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import { atom } from 'jotai'import type { WritableAtom } from 'jotai'
export function atomWithReducer<Value, Action>(  initialValue: Value,  reducer: (value: Value, action?: Action) => Value): WritableAtom<Value, Action | undefined>
export function atomWithReducer<Value, Action>(  initialValue: Value,  reducer: (value: Value, action: Action) => Value): WritableAtom<Value, Action>
export function atomWithReducer<Value, Action>(  initialValue: Value,  reducer: (value: Value, action: Action) => Value) {  const anAtom: any = atom(initialValue, (get, set, action: Action) =>    set(anAtom, reducer(get(anAtom), action))  )  return anAtom}