Detecting web bluetooth disconnection

If a puck disconnects from my browser due to the connection dropping out (e.g. it moves out of range) is there a way to detect this on the web front end? I can see that puck.js creates the following console log:
Disconnected (gattserverdisconnected)

I’m using the following code snippet to create a 2-way connection as per one of your site tutorials. This includes the part about resetting the puck on disconnection, which seems to work fine on the puck - I just want to be able to reset the browser too.

Puck.connect(function(connection) { 
	connection.on("data", function(d) { 
		// handle receiving data 
	} 
	connection.write("reset();\n", function() { 
		setTimeout(function(){ 
			// do various stuff here 
			// reset on disconnect 
			connection.write("NRF.on('disconnect',fu­nction(){ reset(); });\n",function(){}); 
		},1500); 
	}); 
	// I'm hoping there's a way to detect disconnection here 
	// e.g. connection.on("disconnect", function(){}); 
}); 

Thanks!