Re-implementing Recoil APIs / article gists

typings.ts

// @see https://github.com/NoriSte/recoil-apis

export type Atom<T> = { key: string; default: T };

export type Selector<T> = {
  key: string;
  get: ({ get }: { get: GetRecoilValue }) => T;
  set?: (
    {
      get,
      set
    }: {
      get: GetRecoilValue;
      set: SetRecoilValue;
    },
    nextValue: T
  ) => void;
};

export type RecoilValue<T> = Atom<T> | Selector<T>;

/**
 * Recoil id-free functions
 */
type GetRecoilValue = <T>(recoilValue: RecoilValue<T>) => T;
type SetRecoilValue = <T>(recoilValue: RecoilValue<T>, nextValue: T) => void;