• 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

{
  "parser": "@typescript-eslint/parser",
  "plugins": ["@typescript-eslint"],
  "rules": {
    "@typescript-eslint/no-unused-vars": "error"
  }
}

// foo.d.ts
export namespace Foo {
  const bar: string;
  namespace Baz {
    const quux: string;
  }
}

Expected Result

No error. In a .d.ts file, members of an exported namespace are implicitly exported, unless the namespace contains an explicit braced export {} declaration.

Actual Result

/tmp/test/foo.d.ts
  2:9   error  'bar' is defined but never used   @typescript-eslint/no-unused-vars
  3:13  error  'Baz' is defined but never used   @typescript-eslint/no-unused-vars
  4:11  error  'quux' is defined but never used  @typescript-eslint/no-unused-vars

✖ 3 problems (3 errors, 0 warnings)

Additional Info

Similar to #2456, which was about a different kind of implicit export in .d.ts files, namely interface declarations.

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