是否可以使用apollo-link-state将javascript函数添加到本地状态？

Question

基本上我想做这样的事情（将函数myCallback添加到待办事项的callBack字段）：

./解析器/待办事项：

const myCallback = () => {
  console.log('callback run');
};

const todos = {
  defaults: {
    todos: [
      {
        id: '2',
        text: 'Hi',
        completed: false,
        callBack: myCallback, // <-- Add the callback here
        __typename: 'todo',
      },
    ],
  },
};

export default todos;

但我收到错误：错误：将结果写入存储以查询未定义/ nCannot读取属性'substring'未定义

我的应用初始化如下：

import React from 'react';
import { render } from 'react-dom';
import { ApolloClient } from 'apollo-client';
import { withClientState } from 'apollo-link-state';
import { InMemoryCache } from 'apollo-cache-inmemory';
import { ApolloProvider } from 'react-apollo';

import todos from './resolvers/todos';

const cache = new InMemoryCache();

const client = new ApolloClient({
  cache,
  link: withClientState({ ...todos, cache }),
});

render(
  <ApolloProvider client={client}>
    <div />
  </ApolloProvider>,
  document.getElementById('root')
);

这可能与apollo-link-state有关，还是我做错了？