How to use documents?

I am reading
and we have a lookupIn(key [, options]) method

As far as I know , there is no document for options , Where is full documentation?

Hi @socketman2016

The lookupIn function does take an options object as a parameter, however it’s actually used in this case.

Public properties that the SDK wants to expose will be described in the documentation. We try to be consistent with the options object for optional parameters, and there are sometimes internal properties that are not for public usage.

I do agree a note to say there are properties expected to be used in this method would be useful.