类实现接口，但是成员变量方法的参数没有类型？

Question

So let's just look at my code. It's not very well described.

This is interface:

interface IModel<T = any> {
  effects: {
    [key: string]: (getState: () => T) => void;
  };
}

interface IState {
  name: string;
  age: number;
}

This is wrong, but I don't know why:

class Model implements IModel<IState> {
  effects = {
    getName: (getState) => {
      const { /** Here, Ts has no smart tips */ } = getState();
    }
  };
}

Need me to add type, just can have tips:

class Model implements IModel<IState> {
  effects = {
    getName: (getState: () => IState) => { // add type
      const { /** Yes, have 'name' and 'age' */ } = getState();
    }
  };
}

But, I think the latter approach is a bit verbose.

Answer 1

Unfortunately you can't do this. Check https://github.com/Microsoft/TypeScript/issues/1373 for updates.