ObservableState
ObservableState.swift:10protocol ObservableState : Perceptibleprotocol ObservableState : Perceptibleimport ComposableArchitectureThe Composable Architecture (TCA, for short) is a library for building applications in a consistent and understandable way, with composition, testing, and ergonomics in mind. It can be used in SwiftUI, UIKit, and more, and on any Apple platform (iOS, macOS, tvOS, and watchOS).
protocol PerceptibleA type that emits notifications to observers when underlying data changes.
var _$id: ObservableStateID { get }mutating func _$willModify()