Typescript如何声明子类类型？ [英] Typescript How to declare a subclass type?

问题描述

是否有可能有这样的东西？

Is it possible to have something like this?

export abstract class FilterBoxElement {
    abstract getEntities: any;
}
export interface FilterBoxControlSuggestions extends FilterBoxElement {
    getEntities: // some implementation with different parameters
}
export interface FilterBoxControlDropDown extends FilterBoxElement {
    getEntities: // some implementation with different parameters
}

export interface FilterBoxDataProps {
    controlElement: FilterBoxElement // FilterBoxControlSuggestions or FilterBoxControlDropDown 
}

我希望 controlElement 必须是 FilterBoxControlSuggestions 或 FilterBoxControlDropDown 。但是现在我可以把所有东西放进去。有没有办法实现这个目标？

I want that controlElement has to be a FilterBoxControlSuggestions or a FilterBoxControlDropDown. But right now I can put everything in it. Is there a way to achieve this?

推荐答案

您可以使用联合类型：

export interface FilterBoxDataProps {
    controlElement: FilterBoxControlSuggestions | FilterBoxControlDropDown 
}

或者如果你想要全部使用泛型FilterBoxElement的子类：

Or with generics if you want all subclasses of FilterBoxElement:

export interface FilterBoxDataProps<T extends FilterBoxElement> {
    controlElement: T
}

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