Started working on 2 min heartbeats.

assets/js/events.js

@@ -0,0 +1,37 @@
+// What to do when the event page first loads?
+//
+// Functional style
+//
+// 1. Run a function every 2 mins DONE
+// 2. Check if the user is active (not idle)
+// If the user is active, get the current active tab URL
+// and send heartbeat to wakatime.
+//
+
+var WakaTime = require('./WakaTime');
+
+/**
+ * Whenever an alarms sets off, this function
+ * gets called to detect the alarm name and
+ * do appropriate action.
+ *
+ * @param alarm
+ */
+function resolveAlarm(alarm) {
+    // |alarm| can be undefined because onAlarm also gets called from
+    // window.setTimeout on old chrome versions.
+    if (alarm && alarm.name == 'heartbeatAlarm') {
+
+        console.log('heartbeatAlarm triggered');
+
+        var wakatime = new WakaTime;
+
+        wakatime.recordHeartbeat();
+    }
+}
+
+// Add a listener to resolve alarms
+chrome.alarms.onAlarm.addListener(resolveAlarm);
+
+// Create a new alarm for heartbeats.
+chrome.alarms.create('heartbeatAlarm', {periodInMinutes: 1});