set_state 4.0.0

A subclass of the State object placed in a static collection.

set_state

A subclass of the State object collecting all your app's State objects for safe and ready access.

Installing

I don't always like the version number suggested on the Installing page.
In most cases, Always go up to the 'major' semantic version number when installing library packages. In your pubspec.yaml file, I suggest always go up to the 'major' semantic version number with trailing with two zero, '.0.0':

dependencies:
 set_state: ^ 4.0.0

Although this package is now deprecated, documentation is still available in the following medium article:

However, the package, state_set, is now recommended. It too has extensive documentation in the following medium article, A Mixin For State Objects: