Add nullable enable directives to generated files

Author: Sergio0694

CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservablePropertyGenerator.Execute.cs

@@ -311,6 +311,7 @@ public static MemberDeclarationSyntax GetSyntax(PropertyInfo propertyInfo)
             //
             // // <auto-generated/>
             // #pragma warning disable
+            // #nullable enable
             // namespace CommunityToolkit.Mvvm.ComponentModel.__Internals
             // {
             //     [global::System.CodeDom.Compiler.GeneratedCode("...", "...")]
@@ -327,7 +328,8 @@ public static MemberDeclarationSyntax GetSyntax(PropertyInfo propertyInfo)
                 CompilationUnit().AddMembers(
                 NamespaceDeclaration(IdentifierName("CommunityToolkit.Mvvm.ComponentModel.__Internals")).WithLeadingTrivia(TriviaList(
                     Comment("// <auto-generated/>"),
-                    Trivia(PragmaWarningDirectiveTrivia(Token(SyntaxKind.DisableKeyword), true)))).AddMembers(
+                    Trivia(PragmaWarningDirectiveTrivia(Token(SyntaxKind.DisableKeyword), true)),
+                    Trivia(NullableDirectiveTrivia(Token(SyntaxKind.EnableKeyword), true)))).AddMembers(
                 ClassDeclaration(ContainingTypeName).AddModifiers(
                     Token(SyntaxKind.InternalKeyword),
                     Token(SyntaxKind.StaticKeyword)).AddAttributeLists(

CommunityToolkit.Mvvm.SourceGenerators/Models/HierarchyInfo.Syntax.cs

@@ -61,7 +61,7 @@ public CompilationUnitSyntax GetCompilationUnit(
         //
         // <auto-generated/>
         // #pragma warning disable
-        //
+        // #nullable enable
         // namespace <NAMESPACE>
         // {
         //     <TYPE_HIERARCHY>
@@ -71,7 +71,8 @@ public CompilationUnitSyntax GetCompilationUnit(
             NamespaceDeclaration(IdentifierName(Namespace))
             .WithLeadingTrivia(TriviaList(
                 Comment("// <auto-generated/>"),
-                Trivia(PragmaWarningDirectiveTrivia(Token(SyntaxKind.DisableKeyword), true))))
+                Trivia(PragmaWarningDirectiveTrivia(Token(SyntaxKind.DisableKeyword), true)),
+                Trivia(NullableDirectiveTrivia(Token(SyntaxKind.EnableKeyword), true))))
             .AddMembers(typeDeclarationSyntax))
             .NormalizeWhitespace(eol: "\n");
     }