I have a flutter app that use the provider package to represent state.
At the start of my app I want to run some operations and set the state of my application accordingly (when the operation are finished)

Here is what I would like to do:

class A extends ChangeNotifier {
  void computute(Data data) {
  ...
  }
...
}

class B  extends ChangeNotifier {
  B(){
    var data = _runOperations();
    _data = data.forB; // set my own state
    var a = Provider.of<A>(context); // not possible
    a.compute(data.forA); // notify another provider that my operations have finish and to change state accordingly
  }
...

}

the issue I have here is that there is no build context so I can’t get access to other ChangeNotifier.

How to run code at the start of my flutter app and notify ChangeNotifier accordingly when the operation is finish?