typescript 打字稿扩展不需要的接口
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typescript extend an interface as not required
提问by engincancan
I have two interfaces;
我有两个接口；
interface ISuccessResponse {
Success: boolean;
Message: string;
}
and
和
interface IAppVersion extends ISuccessResponse {
OSVersionStatus: number;
LatestVersion: string;
}
I would like to extend ISuccessResponse interface as Not Required; I can do it as overwrite it but is there an other option?
我想将 ISuccessResponse 接口扩展为不需要；我可以覆盖它，但还有其他选择吗？
interface IAppVersion {
OSVersionStatus: number;
LatestVersion: string;
Success?: boolean;
Message?: string;
}
I don't want to do this.
我不想这样做。
回答by Brad
A bit late, but Typescript 2.1 introduced the Partial<T>type which would allow what you're asking for:
有点晚了，但是 Typescript 2.1 引入了Partial<T>允许您要求的类型：
interface ISuccessResponse {
Success: boolean;
Message: string;
}
interface IAppVersion extends Partial<ISuccessResponse> {
OSVersionStatus: number;
LatestVersion: string;
}
declare const version: IAppVersion;
version.Message // Type is string | undefined
回答by Fenton
If you want Successand Messageto be optional, you can do that:
如果你想要Success并且Message是可选的，你可以这样做：
interface IAppVersion {
OSVersionStatus: number;
LatestVersion: string;
Success?: boolean;
Message?: string;
}
You can'tuse the extendskeyword to bring in the ISuccessResponseinterface, but then change the contract defined in that interface (that interface says that they are required).
您不能使用extends关键字引入ISuccessResponse接口，然后更改该接口中定义的协定（该接口表示它们是必需的）。
回答by Chris Edwards
As of TypeScript 3.5, you could use Omit:
从 TypeScript 3.5 开始，您可以使用Omit：
interface IAppVersion extends Omit<ISuccessResponse, 'Success' | 'Message'> {
OSVersionStatus: number;
LatestVersion: string;
Success?: boolean;
Message?: string;
}
回答by blorkfish
Your base interface can define properties as optional:
您的基本接口可以将属性定义为可选：
interface ISuccessResponse {
Success?: boolean;
Message?: string;
}
interface IAppVersion extends ISuccessResponse {
OSVersionStatus: number;
LatestVersion: string;
}
class MyTestClass implements IAppVersion {
LatestVersion: string;
OSVersionStatus: number;
}
