Provider.js

import React, { PropTypes } from 'react'

const storeShape = PropTypes.shape({
  subscribe: PropTypes.func.isRequired,
  dispatch: PropTypes.func.isRequired,
  getState: PropTypes.func.isRequired
})

const subscriptionShape = PropTypes.shape({
  trySubscribe: PropTypes.func.isRequired,
  notifyNestedSubs: PropTypes.func.isRequired
})

class Provider extends React.Component {
  constructor(props, context) {
    super(props, context)
    this.store = props.store;
  }
  getChildContext() {
    return { store: this.store, parentSub: null }
  }
  render() {
    return React.Children.only(this.props.children)
  }
}
Provider.childContextTypes = {
  store: storeShape,
  parentSub: subscriptionShape,
}