[英]Annotate a class using declaration file? — TypeScript
I have a decorator which adds a property into the class as:我有一个装饰器,它将一个属性添加到 class 中,如下所示:
function Service(constructor: any): any {
constructor.Instance = {};
}
@Service
class MyService {
}
The property will be static
as public static Instance: MyService
, but i have a bunch of classes, i just can't add public static Instance: ServiceType
, in every class. The property will be static
as public static Instance: MyService
, but i have a bunch of classes, i just can't add public static Instance: ServiceType
, in every class. What I did is:我所做的是:
class BaseService<T> {
public static Instance: T; // Static members cannot reference class type parameters.ts(2302)
}
@Service
class MyService extends BaseService<MyService> {
}
Which should work but I got Static members cannot reference class type parameters.ts(2302)
, so i tried this as:哪个应该可以,但我得到了Static members cannot reference class type parameters.ts(2302)
,所以我试了这个:
function BaseService<T>() {
abstract class BaseService {
public static Instance: T;
}
return BaseService;
}
@Service
class MyService extends BaseService<MyService> { // Type '<T>() => typeof BaseService' is not a constructor function type.ts(2507)
}
this also not worked, so i think can we make a declaration file, in which we can declare BaseService
class as a type, but I am confused how to use that type?这也不起作用,所以我想我们可以制作一个声明文件,在其中我们可以将BaseService
class 声明为一种类型,但我很困惑如何使用该类型? implements? extends?
, but Type can't be extended or implemented. ,但 Type 无法扩展或实现。 As the Instance
already exists in the class, what i need exactly is to annotate the class with that property, so that i can access it like MyService.Instance
, and i don't want to add explicitly in all classes.由于Instance
已经存在于 class 中,我需要的是用该属性注释 class ,以便我可以像MyService.Instance
一样访问它,我不想在所有类中显式添加。 Any suggestions?有什么建议么?
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