An userscript that shows a desktop notification when the status of a github PR changes

github_pr_notifications.user.js

// ==UserScript==
// @name        PR Notifications
// @namespace   ghnotifications
// @description Show notifications when the status of a PR changes
// @include     https://github.com/*
// @version     1
// @grant       none
// ==/UserScript==

(function(){
    if(Notification.permission !== 'denied' && Notification.permission !== 'granted') {
        Notification.requestPermission();
    }

    function getState() {
        var elm = document.querySelector('.merge-pr .branch-action');
        var match = elm && elm.getAttribute('class').match(/\bbranch-action-state-(\w+)/);
        return match && match[1];
    }

    var prevState = null;
    setInterval(function(){
        var newState = getState();
        if(prevState && newState && prevState != newState) {
            new Notification("Status changed from " + prevState + ' to ' + newState, {
                body: document.title,
                icon: 'https://github.com/apple-touch-icon.png'
            });
        }
        prevState = newState;
    }, 500);
})();