Property `inner` missing from `OAuthError` typings

[papermana]

Specify your setup

• Operating System:
• Node version: -
• npm version: -
• version of @node-oauth/oauth2-server: 5.2.1
• which OAuth2 workflow: -
• at which workflow step does the error occur: -

Describe the bug

Documentation says that OAuthError has a property inner. It is set in the code. But TS typings are missing this property.

Looking at the code, there should be inner?: Error.

To Reproduce

Expected behavior

Screenshots

Additional context

[wille]

I think the inner error should be set in the .cause property https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause