[英]Typescript generics: How to define properties
I'm struggling a bit with generics in typescript and just encountered the following 我在打字稿中使用泛型有点挣扎,只是遇到了以下问题
save<T>(data: T): Observable<T> {
const created = data.createdTime;
...
}
The problem here is that typescript tells me that createdTime
is an unknown property. 这里的问题是打字稿告诉我
createdTime
是未知属性。 However, in my case, any data
object passed to save
will have a createdTime
property. 但是,就我而言,传递给
save
任何data
对象都将具有createdTime
属性。 What is the correct way to tell typescript that data
has this property ? 告诉打字稿
data
具有此属性的正确方法是什么?
Make T
extend an interface 使
T
扩展接口
interface Data {
createdTime: number
}
save<T extends Data>(data: T): Observable<T> {
const created = data.createdTime;
...
}
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