将 mixin 输入类约束到接口时出错

Question

我正在尝试制作一个 mixin 来给某些类一个接口约束，以便我知道输入类具有某些属性。

这是我目前拥有的。

  name: string;
  description: () => string;
}

function mixin<TBase extends Interface>(base: new(...args: any[]) => TBase) {
  return class Mixin extends base {
    get summary() {
      return `${this.name} ${this.description()}`;
    }
  }
}

我得到的错误是函数内部的 Mixin 类，错误是

  'Mixin' is assignable to the constraint of type 'TBase', but 'TBase' could be instantiated with a different subtype of constraint 'Interface'.ts(2415)

如何解决此错误？

Answer 1

你可以试试

interface Interface{
   name: string;
  description: () => string;
}
type GConstructor<T extends Interface> = new (...args: any[]) => T;

function mixin<TBase extends GConstructor<Interface>>(base: TBase) {
  return class Mixin extends base {
    get summary() {
      return `${this.name} ${this.description()}`;
    }
  }
}