentication system with NestJS using JWT. My system has a CRUD for managing users but it can only be used by authenticated people, so I put this guard:

@Controller('users')
@UseGuards(AuthGuard('jwt'))
export class UsersController {
    \\ implementation
}

I’m trying to create the JWT strategy:

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(private readonly config: ConfigService) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: this.config.get<string>('JWT_SECRET_PASS'),
    });
  }
}

But facing the error:

'super' must be called before accessing 'this' in the constructor of a derived class.

I need to access the ConfigService so I can define my secret which is in an env. How can I do that?

>Solution :

config is passed as a parameter to the constructor, so you can remove the this in this.config and still access config just fine