importScripts('node_modules/firebase/firebase-app.js');

importScripts('node_modules/firebase/firebase-messaging.js');

firebase.initializeApp({

messagingSenderId: '{$ firebase.messagingSenderId $}',

});

const messaging = firebase.messaging();

messaging.setBackgroundMessageHandler(({ data }) => {

const notification = Object.assign({}, data, {

data: {

click_action: data.click_action,

},

});

return self.registration.showNotification(notification.title, notification);

});

self.addEventListener('notificationclick', event => {

const url = event.notification.data.click_action && event.notification.data.click_action.startsWith('/')

? `${self.origin}${event.notification.data.click_action}`

: event.notification.data.click_action;

event.waitUntil(clients.openWindow(url));

});