[BUG] A new derived API causes Typescript error

After upgrading to overmind@24.0.0 I see the following Typescript error:

TS2345: Argument of type ‘(state: State) => string’ is not assignable to parameter of type ‘(state: IState, rootState: IState) => any’.   Types of parameters ‘state’ and ‘state’ are incompatible.     Type ‘IState’ is missing the following properties from type ‘State’: defaultLocaleCode, list

• Typescript version: 3.9.5
• Overmind version: 24.0.0

1. I use explicit typing:

declare module 'overmind' {
  interface Config
    extends IConfig<{
      state: typeof state;
      actions: typeof actions;
      effects: typeof effects;
    }> {}
}

1. Code to reproduce the error:

import { derived } from 'overmind';
import { Locale } from 'core/typings';

export type State = {
  defaultLocaleCode: string;
  list: Locale[];
};

export const state: State = {
  defaultLocaleCode: derived((state: State) => { // <------- here typescript complains
    return state.list.find((locale) => locale.default === true)?.code ?? 'en-US';
  }),
  list: [],
};

[suevalov]

@christianalfoni just check it out and it fixes the issue 🎉

huge thanks as usual 💯

[christianalfoni]

Okay, so pushed a fix to next where this typing is fixed.

If you want to use it, make sure you install all overmind packages with the @next tag.

When this one is ready, it is available: https://travis-ci.org/github/cerebral/overmind/builds/696549177