push.js

const FCM = require('fcm-node');

// put your server key here
const serverKey = '<your-server-key>';

const fcm = new FCM(serverKey);

function sendNotificationToFirebase(message) {
    return new Promise((resolve, reject) => {
      fcm.send(message, (err, response) => {
        if (err) {
          console.log('Something has gone wrong!', JSON.stringify(err));
          reject(err);
        } else {
          console.log('Successfully sent with response: ', response);
          resolve(response);
        }
      });
    });
}

async function sendChatAppMessage(tokens, badgeNumber) {
  const message = {
    registration_ids: tokens,
    notification: {
      title: 'New Notification',
      body: 'You have received notification',
      badge: badgeNumber
    },
    priority: 'high',
  };
  const response = await sendNotificationToFirebase(message);
  return response;
}

module.exports = {
  sendChatAppMessage
}