Does the class effectively implement the interface even if the method of a member variable has undefined arguments?

Let's take a closer look at my code, which lacks proper descriptions.

Here is the interface:

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

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

I know this is incorrect, but I'm not sure why:


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

If I add type, I can get suggestions:


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

However, I find the latter approach a bit too verbose.

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