How to use Observation to actually observe changes to a property

[tera]

@pgorzelany

let sourceOfTruth = SourceOfTruth()
let observation = withContinousObservation(of: sourceOfTruth.data) { data in
   // do something when data changes
}

This is almost what you want:

func withContinousObservation<T>(of value: @escaping @autoclosure () -> T, execute: @escaping (T) -> Void) {
    withObservationTracking {
        execute(value())
    } onChange: {
        DispatchQueue.main.async {
            withContinousObservation(of: value(), execute: execute)
        }
    }
}

Ability of cancelling is missing in this implementation.