The non-literal defaults aren't recognized correctly

[illright]

Imagine you have a JS file which exports some enum:

export default Object.freeze({
  TOP_LEFT: 'top left',
  TOP_RIGHT: 'top right',
});

You want your prop to be one of the values from that enum, so you write the following in your Svelte component:

<script>
  import ThatEnum from 'path/to/enum';
  /**
   * @type {typeof import('path/to/enum').default}
   */
  export let position = ThatEnum.TOP_LEFT;
</script>

The generated typings lack the information on the default value of this prop:

export interface ComponentProps {
  position?: typeof import("path/to/enum").default;
}

[illright]

Consequently, the same problem occurs with Infinity and undefined as the default values for a prop, as those are global variables.
It is also spotted with components and other Svelte objects (e.g. transitions) as default values.