Add FeatureSwitchDefinitionAttribute

Author: SimonCropp

src/Consume/Consume.cs

@@ -50,6 +50,7 @@ class Consume
         type = typeof(CallerArgumentExpressionAttribute);
         type = typeof(IsExternalInit);
         type = typeof(FeatureGuardAttribute);
+        type = typeof(FeatureSwitchDefinitionAttribute);
         type = typeof(ModuleInitializerAttribute);
         type = typeof(RequiredMemberAttribute);
         type = typeof(SetsRequiredMembersAttribute);

src/Polyfill/FeatureSwitchDefinitionAttribute.cs

@@ -0,0 +1,43 @@
+// <auto-generated />
+#pragma warning disable
+
+#if !NET9_0_OR_GREATER
+
+namespace System.Diagnostics.CodeAnalysis;
+
+using Diagnostics;
+using Diagnostics.CodeAnalysis;
+using Link = ComponentModel.DescriptionAttribute;
+
+
+/// <summary>
+/// [AttributeUsage(AttributeTargets.Property, Inherited = false)]
+/// </summary>
+[ExcludeFromCodeCoverage]
+[DebuggerNonUserCode]
+[AttributeUsage(AttributeTargets.Property, Inherited = false)]
+//Link:https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.featureswitchdefinitionattribute
+#if PolyPublic
+public
+#endif
+sealed class FeatureSwitchDefinitionAttribute : Attribute
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="FeatureSwitchDefinitionAttribute"/> class
+    /// with the specified feature switch name.
+    /// </summary>
+    /// <param name="switchName">
+    /// The name of the feature switch that provides the value for the specified property.
+    /// </param>
+    public FeatureSwitchDefinitionAttribute(string switchName)
+    {
+        SwitchName = switchName;
+    }
+
+    /// <summary>
+    /// The name of the feature switch that provides the value for the specified property.
+    /// </summary>
+    public string SwitchName { get; }
+}
+
+#endif