Self check - detect all dead members (#295)

Author: janedbal

phpstan.neon.dist

@@ -50,6 +50,15 @@ parameters:
         enforceClosureParamNativeTypehint:
             enabled: false # we support even PHP 7.4 (cannot use mixed nor unions)
 
+    shipmonkDeadCode:
+        detect:
+            deadMethods: true
+            deadConstants: true
+            deadEnumCases: true
+            deadProperties:
+                neverRead: true
+                neverWritten: true
+
     ignoreErrors:
         -
             message: "#but it's missing from the PHPDoc @throws tag\\.$#" # allow uncatched exceptions in tests