How to subscribe to filter value changes in a directive?

Question

Angular

From the main controller to smaller filters that divide the directives among themselves, not through watch, but in a more beautiful way

Answer 1

1) directives can communicate through controllers (read about the require attribute of a directive)
2) handlers can be specified through attributes:

{
    scope: {
         onChange: '&'
    },
    link: function (scope, el, attr, ctrl) {
         ctrl.onChange(function (filter) {
             scope.onChange({filter: filter});
         });
    }
}