app/socket_coordinator.js


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import { socketServer } from './config/config';

const internals = {

  socket: null, // stores the socket connection

  connect() {

    internals.socket = new WebSocket(socketServer);
  }
};

export const onMessage = function (listener) {

  if (!internals.socket) {
    internals.connect();
  }

  internals.socket.addEventListener('message', (message) => {

    listener(JSON.parse(message.data));
  });
};