[英]How to extend class type with decorator
I'd like to use decorators in my project.我想在我的项目中使用装饰器。 Here's what I have written:
这是我写的:
export const DetachedWindow = (options: TDetachedWindowOptions = defaultOptions) => <R extends Constructable>(Clazz: R): R => {
const tmp = class extends Clazz {
value = 'value';
value2 = 'value2';
constructor(...args: any[]) {
super(...args);
// <some logick>
}
};
Object.defineProperty(tmp, 'name', { value: Clazz.name });
return tmp;
};
As you see this decorators creates a few fields.如您所见,这个装饰器创建了一些字段。 But typescript can't recognize them
但是typescript无法识别
@DetachedWindow({ optA: 'optA' })
export class SomeClass {
constructor() {
setTimeout(() => {
console.log(this.value); // TS2339: Property 'value' does not exist on type 'SomeClass'.
});
}
}
It does exsist though.它确实存在。 If I add
@ts-ignore
before using these parameters, the code works okay.如果我在使用这些参数之前添加
@ts-ignore
,代码就可以正常工作。
I wounder, how can I create a class decorator, that would extend parent's type.我 wounder,我怎样才能创建一个 class 装饰器,它会扩展父级的类型。 I tried to do something like this:
我试图做这样的事情:
export const DetachedWindow = (options: TDetachedWindowOptions = defaultOptions) => <R extends Constructable>(Clazz: R): R & { value: string } => {
But it didn't help.但这没有帮助。
Any ideas?有任何想法吗?
The answer is in the TypeScript docs of the Class decorators :答案在Class 装饰器的 TypeScript 文档中:
// Note that the decorator _does not_ change the TypeScript type
// and so the new property `reportingURL` is not known
// to the type system:
bug.reportingURL;
Property 'reportingURL' does not exist on type 'BugReport'.
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