function Client(dsn, options) {
  if (dsn instanceof Client) return dsn;
  var ravenInstance = new Raven();
  return ravenInstance.config.apply(ravenInstance, arguments);
}
function Client(dsn, options) {
  if (dsn instanceof Client) return dsn;
  var ravenInstance = new Raven();
  return ravenInstance.config.apply(ravenInstance, arguments);
}
function Client ( dsn , options ) { if ( dsn instanceof Client ) return dsn ; var ravenInstance = new Raven ( ) ; return ravenInstance . config . apply ( ravenInstance , arguments ) ; }
Maintain old API compat, need to make sure arguments length is preserved
Maintain old API compat need to make sure arguments length is preserved
Create a new client