App.js

import ApolloClient, { createNetworkInterface } from 'apollo-client'
import {SubscriptionClient, addGraphQLSubscriptions} from 'subscriptions-transport-ws'
import { ApolloProvider } from 'react-apollo'
// Create WebSocket client
const wsClient = new SubscriptionClient(`wss://subscriptions.graph.cool/v1/__PROJECT ID__`, {
  reconnect: true,
  connectionParams: {
    // Pass any arguments you want for initialization
  }
})
const networkInterface = createNetworkInterface({ uri: 'https://api.graph.cool/simple/v1/__PROJECT ID__' })
// Extend the network interface with the WebSocket
const networkInterfaceWithSubscriptions = addGraphQLSubscriptions(
  networkInterface,
  wsClient
)
const client = new ApolloClient({
  networkInterface: networkInterfaceWithSubscriptions,
})