store-listener.js

export default function createSocketListener(socket, store) {
  return event => {
    const action = JSON.parse(event.data);
    
    store.dispatch(action);
  }
}

// when creating your websocket connection

const socket = new WebSocket(/*...*/);

if (/* check if this is a 'follower' */) {
  socket.addEventListener('message', createSocketListener(socket, store));  
}