Как указать массив классов в typescript?

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class User {
  name: string;
  age: number;
}

class Article {
  title: string;
  body: string;
}

const classes = [User, Article];

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function createInstance<T>(c: new () => T): T {
  return new c();
}

const userInstance = createInstance(classes[0]);
const articleInstance = createInstance(classes[1]);