Type AbstractControl is not assignable to type FormGroup

[ghost]

I am using PyCharm and "tslint": "^5.11.0". tslint complains about the following.

Building a form using FormBuilder:

this.menuForm = this._formBuilder.group({
      form: this._formBuilder.group(this.menu.form)
    });

and later assigning this to

const form: FormGroup = this.menuForm.get('form');

will give

Type AbstractControl is not assignable to type FormGroup

despite

export declare class FormGroup extends AbstractControl

Is that my fault or is tslint doing something wrong?

[ghost]

Ok nvm - You have to upcast: const form = <FormGroup> this.menuForm.get('form');