const idleHandler   = require('dw-idle-handler');

idleHandler.start({
   timeout  : 30, // minutes 
   inactive : 5  
});

idleHandler.on("timeout",(e)=>{
   if(e.tab.lastFocus){
      //this was the last focused browser tab
   }
});

idleHandler.on("inactive",()=>{
   //window is inactive
});

idleHandler.on("active",()=>{
   //window is active
   //Detected user interaction by one of this events : click, keypress, mouseover and touchstart
});

idleHandler.start({
    timeout  : 30, // minutes 
    inactive : 5  
});
idleHandler.subscribe("onIdle",callback);
idleHandler.subscribe("onInactive",callback);
idleHandler.subscribe("onActive",callback);