autonomous.contact/public/js/notifications.js

const NOTIFICATIONS = {
	_notifications: [],

	send: function (message, options = {}) {
		if (!Notification || Notification.permission !== "granted") {
			return;
		}

		const notification = new Notification(message, options);
		this._notifications.push( notification );
		return notification;
	},

	close: function() {
		for ( const notification of this._notifications ) {
			notification?.close();
		}

		this._notifications.length = 0;
	},

	request_permission: function () {
		if (Notification && Notification.permission === "granted") {
			return;
		}

		Notification.requestPermission();
	},
};