Detect a future parallel backend

[talegari]

As a package developer, I need to know if user is using a parallel backend or not. Is there a better way than parallel_flag = !("sequential" %in% class(future::plan())) ?

[scottkosty]

You can see here for one approach.

By the way, I'm curious about your specific use case. Why, as a package developer, do you need to know if the user is using a parallel backend or not?