feat(JsonTransformer): add AOT support and configure JSON serializer options

Author: hjgraca

libraries/src/AWS.Lambda.Powertools.Parameters/Internal/Transform/JsonTransformer.cs

@@ -23,12 +23,31 @@ namespace AWS.Lambda.Powertools.Parameters.Internal.Transform;
 /// </summary>
 internal class JsonTransformer : ITransformer
 {
+    private readonly JsonSerializerOptions _options;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="JsonTransformer"/> class.
+    /// </summary>
+    public JsonTransformer()
+    {
+        _options = new JsonSerializerOptions
+        {
+            PropertyNameCaseInsensitive = true
+        };
+    }
+
     /// <summary>
     /// Deserialize a JSON value from a JSON string.
     /// </summary>
     /// <param name="value">JSON string.</param>
     /// <typeparam name="T">JSON value type.</typeparam>
     /// <returns>JSON value.</returns>
+#if NET6_0_OR_GREATER
+    [System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessage("AOT", "IL3050:RequiresDynamicCode",
+        Justification = "Types are expected to be known at compile time")]
+    [System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessage("Trimming", "IL2026:RequiresUnreferencedCode",
+        Justification = "Types are expected to be preserved")]
+#endif
     public T? Transform<T>(string value)
     {
         if (typeof(T) == typeof(string))
@@ -37,6 +56,6 @@ internal class JsonTransformer : ITransformer
         if (string.IsNullOrWhiteSpace(value))
             return default;
 
-        return JsonSerializer.Deserialize<T>(value);
+        return JsonSerializer.Deserialize<T>(value, _options);
     }
 }

libraries/tests/AWS.Lambda.Powertools.Parameters.Tests/AppConfig/AppConfigProviderTest.cs

@@ -13,6 +13,7 @@
  * permissions and limitations under the License.
  */
 
+using System.Diagnostics.CodeAnalysis;
 using System.Text;
 using System.Text.Json;
 using System.Text.Json.Nodes;
@@ -32,6 +33,7 @@
 
 namespace AWS.Lambda.Powertools.Parameters.Tests.AppConfig;
 
+[SuppressMessage("Usage", "xUnit1030:Do not call ConfigureAwait(false) in test method")]
 public class AppConfigProviderTest
 {
     [Fact]