RelayNetworkLayer.js

// @flow

import Relay from 'react-relay';

import Storage from './utils/Storage';

const TOKEN_KEY = 'TW_USER_TOKEN';

let _token = Storage.getItem(TOKEN_KEY, null);

export const updateToken = (token: string) => {
  _token = token;
  Storage.setItem(TOKEN_KEY, token);
};

export class RelayNetworkLayer extends Relay.DefaultNetworkLayer {
  constructor() {
    const graphqlURL = 'http://localhost:8888/dev/graphql';

    super(graphqlURL, {
      get headers() {
        if (_token) {
          return { Authorization: `JWT ${_token}` };
        }
        return undefined;
      },
    });
  }
}