message: Add JS doc to indicate that the function may throw an error.
diff: @@ -21,6 +21,7 @@ export default class WidgetUtils {
  /* Returns true if user is able to send state events to modify widgets in this room
  * @param roomId -- The ID of the room to check
  * @return Boolean -- true if the user can modify widgets in this room
  + * @throws Error -- specifies the error reason
  */
  static canUserModifyWidgets(roomId) {
  if (!roomId) {
  