index.js

/**
 * @format
 */

import {AppRegistry} from 'react-native';
import App from './App';
import {name as appName} from './app.json';
import BackgroundFetch from 'react-native-background-fetch';
import {PushNotifications} from './src/services/push-notifications.service';

const pushNotifications = new PushNotifications();
pushNotifications.initBackgroundFetch();

let PushNotificationsHeadlessTask = async event => {
  // Get task id from event {}:
  let taskId = event.taskId;
  let isTimeout = event.timeout; // <-- true when your background-time has expired.
  if (isTimeout) {
    // This task has exceeded its allowed running-time.
    // You must stop what you're doing immediately finish(taskId)
    console.log('[BackgroundFetch] Headless TIMEOUT:', taskId);
    BackgroundFetch.finish(taskId);
    return;
  }
  console.log('[BackgroundFetch HeadlessTask] start: ', taskId);
  // let pushNotifications = await PushNotifications();
  await pushNotifications.emotivityCompletionNotification();
  // await pushNotifications.sayThanksCompletionNotification();
  // await pushNotifications.traxivityCompletionNotification();

  // Perform an example HTTP request.
  // Important:  await asychronous tasks when using HeadlessJS.
  // let response = await fetch('https://facebook.github.io/react-native/movies.json');
  // let responseJson = await response.json();
  // console.log('[BackgroundFetch HeadlessTask] response: ', responseJson);

  // Required:  Signal to native code that your task is complete.
  // If you don't do this, your app could be terminated and/or assigned
  // battery-blame for consuming too much time in background.
  BackgroundFetch.finish(taskId);
};

// Register your BackgroundFetch HeadlessTask
BackgroundFetch.registerHeadlessTask(PushNotificationsHeadlessTask);
AppRegistry.registerComponent(appName, () => App);