Fix schema settings serialization during export

src/HotChocolate/AspNetCore/test/AspNetCore.CommandLine.Tests/SchemaExportCommandTests.cs

@@ -143,6 +143,62 @@ public async Task App_Should_WriteNamedSchemaToOutput_When_SchemaNameIsSpecified
         output.ToString().MatchSnapshot();
     }
 
+    [Fact]
+    public async Task App_Should_PreserveUnescapedAngleBrackets_When_UpdatingExistingSettingsFile()
+    {
+        // arrange
+        var services = new ServiceCollection();
+        services.AddGraphQL()
+            .AddQueryType(x => x.Name("Query").Field("foo").Resolve("bar"));
+
+        var hostMock = new Mock<IHost>();
+        hostMock
+            .Setup(x => x.Services)
+            .Returns(services.BuildServiceProvider());
+
+        var host = hostMock.Object;
+        var output = new StringWriter();
+        var app = new App(host);
+        var tempFile = CreateSchemaFileName();
+        var settingsFile = tempFile + "-settings.json";
+
+        const string existingSettings =
+            """
+            {
+              "name": "default",
+              "satisfiability": {
+                "ignoredNonAccessibleFields": {
+                  "Foo.bar": [
+                    "Schema1:Query.foo<Bar>"
+                  ]
+                }
+              }
+            }
+            """;
+
+        await File.WriteAllTextAsync(settingsFile, existingSettings);
+
+        // act
+        await app.InvokeAsync($"schema export --output {tempFile}", output);
+
+        // assert
+        var actual = await File.ReadAllTextAsync(settingsFile);
+        actual.ReplaceLineEndings("\n").MatchInlineSnapshot(
+            """
+            {
+              "name": "_Default",
+              "satisfiability": {
+                "ignoredNonAccessibleFields": {
+                  "Foo.bar": [
+                    "Schema1:Query.foo<Bar>"
+                  ]
+                }
+              }
+            }
+
+            """);
+    }
+
     [Fact]
     public async Task App_Should_Return_ExitCode_1_If_Schema_Is_Invalid()
     {

src/HotChocolate/Core/src/Types/Execution/Internal/SchemaFileExporter.cs

@@ -1,4 +1,5 @@
 using System.Text;
+using System.Text.Encodings.Web;
 using System.Text.Json;
 using System.Text.Json.Nodes;
 using HotChocolate.Serialization;
@@ -7,6 +8,12 @@ namespace HotChocolate.Execution.Internal;
 
 internal static class SchemaFileExporter
 {
+    private static readonly JsonWriterOptions s_writerOptions = new()
+    {
+        Indented = true,
+        Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
+    };
+
     public static async Task<SchemaFileInfo> Export(
         string schemaFileName,
         IRequestExecutor executor,
@@ -84,7 +91,7 @@ private static async Task<bool> TryUpdateSettingsFile(
                 obj["name"] = schemaName;
 
                 await using var writeStream = File.Create(fileName);
-                await using var writer = new Utf8JsonWriter(writeStream, new JsonWriterOptions { Indented = true });
+                await using var writer = new Utf8JsonWriter(writeStream, s_writerOptions);
                 root.WriteTo(writer);
                 await writer.FlushAsync(cancellationToken);
                 await writeStream.WriteAsync(Encoding.UTF8.GetBytes(Environment.NewLine), cancellationToken);
@@ -105,7 +112,7 @@ private static async Task CreateNewSettingsFile(
         CancellationToken cancellationToken)
     {
         await using var settingsFileStream = File.Create(fileName);
-        await using var jsonWriter = new Utf8JsonWriter(settingsFileStream, new JsonWriterOptions { Indented = true });
+        await using var jsonWriter = new Utf8JsonWriter(settingsFileStream, s_writerOptions);
 
         jsonWriter.WriteStartObject();