apollo configuration file

apollo.js

import ApolloClient, {createNetworkInterface} from 'apollo-client'
import {addTypenameToSelectionSet} from 'apollo-client/queries/queryTransform'
import baseURL from './url' // we could use a string url here  for example localhost:port/

const getLoginToken = function () {
  return window.localStorage['Meteor.loginToken']
}

export const createMeteorNetworkInterface = () => {
  let uri = baseURL + '/graphql'
  const networkInterface = createNetworkInterface({uri})

  networkInterface.use([{
    applyMiddleware (request, next) {
      if (!request.options.headers) {
        request.options.headers = new window.Headers()
      }

      const currentUserToken = getLoginToken()
      request.options.headers.Authorization = currentUserToken
      next()
    }
  }])

  return networkInterface
}
// set the configuration for the apollo client
const config = {
  networkInterface: createMeteorNetworkInterface(),
  queryTransformer: addTypenameToSelectionSet,
  dataIdFromObject: (result) => {
    if (result._id && result.__typename) {
      return result.__typename + ':' + result._id
    } else if (result.key && result.__typename) {
      return result.__typename + ':' + result.key
    }
  },
  shouldBatch: false
}
// create the instance
const apollo = new ApolloClient(config)

export default apollo