TODO-App-DI.swift

protocol BaseContext {
    var cloudKitApiKey: String {get}
    var todosDataSource: TodosDataSource {get}
}
class AppContext: BaseContext {
    var cloudKitApiKey = "sjsfAJ&76sdgjhs3434JHS3"
    var todosDataSource: TodosDataSource = TodosCloudKitDataSource()
}

class TodosListContext: AppContext {
    let view: TodosListView
    init(view: TodosListView) { self.view = view }
}

func deleteAllTodosFromDataSource() -> AsyncResult<TodosListContext, Event, GenericError> {
    return AsyncResult<TodosListContext, Event, GenericError>.ask.flatMap { context in
        context.todosDataSource.deleteAllTodos()
    }
}