react-obcache - api redesign

1.cache.js

import ObCache from 'obcache';
var cache = new ObCache();

cache.register('userInfo', ([id]) => functionThatReturnsAPromise(id));

export default cache;

2.UserInfo.js

import React from 'react';
import cache from './cache';
import {providesCacheObserver} from 'react-obcache';

export class UserInfo extends React.Component {
  renderWithCache = (getFromCache) => {
    var user = getFromCache('userInfo', this.props.userId);
    
    if (user.error) return <div>404</div>;
    if (!user.data) return <div>Loading</div>;
    
    return (
      <div>
        {user.data.firstName} {user.lastName}
      </div>
    );
  }
  
  render() {
    this.props.renderAndTrack(this.renderWithCache);
  }
}

export default providesCacheObserver({cache}, UserInfo);