background.js

//Check if TrelloScrum is installed
// id as of v. 0.53
var trelloScrumExtensionId = "jdbcdblgjdpmfninkoogcfpnkjmndgje";
var trelloScrumInstalled=false;
chrome.extension.sendRequest(trelloScrumExtensionId, {getTargetData: true},
  function(response) {
  	console.log("Options :: Checking if Trello Scrum ("+trelloScrumExtensionId+") is installed: "+response);
  	trelloScrumInstalled = true;
});

chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
	if (request.method == "getLocalStorage") {
		if (request.key==="pointpicker") {
			var pointPickerSettings = {
				type: localStorage["pointsSequence"],
				values: localStorage["pointsSequence-values"]
			};
			sendResponse({
				data : pointPickerSettings
			});
		}else {
			sendResponse({
				data : localStorage[request.key]
			});
		}
		console.log("Options :: Received request: " + request.method + " from " + sender+" = "+localStorage[request.key]);
	}else if (request.method == "trelloScrumInstalled") {
		sendResponse({
			data : trelloScrumInstalled
		});
	} else {
		sendResponse({}); // snub them.
	}
});