orb-ui-firebase/es/store/connection/actions.js

Firebase with redux

import * as types from './types';
import { logError } from '../errors/actions';

export function onConnectionStateChange(isConnected) {
  return {
    type: types.ON_CONNECTION_STATE_CHANGED,
    payload: { isConnected: isConnected }
  };
}

export function initConnection(firebaseApp, onChange) {
  return function (dispatch) {
    firebaseApp.database().ref('.info/connected').on('value', function (snapshot) {
      dispatch(onConnectionStateChange(snapshot.val()));

      if (onChange !== undefined && onChange instanceof Function) {
        onChange(snapshot.val());
      }
    }, function (err) {
      console.error(err);
      dispatch(logError('.info/connected', err));
    });
  };
}

export function unsubscribeConnection(firebaseApp) {
  return function (dispatch) {
    firebaseApp.database().ref('.info/connected').off();
    dispatch(onConnectionStateChange(false));
  };
}