apply ruleset, bump slevomat dependency

Author: klausi

coder_sniffer/Drupal/ruleset.xml

@@ -111,7 +111,7 @@
 
   <!-- PSR-2 sniffs -->
   <rule ref="PSR2.Classes.PropertyDeclaration">
-     <!-- Already covered by Drupal.Classes.PropertyDeclaration.VarUsed. -->
+    <!-- Already covered by Drupal.Classes.PropertyDeclaration.VarUsed. -->
     <exclude name="PSR2.Classes.PropertyDeclaration.VarUsed"/>
   </rule>
   <rule ref="PSR2.Namespaces.NamespaceDeclaration"/>
@@ -120,6 +120,22 @@
   <!-- SlevomatCodingStandard sniffs -->
   <rule ref="SlevomatCodingStandard.Classes.BackedEnumTypeSpacing"/>
   <rule ref="SlevomatCodingStandard.ControlStructures.RequireNullCoalesceOperator"/>
+  <!-- Allow global names with backslash like \Drupal. -->
+  <rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly">
+    <properties>
+      <property name="allowFullyQualifiedGlobalClasses" value="true"/>
+      <property name="allowFullyQualifiedGlobalFunctions" value="true"/>
+      <property name="allowFullyQualifiedGlobalConstants" value="true"/>
+      <property name="allowFallbackGlobalFunctions" value="true"/>
+      <property name="allowFallbackGlobalConstants" value="true"/>
+    </properties>
+  </rule>
+  <rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly.ReferenceViaFullyQualifiedName">
+    <exclude-pattern>*.api.php</exclude-pattern>
+  </rule>
+  <rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly.ReferenceViaFullyQualifiedNameWithoutNamespace">
+    <severity>0</severity>
+  </rule>
   <rule ref="SlevomatCodingStandard.PHP.ShortList"/>
   <rule ref="SlevomatCodingStandard.TypeHints.DeclareStrictTypes">
     <exclude name="SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing"/>

composer.json

@@ -18,7 +18,7 @@
         "ext-mbstring": "*",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.7.1 || ^1.0.0",
         "sirbrillig/phpcs-variable-analysis": "^2.11.7",
-        "slevomat/coding-standard": "^8.11",
+        "slevomat/coding-standard": "^8.15",
         "squizlabs/php_codesniffer": "^3.11.2",
         "symfony/yaml": ">=3.4.0"
     },