Hiya! Thanks for all the hard work on this project; I really appreciate how easy it's been to add Typescript linting to my existing ESLint config in a mixed language repo.

I upgraded a project from 1.3.0 to 1.4.1 and noticed a new error in a namespace that doesn't look right to me. I'm relatively new to Typescript (so please forgive me if I'm missing something basic here), but here's what I've got:

Repro

https://gist.github.com/mcous/3c80c5b0b901edb971014cd05a97a987

module.exports = {
  root: true,
  extends: ['plugin:@typescript-eslint/recommended'],
  rules: {
    '@typescript-eslint/no-unused-vars': 'error',
  },
}

// types.d.ts
declare namespace Foo {
    function foo(foo: string): void // 'foo' is defined but never used.
}

Expected Result

No errors

Actual Result

error  'foo' is defined but never used  @typescript-eslint/no-unused-vars

Additional Info

• @typescript-eslint/eslint-plugin@1.3.0 - no errors
• @typescript-eslint/eslint-plugin@1.4.0 - error
• @typescript-eslint/eslint-plugin@1.4.1 - error

Versions