TypeScript：类型定义的参考子类型（接口）

问题描述：

我在我的TypScript中使用以下类型：

I am using the following type in my TypScript:

interface ExerciseData {
    id : number;
    name : string;
    vocabulary : {
        from : string;
        to : string;
    }[];
}

现在我想创建一个类型相同的变量属性词汇，尝试以下操作：

Now I'd like to create a variable that is of the same type as the attribute vocabulary, trying the following:

var vocabs : ExerciseData.vocabulary[];

但这不起作用。是否有可能以某种方式引用子类型？或者我必须做这样的事情？

But that is not working. Is it possible to reference to a subtype somehow? Or would I have to do something like this?

interface ExerciseData {
    id : number;
    name : string;
    vocabulary : Vocabulary[];
}

interface Vocabulary {
        from : string;
        to : string;
}

var vocabs : Vocabulary[];

非常感谢提示。

答

不完全是你想要的，但你可以使用typof关键字解决这个问题，但前提是你有一个声明为你的接口类型的var，如下所示。请注意，我认为您在上一个代码块中所做的事情要好得多：）

Not exactly what you want but you can hack around this with the typof keyword but only if you have a var that is declared as your interface type like below. Note that I think what you did in your last codeblock is a lot better :)

interface ExerciseData {
    id : number;
    name : string;
    vocabulary : {
        from : string;
        to : string;
    }[];
}
var x: ExerciseData;
var vocabs : typeof x.vocabulary[];

TypeScript：类型定义的参考子类型（接口）

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