是否有方法使用下面描述的方法获得正确的类型。我试过了
使makeInstance()成为泛型,但我尚未获得扩展类型。代码如下。

class Base {
  name = 'foo';

  static makeInstance() {
    return new this();
  }
}
class Extended extends Base {
  age = 10;
}

let base = Base.makeInstance() // is Base
let extended = Extended.makeInstance(); //should be Extended

console.log(base.name);//ok
console.log(extended.age); //output ok; age doesn't exists
console.log(extended.name);// ok

最佳答案

可以向静态方法添加泛型参数,以推断正确调用该方法的类:

class Base {
    name = 'foo';

    static makeInstance<T>(this: new () => T) {
        return new this();
    }
}
class Extended extends Base {
    age = 10;
}

let base = Base.makeInstance() // is Base
let extended = Extended.makeInstance(); //is Extended

console.log(base.name);//ok
console.log(extended.age); //ok
console.log(extended.name);// ok

关于typescript - 使用静态方法的 typescript 继承,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/51899566/

10-10 18:56