TypeScript装饰程序,获取值的类型
这是我的密码TypeScript装饰程序,获取值的类型,typescript,knockout.js,Typescript,Knockout.js,这是我的密码 function observableDecorator<T>(target: T, key: keyof T) { let observable = ko.observable<any>((target[key] as any)); Object.defineProperty(target, key, { get() { this[key]._ko_util_id = random;
function observableDecorator<T>(target: T, key: keyof T) {
let observable = ko.observable<any>((target[key] as any));
Object.defineProperty(target, key, {
get() {
this[key]._ko_util_id = random;
this.obs = observable<
HERE_IS_WERE_THE_TYPE_OF_VALUE_SHOULD_BE
>();
},
set(value) {
observable(value);
}
});
}
在第6行,我需要值的类型。我试图从target[key]获取类型,但它未定义。我一定会喜欢并标出正确的答案。我不确定这是否是你想要的,但它似乎可以满足你的需要
function observableDecorator<
T extends Record<string, any>,
K extends keyof T,
V = T extends Record<string, infer X> ? X : never
>(target: T, key: K) {
const observable = ko.observable<V>(target[key]);
Object.defineProperty(target, key, {
get() {
this[key]._ko_util_id = random;
this.obs = observable<V>(); // or typeof random?
},
set(value: V) {
observable(value);
}
});
}
你为什么要在getter中设置一些东西?