Expose TS types from the main export

Feature Request

Hello 👋,

Since an update from v2 to v3, the type, the following does not work anymore:

import * as mmd from 'music-metadata';

const test: mmd.IAudioMetadata = { ... }; // IAudioMetadata is not defined...

I managed to fix it by importing it with import { IAudioMetadata } from 'music-metadata/lib/type'; , but it kind of triggers my OCD 😄

Could we imagine putting the types back (or at least exporting them) to index.d.ts?

[Borewit]

IPicture added in v3.5.3

[martpie]

🎉