How can I get the metadata of a top-level function in Dart

Question

import 'dart:mirrors';
const Tag = 'tag';
@Tag
void func() => print("hello");
class A {
  @Tag
  void func() => print("hello");
}
main() {
  // top-level func
  print(reflect(func).type.metadata);
  //method
  print(reflectClass(A).declarations[Symbol('func')].metadata.first.reflectee);
}
// output
//[]
//tag

The metadata of the top-level function is empty. But the method in the Class can access its metadata. Is there any way to get the metadata of the top-level function?

Answer 1

import 'dart:mirrors';

const Tag = 'tag';
@Tag
void func() => print("hello");

class A {
  @Tag
  void func() => print("hello");
}

main() {
  var mirrors = currentMirrorSystem();
  // top-level func
  var f = mirrors.isolate.rootLibrary.declarations[#func];
  print(f.metadata.first.reflectee);
  //method
  print(reflectClass(A).declarations[Symbol('func')].metadata.first.reflectee);
  // Closure on `func` has no metadate
  print(reflect(func).type.metadata);  
}

Result

tag
tag
[]