Split TypeFilters into two parts: one for any .NET and one for Unity

Types/TypeFilters.Unity.cs

@@ -0,0 +1,40 @@
+#if UNITY_2021_3_OR_NEWER
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+using Object = UnityEngine.Object;
+
+namespace Exanite.Core.Types
+{
+    public static partial class TypeFilters
+    {
+        /// <summary>
+        /// Types ignored by the <see cref="UnitySmart"/> <see cref="ITypeFilter"/>.
+        /// </summary>
+        public static IReadOnlyCollection<Type> UnityIgnoredTypes { get; }
+
+        public static ITypeFilter UnitySmart { get; }
+
+        static TypeFilters()
+        {
+            UnityIgnoredTypes = new HashSet<Type>
+            {
+                typeof(MonoBehaviour),
+                typeof(Behaviour),
+                typeof(Component),
+                typeof(ScriptableObject),
+                typeof(Object),
+                typeof(UIBehaviour),
+                typeof(Graphic),
+                typeof(MaskableGraphic),
+            };
+
+            UnitySmart = new TypeFilter()
+                .Add(new InheritanceHierarchyTypeFilter(UnityIgnoredTypes, false, false))
+                .Interfaces();
+        }
+    }
+}
+#endif

Types/TypeFilters.cs

@@ -1,47 +1,10 @@
-using System;
-using System.Collections.Generic;
-#if UNITY_2021_3_OR_NEWER
-using UnityEngine;
-using UnityEngine.EventSystems;
-using UnityEngine.UI;
-using Object = UnityEngine.Object;
-#endif
-
 namespace Exanite.Core.Types
 {
-    public static class TypeFilters
+    public static partial class TypeFilters
     {
         public static ITypeFilter Self { get; } = new SelfTypeFilter();
         public static ITypeFilter Interface { get; } = new InterfaceTypeFilter();
         public static ITypeFilter InheritanceHierarchy { get; } = new InheritanceHierarchyTypeFilter();
         public static ITypeFilter Smart { get; } = new TypeFilter().InheritanceHierarchy().Interfaces();
-
-#if UNITY_2021_3_OR_NEWER
-        /// <summary>
-        /// Types ignored by the <see cref="UnitySmart"/> <see cref="ITypeFilter"/>.
-        /// </summary>
-        public static IReadOnlyCollection<Type> UnityIgnoredTypes { get; }
-
-        public static ITypeFilter UnitySmart { get; }
-
-        static TypeFilters()
-        {
-            UnityIgnoredTypes = new HashSet<Type>
-            {
-                typeof(MonoBehaviour),
-                typeof(Behaviour),
-                typeof(Component),
-                typeof(ScriptableObject),
-                typeof(Object),
-                typeof(UIBehaviour),
-                typeof(Graphic),
-                typeof(MaskableGraphic),
-            };
-
-            UnitySmart = new TypeFilter()
-                .Add(new InheritanceHierarchyTypeFilter(UnityIgnoredTypes, false, false))
-                .Interfaces();
-        }
-#endif
     }
 }