TS Path aliases seem to break type output

For example:

Works ✅

import { Theme } from '../themes/Theme'

export interface IconProps {
  /** The color to use */
  color?: keyof Theme['color']
}

Yikes! ❌

import { Theme } from @themes/Theme'

export interface IconProps {
  /** The color to use */
  color?: keyof Theme['color']
}

The bottom results in the following type annotation being output:

string | number | symbol instead of the expected 'primary' | 'secondary' | 'tertiary'

No file or test is named in the issue. Start by reproducing the relative-import and path-alias examples, then trace how the TypeScript type output is resolved; done means the alias example produces the expected 'primary' | 'secondary' | 'tertiary' union instead of string | number | symbol.