feat: make most classes sealed

BREAKING CHANGE: The following classes are now sealed: AssetPathAttribute, Dependency, DependencyAttribute, DependencyInjector, DiContainer, DiContext, LayoutAttribute, MissingProviderException, ProvideAttribute, QueryAttribute, RootClassAttribute, StylesheetAttribute, TestBed, TestBedBuilder, TestBedTimeoutException.

Assets/UIComponents/Core/AssetPathAttribute.cs

@@ -31,7 +31,7 @@ namespace UIComponents
     /// </example>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
     [BaseTypeRequired(typeof(UIComponent))]
-    public class AssetPathAttribute : Attribute
+    public sealed class AssetPathAttribute : Attribute
     {
         public readonly string Path;
 
@@ -40,4 +40,4 @@ public AssetPathAttribute(string path)
             Path = path;
         }
     }
-}
+}

Assets/UIComponents/Core/DependencyInjection/Dependency.cs

@@ -6,7 +6,7 @@ namespace UIComponents.DependencyInjection
     /// <summary>
     /// An internal class for provided dependencies.
     /// </summary>
-    internal class Dependency
+    internal sealed class Dependency
     {
         /// <summary>
         /// The instance of the dependency which is provided to consumers.
@@ -88,4 +88,4 @@ public void Clear()
             Instance = null;
         }
     }
-}
+}

Assets/UIComponents/Core/DependencyInjection/DependencyAttribute.cs

@@ -7,7 +7,7 @@ namespace UIComponents
     /// </summary>
     /// <seealso cref="UIComponent"/>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
-    public class DependencyAttribute : Attribute
+    public sealed class DependencyAttribute : Attribute
     {
         public readonly Type DependencyType;
 
@@ -22,4 +22,4 @@ public DependencyAttribute(Type dependency, Type provide, Scope scope = Scope.Si
             Scope = scope;
         }
     }
-}
+}

Assets/UIComponents/Core/DependencyInjection/DependencyInjector.cs

@@ -10,7 +10,7 @@ namespace UIComponents.DependencyInjection
     /// </summary>
     /// <seealso cref="UIComponent"/>
     /// <seealso cref="DependencyAttribute"/>
-    public class DependencyInjector
+    public sealed class DependencyInjector
     {
         private readonly DiContainer _container;
 

Assets/UIComponents/Core/DependencyInjection/DiContainer.cs

@@ -7,7 +7,7 @@ namespace UIComponents.DependencyInjection
     /// <summary>
     /// A class for storing injectors and singleton instances.
     /// </summary>
-    public class DiContainer
+    public sealed class DiContainer
     {
         /// <summary>
         /// Contains all injectors created for consumers.

Assets/UIComponents/Core/DependencyInjection/DiContext.cs

@@ -6,7 +6,7 @@ namespace UIComponents.DependencyInjection
     /// <summary>
     /// Dependency injection context for consumers.
     /// </summary>
-    public class DiContext
+    public sealed class DiContext
     {
         /// <summary>
         /// The current dependency injection context.
@@ -138,4 +138,4 @@ public void RemoveInjector(Type consumerType)
             Container.RemoveInjector(consumerType);
         }
     }
-}
+}

Assets/UIComponents/Core/Exceptions/MissingProviderException.cs

@@ -5,7 +5,7 @@ namespace UIComponents
     /// <summary>
     /// Thrown when a dependency does not have a provider.
     /// </summary>
-    public class MissingProviderException : Exception
+    public sealed class MissingProviderException : Exception
     {
         /// <summary>
         /// The dependency type.
@@ -20,4 +20,4 @@ public MissingProviderException(Type dependencyType)
 
         public override string Message { get; }
     }
-}
+}

Assets/UIComponents/Core/LayoutAttribute.cs

@@ -9,11 +9,11 @@ namespace UIComponents
     /// <seealso cref="AssetPathAttribute"/>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
     [BaseTypeRequired(typeof(UIComponent))]
-    public class LayoutAttribute : PathAttribute
+    public sealed class LayoutAttribute : PathAttribute
     {
         public LayoutAttribute(string path)
         {
             Path = path;
         }
     }
-}
+}

Assets/UIComponents/Core/ProvideAttribute.cs

@@ -27,7 +27,7 @@ namespace UIComponents
     /// <seealso cref="DependencyAttribute"/>
     [AttributeUsage(AttributeTargets.Field)]
     [MeansImplicitUse]
-    public class ProvideAttribute : Attribute
+    public sealed class ProvideAttribute : Attribute
     {
         /// <summary>
         /// If set, an instance of the specified type will be provided and

Assets/UIComponents/Core/QueryAttribute.cs

@@ -29,7 +29,7 @@ namespace UIComponents
     /// </example>
     [AttributeUsage(AttributeTargets.Field, AllowMultiple = true)]
     [MeansImplicitUse]
-    public class QueryAttribute : Attribute
+    public sealed class QueryAttribute : Attribute
     {
         /// <summary>
         /// USS name to query by.

Assets/UIComponents/Core/RootClassAttribute.cs

@@ -8,7 +8,7 @@ namespace UIComponents
     /// </summary>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
     [BaseTypeRequired(typeof(UIComponent))]
-    public class RootClassAttribute : UIComponentEffectAttribute
+    public sealed class RootClassAttribute : UIComponentEffectAttribute
     {
         private readonly string _className;
 

Assets/UIComponents/Core/StylesheetAttribute.cs

@@ -9,11 +9,11 @@ namespace UIComponents
     /// <seealso cref="AssetPathAttribute"/>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
     [BaseTypeRequired(typeof(UIComponent))]
-    public class StylesheetAttribute : PathAttribute
+    public sealed class StylesheetAttribute : PathAttribute
     {
         public StylesheetAttribute(string path)
         {
             Path = path;
         }
     }
-}
+}

Assets/UIComponents/Testing/TestBed.cs

@@ -12,7 +12,7 @@ namespace UIComponents.Testing
     /// <para/>
     /// You can initialize an instance with <see cref="Create"/>.
     /// </summary>
-    public class TestBed
+    public sealed class TestBed
     {
         /// <summary>
         /// Timeout for async operations. Defaults to eight seconds.

Assets/UIComponents/Testing/TestBedBuilder.cs

@@ -5,7 +5,7 @@ namespace UIComponents.Testing
     /// <summary>
     /// A class for configuring a <see cref="TestBed"/> instance with dependencies.
     /// </summary>
-    public class TestBedBuilder
+    public sealed class TestBedBuilder
     {
         private readonly TestBed _testBed;
 

Assets/UIComponents/Testing/TestBedTimeoutException.cs

@@ -5,7 +5,7 @@ namespace UIComponents.Testing
     /// <summary>
     /// Thrown when an asynchronous TestBed operation times out.
     /// </summary>
-    public class TestBedTimeoutException : Exception
+    public sealed class TestBedTimeoutException : Exception
     {
         public override string Message { get; }