AppFeature.swift

import Foundation
import ComposableArchitecture

public struct AppFeature: ReducerProtocol {
    public struct State: Equatable {
        var path = StackState<Path.State>()
        var articlesList = ArticleListReducer.State()
    }

    public enum Action: Equatable {
        case path(StackAction<Path.State, Path.Action>)
        case articlesList(ArticleListReducer.Action)
    }

    public init() {}


    public var body: some ReducerProtocolOf<Self>  {
        Scope(state: \.articlesList, action: /Action.articlesList) {
          ArticleListReducer()
        }

        Reduce<State, Action> { state, action in
            switch action {
            case .path:
                return .none
            case .articlesList:
                return .none
            }
        }
        .forEach(\.path, action: /Action.path) {
          Path()
        }
    }


    public struct Path: ReducerProtocol {
        public enum State: Equatable {
            case detail(ArticleDetail.State)
        }

        public enum Action: Equatable {
            case detail(ArticleDetail.Action)
        }

        public init() {}

        public var body: some ReducerProtocolOf<Self> {
            Scope(state: /State.detail, action: /Action.detail) {
              ArticleDetail()
            }
        }
    }
}

import SwiftUI

public struct AppFeatureView: View {
    let store: StoreOf<AppFeature>

    public init(store: StoreOf<AppFeature>) {
        self.store = store
    }

    public var body: some View {
        NavigationStackStore(
            self.store.scope(
                state: \.path,
                action: { .path($0) }
            )
        ) {
            ArticleListView(
                store: self.store.scope(state: \.articlesList, action: { .articlesList($0) })
            )
        } destination: { state in
            switch state {
            case .detail:
                CaseLet(
                    state: /AppFeature.Path.State.detail,
                    action: AppFeature.Path.Action.detail,
                    then: ArticleRowView.init(store:)
                )
            }
        }
    }
}