class StorageArea extends ChromeObject {
 StorageArea();
 StorageArea.fromProxy(JsObject jsProxy): super.fromProxy(jsProxy);

 /**
  * Gets one or more items from storage.
  * 
  * [keys] A single key to get, list of keys to get, or a dictionary specifying
  * default values (see description of the object).  An empty list or object
  * will return an empty result object.  Pass in `null` to get the entire
  * contents of storage.
  * 
  * Returns:
  * Object with items in their key-value mappings.
  */
 Future<Map<String, dynamic>> get([dynamic keys]) {
   var completer = new ChromeCompleter<Map<String, dynamic>>.oneArg(mapify);
   jsProxy.callMethod('get', [jsify(keys), completer.callback]);
   return completer.future;
 }

 /**
  * Gets the amount of space (in bytes) being used by one or more items.
  * 
  * [keys] A single key or list of keys to get the total usage for. An empty
  * list will return 0. Pass in `null` to get the total usage of all of
  * storage.
  * 
  * Returns:
  * Amount of space being used in storage, in bytes.
  */
 Future<int> getBytesInUse([dynamic keys]) {
   var completer = new ChromeCompleter<int>.oneArg();
   jsProxy.callMethod('getBytesInUse', [jsify(keys), completer.callback]);
   return completer.future;
 }

 /**
  * Sets multiple items.
  * 
  * [items] An object which gives each key/value pair to update storage with.
  * Any other key/value pairs in storage will not be affected.
  * 
  * Primitive values such as numbers will serialize as expected. Values with a
  * `typeof` `"object"` and `"function"` will typically serialize to `{}`, with
  * the exception of `Array` (serializes as expected), `Date`, and `Regex`
  * (serialize using their `String` representation).
  */
 Future set(Map<String, dynamic> items) {
   var completer = new ChromeCompleter.noArgs();
   jsProxy.callMethod('set', [jsify(items), completer.callback]);
   return completer.future;
 }

 /**
  * Removes one or more items from storage.
  * 
  * [keys] A single key or a list of keys for items to remove.
  */
 Future remove(dynamic keys) {
   var completer = new ChromeCompleter.noArgs();
   jsProxy.callMethod('remove', [jsify(keys), completer.callback]);
   return completer.future;
 }

 /**
  * Removes all items from storage.
  */
 Future clear() {
   var completer = new ChromeCompleter.noArgs();
   jsProxy.callMethod('clear', [completer.callback]);
   return completer.future;
 }
}