Type annotations not marked as used

[weirdpattern]

Type annotations are not marked as used by typescript/no-unused-vars, so eslint:recommended/no-unused-vars marks this as an error.

// type literal declared elsewhere
import { Nullable } from '../types';

const str: Nullable<string> = 'hello';
console.log(str);

I know there is still a lot of work to do before we can say this rule is working as expected, but I think adding this won't hurt... current work is being tracked in the typescript-eslint-parser repo.