Observable Property Wrapper

This microframework provides a property wrapper called @Observable which is the equivalent of a private subject and a public (or internal) publisher.

Instead of writing this:

private let valueSubject: CurrentValueSubject<String, Never> = .init(“foo")
lazy var value: AnyPublisher<String, Never> = {
    valueSubject.eraseToAnyPublisher()
}()

You can write this:

@Observable
private(set) var value: String = "foo"

From within the declaring scope, you can write to value (since it was declared private(set)). From anywhere the declaring scope is visible, you can access the underlying publisher by $value.

This is similar to @Published except it will not trigger an objectWillChange event on a containing ObservableObject.