-

Author: NSFatalError

Sources/PrincipleMacros/Builders/Declarations/Common/DeclBuilder.swift

@@ -32,4 +32,8 @@ extension DeclBuilder {
     public var preferredAccessControlLevel: AccessControlLevel? {
         nil
     }
+
+    public var inheritedAvailability: AttributeListSyntax? {
+        basicDeclaration.availability?.trimmed.withTrailingNewline
+    }
 }

Tests/PrincipleMacrosTests/Syntax/Extensions/AvailabilityTests.swift

@@ -39,6 +39,7 @@ internal struct AvailabilityTests {
         let decl: DeclSyntax = """
         #if os(macOS)
         @MainActor 
+        @available(macOS 26, *)
         #else
         @Observable
         @available(iOS 26, *)
@@ -48,6 +49,7 @@ internal struct AvailabilityTests {
 
         let expectation = """
         #if os(macOS)
+        @available(macOS 26, *)
         #else
         @available(iOS 26, *)
         #endif