使用构造函数扩展泛型

Question

如何在 Typescript 中使用构造函数扩展泛型类型？

function doSomething<T extends ?constructor?>(constructor: T) {
    ...
}

Answer 1

你可以这样做：

type Constructor = new (...args: any[]) => any;

class Base {
  baseProp = 'base value';
}

function doSomething<T extends Constructor>(constructor: T) {
    return class extends constructor {
      factoryProp = 'factory prop';
    }
}

const DerivedClass = doSomething(Base);

const instance = new DerivedClass;

console.log(instance.baseProp);
console.log(instance.factoryProp);

TypeScript playground

使用构造函数扩展泛型

Extending a generic type with a constructor function

javascript

generics

typescript