打字稿根据对象动态创建类型

Question

可以通过简单地分析对象属性（例如像这样的对象）来动态生成类型注释：

cons myObj = {
        start() { /*...*/ },
}

我要生成/返回以下类型：

type Props = {
  start: () => void;
  isScreenStart: () => boolean;
  isStartAllowed: () => boolean;
}

给出advance之类的属性，它应生成以下类型

advance: () => void;
isScreenAdvance: () => boolean;
isAdvanceAllowed: () => boolean;

Answer 1

latest TS version（4.1）可以实现：

type Generate<T> = {
    [K in keyof T & string as T[K] extends Function ?
    `isScreen${capitalize K}` | `is${capitalize K}Allowed` :
    never]: () => boolean
} & T

type Generated = Generate<typeof myObj> 
// { isScreenStart: () => boolean; isStartAllowed: () => boolean; } & { start(): void; }

您可以查看this sample code。请注意，最终版本的编译器关键字capitalize为subject to change。