router_gen/lib/generator/router_generator.dart

import 'package:analyzer/dart/element/element.dart';
import 'package:build/build.dart';
import 'package:router_gen/annotation/router_page.dart';
import 'package:source_gen/source_gen.dart';

class RouterGenerator extends GeneratorForAnnotation<RouterPage> {
  @override
  generateForAnnotatedElement(Element element, ConstantReader annotation, BuildStep buildStep) {
    print(element);

  }
}