This issue was originally filed by ak...@gmail.com

Problem repeats on Linux and Windows on Chrome, Chromium, FireFox, IE.

I'm expecting to have ClassMirror of 'type' property in VariableMirror and it does really return it in DartVM:

VariableMirror.type => ClassMirror

so I can instantiate variable with 'newInstance' method of ClassMirror.

In JavaScript VM it does return JsTypeMirror of dynamic type:

TypeMirror get type => JsMirrorSystem._dynamicType;

(from https://code.google.com/p/dart/source/browse/trunk/dart/sdk/lib/_internal/compiler/implementation/lib/js_mirrors.dart?r=23894)

and fails with next exception:

Uncaught TypeError: Object #<JsTypeMirror> has no method 'newInstance$2'

Use example code below to test:

import 'dart:html';
import 'dart:mirrors';

void main() {
  DivElement div = query("#sample_container_id");
  div.text = testMirrors();
}

class A {
  
  B b;
}

class B {
  
  String name = "Unknown";
  
  B();
}

String testMirrors() {
  // Make an instance of class A
  A a = new A();
  // Get instance mirror of class A
  InstanceMirror aIM = reflect(a);
  // Get class mirror of class A
  ClassMirror aCM = aIM.type;
  // Find 'b' variable mirror in class mirror of class A
  VariableMirror bVM = aCM.variables.values.first;
  // Get class mirror of variable mirror of 'b'
  ClassMirror bCM = bVM.type;
  try {
    // Instantiate variable 'b'
    InstanceMirror bIM = bCM.newInstance(const Symbol(""), []);
    // Assign instance of variable 'b' to instance of class A
    aIM.setField(const Symbol("b"), bIM.reflectee);
  } on Exception catch(ex) {
    print(ex);
  }
  // Return 'name' of 'b' of 'a'
  return a.b.name;
}

String symbolAsString(Symbol symbol) => MirrorSystem.getName(symbol);