title: How do I define a TypeScript interface for an empty array?
body: <p>This interface describes my answers array (IActivityAnswer[]).</p>
  
  <pre><code>export interface IActivityAnswer {
    createdAt: string;
    id: string;
    questionId: string;
    score: number;
    summary: string;
    title: string;
    commentCount?: number;
  }
  </code></pre>
  
  <p>Some users won't have any answers (so they will have an empty array). How do I define a type for empty array. I want to accomplish this without using type any. </p>