An abstract package to be implemented by packages/people who create widgets (or other dingetjes) for Pluto. If you are just happy using Pluto to make cool stuff, you probably don't want to use this package directly. This package is not necessary to create widgets in Pluto, but it can add more advanced functionality to your widgets.
AbstractPlutoDingetjes is a tiny package that only contains a couple of fallback functions. It does not add a noticable increase in loading time to your package:
julia> @time import AbstractPlutoDingetjes
0.003355 seconds (4.50 k allocations: 384.180 KiB)