export function outletHelper(vm: VM, args: Arguments) {
  let scope = vm.dynamicScope() as DynamicScope;
  let nameRef: Reference<string>;
  if (args.positional.length === 0) {
    nameRef = new ConstReference('main');
  } else {
    nameRef = args.positional.at<VersionedPathReference<string>>(0);
  }
  return new OutletComponentReference(new OutletReference(scope.outletState, nameRef));
}

function outletComponentFor(vm: VM, args: Arguments) {
  let { outletState } = vm.dynamicScope() as DynamicScope;

  let outletNameRef;
  if (args.positional.length === 0) {
    outletNameRef = new ConstReference('main');
  } else {
    outletNameRef = args.positional.at(0);
  }

  return new OutletComponentReference(outletNameRef, outletState);
}

 static create(helperClass: any, vm: VM, args: CapturedArguments) {
   let instance = helperClass.create();
   vm.newDestroyable(instance);
   return new ClassBasedHelperReference(instance, args);
 }

function tagName(vm: VM) {
  let dynamicScope: DynamicScope = vm.dynamicScope() as DynamicScope;
  // tslint:disable-next-line:no-shadowed-variable
  let { tagName } = dynamicScope.view!;
  return PrimitiveReference.create(tagName === '' ? null : tagName || 'div');
}

function ariaRole(vm: VM) {
  return vm.getSelf().get('ariaRole');
}