如何使用带有类型ES6类的Immutable JS？

Question

说我有课Task和TaskGroup

class Task{
     constructor(public text:string){}
}

class TaskGroup {
    constructor(public title:string = "new task group", public tasks:Task[] = []){}
}

然后在我的Angular 2服务中,我将创建一个不可变的TaskGroups列表

@Injectable()
class TaskService {
    taskGroups:Immutable.List<TaskGroup>;

    constructor() {
       this.taskGroups = Immutable.List<TaskGroup>([new TaskGroup("Coding tasks")]);
    }
}

这样只有taskGroups List是不可变的.不管里面是什么都不是.即使我Immutable.fromJS(...)而不是Immutable.List<Board>(...)嵌套对象都是普通的'Javascript对象.

不可变的JS不会假定类继承(使用ES6#562继承自Immutable对象)

//can't do this!
class TaskGroup extends Immutable.Map<string, any>{
    constructor(public title:string = "new task group", public tasks:Task[]){}
}
//it complained about the class not having methods like set, delete etc

那么如何创建Immutable类对象呢？

Answer 1

你可以这样做:

const TodoRecord = Immutable.Record({
    id: 0,
    description: "",
    completed: false
});

class Todo extends TodoRecord {
    id:number;
    description:string;
    completed: boolean;

    constructor(props) {
        super(props);
    }
}

let todo:Todo = new Todo({id: 1, description: "I'm Type Safe!"});

不完美但工作.

它来自这篇伟大的博客文章:https: //blog.angular-university.io/angular-2-application-architecture-building-flux-like-apps-using-redux-and-immutable-js-js/