Regarding initial search string as `null` about inquirer-autocomplete-prompt

[mokkabonna]

Null was chosen over '' so that you could determine if the user has typed something, then removed it (resulting in '' ) or if it was the first "search".

I agree that undefined is better.

[ycmjason]

Even passing undefined is better so that I could use default parameters for searchString. Now I have to do the old school searchString = searchString || '' in order to set it to ''.

[mokkabonna]

Open a PR if you like, will close #52 as well

Is it possible to pass in an array/list as default instead of initial null/undefined. Maybe it could be picked up from default or choices key from inquirer.

[ycmjason]

The idea of using undefined is that we could use function default args to set whatever default you want.