let Storage = {};

Storage.save = browser.storage.local.set;
Storage.load = browser.storage.local.get;
Storage.remove = browser.storage.local.remove;

Storage.saveSync = browser.storage.sync.set;
Storage.loadSync = browser.storage.sync.get;
Storage.removeSync = browser.storage.sync.remove;

Storage.callbacks = {};
Storage.onChange = function(key, fn){
	if(!Storage.callbacks[key]) Storage.callbacks[key] = [];
	Storage.callbacks[key].push(fn);
}
Storage.emit = function(key, newValue){
	if(!Storage.callbacks[key]) return;
	Storage.callbacks[key].forEach(x => {
		x(newValue);
	});
}
chrome.storage.onChanged.addListener(function(objects, area){
	if(area!="local") return;
	for(let id in objects){
		let newValue = objects[id].newValue;
		if(newValue) { Storage.emit(id, newValue); }
	}
});