Allow root fields to be colocated.

src/HotChocolate/Core/src/Abstractions/DataLoaderAttribute.cs

@@ -7,17 +7,12 @@ namespace HotChocolate;
 /// types source generator to generate necessary code around this method.
 /// </summary>
 [AttributeUsage(AttributeTargets.Method)]
-public sealed class DataLoaderAttribute : Attribute
+public sealed class DataLoaderAttribute(string? name = null) : Attribute
 {
-    public DataLoaderAttribute(string? name = null)
-    {
-        Name = name;
-    }
-
     /// <summary>
     /// Gets the name override for the DataLoader or <c>null</c>.
     /// </summary>
-    public string? Name { get; }
+    public string? Name { get; } = name;
 
     /// <summary>
     /// Specifies how services by default are handled.

src/HotChocolate/Core/src/Abstractions/EventMessageAttribute.cs

@@ -3,7 +3,4 @@
 namespace HotChocolate;
 
 [AttributeUsage(AttributeTargets.Parameter)]
-public sealed class EventMessageAttribute
-    : Attribute
-{
-}
+public sealed class EventMessageAttribute : Attribute;

src/HotChocolate/Core/src/Abstractions/MutationFieldAttribute.cs

@@ -0,0 +1,6 @@
+using System;
+
+namespace HotChocolate;
+
+[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property)]
+public sealed class MutationFieldAttribute : Attribute;

src/HotChocolate/Core/src/Abstractions/QueryFieldAttribute.cs

@@ -0,0 +1,6 @@
+using System;
+
+namespace HotChocolate;
+
+[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property)]
+public sealed class QueryFieldAttribute : Attribute;

src/HotChocolate/Core/src/Abstractions/SubscriptionFieldAttribute.cs

@@ -0,0 +1,6 @@
+using System;
+
+namespace HotChocolate;
+
+[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property)]
+public sealed class SubscriptionFieldAttribute : Attribute;

src/HotChocolate/Core/src/Types.Analyzers/Errors.cs

@@ -0,0 +1,27 @@
+using HotChocolate.Types.Analyzers.Properties;
+using Microsoft.CodeAnalysis;
+
+namespace HotChocolate.Types.Analyzers;
+
+public static class Errors
+{
+    public static readonly DiagnosticDescriptor KeyParameterMissing =
+        new(
+            id: "HC0074",
+            title: "Parameter Missing.",
+            messageFormat:
+            SourceGenResources.DataLoader_KeyParameterMissing,
+            category: "DataLoader",
+            DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
+
+    public static readonly DiagnosticDescriptor MethodAccessModifierInvalid =
+        new(
+            id: "HC0075",
+            title: "Access Modifier Invalid.",
+            messageFormat:
+            SourceGenResources.DataLoader_InvalidAccessModifier,
+            category: "DataLoader",
+            DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
+}