• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

{
  "rules": {
    "@typescript-eslint/no-unused-vars": "error"
  }
}

interface.d.ts

// good
interface IPerson {
  name: string;
  age: number;
}
// got warning
interface IItem {
  title: string;
  url: string;
  children?: IItem[];
}

Expected Result

No warning on interface IItem

Actual Result
Got warning: 'IItem' is defined but never used

Additional Info

Versions