Notification api

notify.js

		const notificationGrantedPromise = () => {
			if (!('Notification' in window)) {
				return Promise.reject();
			}
			return (Notification.permission !== 'default') ? Promise.resolve(Notification.permission) : Notification.requestPermission();
		};
		const notify = (...args) => notificationGrantedPromise().then((permission) => permission === 'granted' ? new Notification(...args) : null);