Function whileMutating

src/store/index.ts:336–342

(action: () => Return)

    getListenerFunctions(() => store);

  const whileMutating = <Return>(action: () => Return): Return => {
    const wasMutating = mutating;
    mutating = 1;
    const result = action();
    mutating = wasMutating;
    return result;
  };

  const ifTransformed = <Value, Result>(
    snapshot: Value,