Why is version 12 ignoring *.d.ts files?

https://github.com/nuxt/eslint-config/blob/3bc1fb3cfa2f01b807477b18c3b1c9c6e8eef8ed/packages/eslint-config-legacy/index.js#L159

I want my type definition files to be linted too.

If the intention was to ignore auto-generated ones then probably this should be done for specific directories.