Require arrow functions

Author: simPod

phpcs.xml.dist

@@ -10,6 +10,7 @@
     <rule ref="SlevomatCodingStandard.Classes.RequireConstructorPropertyPromotion" />
     <rule ref="SlevomatCodingStandard.ControlStructures.RequireNullSafeObjectOperator" />
     <rule ref="SlevomatCodingStandard.Exceptions.RequireNonCapturingCatch" />
+    <rule ref="SlevomatCodingStandard.Functions.RequireArrowFunction" />
     <rule ref="SlevomatCodingStandard.Functions.RequireTrailingCommaInDeclaration" />
     <rule ref="SlevomatCodingStandard.TypeHints.UnionTypeHintFormat">
         <properties>