import { StoreApi, UseBoundStore } from 'zustand';

type State = object;

type WithSelectors<S> = S extends { getState: () => infer T }
  ? S & { use: { [K in keyof T]: () => T[K] } }
  : never;

const createSelectors = <S extends UseBoundStore<StoreApi<State>>>(_store: S) => {
  let store = _store as WithSelectors<typeof _store>;
  store.use = {};
  for (let k of Object.keys(store.getState())) {
    (store.use as any)[k] = () => store((s) => s[k as keyof typeof s]);
  }

  return store;
};

export default createSelectors;