`export class AppComponent {
  title = 'app works!';
  t: Test = {
    name: ''
  }
  t: SquareConfig = {
    color: 'white',
    width: 10,
    d: ''
  }
}

interface Test {
  name: string;
  phone?: number;
}

interface SquareConfig {
  color: string;
  width: number;
  [propName: string]: any;
}`