[question] - Is it possible to have Annotations with Parameters?

[dinbtechit]

Is it possible to have Annotations with Parameters? This is something we could do in dart:mirrors.

Annotation Definition:

class Injectable extends Reflectable {
  final String name;
  const Injectable({this.name = ''}) : super(newInstanceCapability, declarationsCapability, invokingCapability);
}

usage

@Injectable(name: ServiceA)        // <----<< Annotation with parameters.
class ServiceA {

}

---

$ flutter pub run build_runner build

Error:

A reflector class must have exactly one constructor which is `const`, has 
the empty name, takes zero arguments, and uses at most one superinitializer.
Please correct `class Injectable extends Reflectable` to match this.

[eernstg]

No, the "reflector" class must be a direct subclass of class Reflectable from 'package:reflectable/reflectable.dart', and it must have that very specific shape which is mentioned in the error message.

However, you could simply do this:

// Reflector declaration, in 'reflector_lib.dart'.

@GlobalQuantifyMetaCapability(Injectable, Reflector())
import 'package:reflectable/reflectable.dart';

class Reflector extends Reflectable {
  const Reflector()
      : super(
            newInstanceCapability, declarationsCapability, invokingCapability);
}

class Injectable {...} // Whatever is needed.

// Usage, in some other library.
import 'reflector_lib.dart';

@Injectable(name: ServiceA)
class ServiceA {...}

I'll close the issue because I think this will address your concern. Please create a new one if needed!

[dinbtechit]

That worked thank you!