--- date: 2020-11-09 id: eaf00cf5-efb7-4f53-b721-4f0592671400 title: Symfony 4.0 --- # What's new ## Profiler - [Validator information in the Symfony profiler](20201109140046-validator_information_in_the_symfony_profiler) - [User impersonation in debug toolbar](20201109143336-symfony_user_impersonation_in_debug_toolbar) ## Validation ### Constraints - [ExpressionLanguage Constraint](20201109150640-expressionlanguage_constraint) - [Groups support for Valid constraint](20201109145724-groups_support_for_valid_constraint) ## Annotations - [Prefix all controller route names](20201109142351-prefix_all_controller_route_names) ## Subscribers - [Subscribing to events in the micro kernel](20201109150109-subscribing_to_events_in_the_micro_kernel) ## Components ### Stopwatch - [reset() method](20201109141042-reset_method) - [Microseconds support](20201109141116-microseconds_support) ### Command - [Lazy Commands](20201109141540-lazy_commands) ### Translation - [XLIFF 2.0](20201109142907-xliff_2_0) ### Guard - [getCredentials() responsibilities split](20201109152527-getcredentials_responsibilities_split) ## Sessions - [Lazy Sessions](20201109151019-lazy_sessions) ## Commands - [debug:autowiring](20201109151937-debug_autowiring) - [debug:form](20201109152714-debug_form) ## Autowiring - [Local Service Binding](20201109153159-local_service_binding)