Push.js is a cross-browser JavaScript library for displaying native desktop notifications from web applications. It wraps the divergent browser notification APIs into a single consistent interface, handling permission requests through a promise-based flow and providing graceful fallback when the native Notification API is unavailable.
The library distinguishes itself through its event-driven lifecycle hooks, which expose callbacks for notification events such as show, click, close, and error. It also supports programmatic dismissal by returning a notification handle with a close method, and includes a timeout-based queue that stores notifications during user absence and replays them upon return. Scheduled delivery is handled through an internal timer that delays notification display to a specified future timestamp.
The project covers the full lifecycle of desktop notification management, including display, permission requests, queuing during absence, programmatic closure, and scheduled delivery. It accepts a single configuration object with properties for title, body, icon, timeout, and scheduling, and degrades to in-page or console notifications when the native API is not supported.