From 88e16fb2d8c45d036d56245f9495a024e9bc2b9c Mon Sep 17 00:00:00 2001
From: Andrew Heard <andrewheard@google.com>
Date: Thu, 14 Aug 2025 16:11:07 -0400
Subject: [PATCH 1/2] [Firebase AI] Add `Sendable` conformance to
 `PartsRepresentable`

---
 FirebaseAI/Sources/PartsRepresentable.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/FirebaseAI/Sources/PartsRepresentable.swift b/FirebaseAI/Sources/PartsRepresentable.swift
index 82d0688df38..2de636e73c2 100644
--- a/FirebaseAI/Sources/PartsRepresentable.swift
+++ b/FirebaseAI/Sources/PartsRepresentable.swift
@@ -17,7 +17,7 @@ import Foundation
 /// A protocol describing any data that could be serialized to model-interpretable input data,
 /// where the serialization process cannot fail with an error.
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
-public protocol PartsRepresentable {
+public protocol PartsRepresentable: Sendable {
   var partsValue: [any Part] { get }
 }
 

From ffdf538a6bd793a2b44700f0393f7ea5596b512f Mon Sep 17 00:00:00 2001
From: Andrew Heard <andrewheard@google.com>
Date: Thu, 14 Aug 2025 18:51:46 -0400
Subject: [PATCH 2/2] Try workaround for `Sendable` on Xcode 16.2

---
 .../Sources/PartsRepresentable+Image.swift    | 41 +++++++++++++++----
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/FirebaseAI/Sources/PartsRepresentable+Image.swift b/FirebaseAI/Sources/PartsRepresentable+Image.swift
index 5bedeb8f3d1..cfab1a69083 100644
--- a/FirebaseAI/Sources/PartsRepresentable+Image.swift
+++ b/FirebaseAI/Sources/PartsRepresentable+Image.swift
@@ -50,8 +50,8 @@ enum ImageConversionError: Error {
 #elseif canImport(AppKit)
   /// Enables images to be representable as ``PartsRepresentable``.
   @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
-  extension NSImage: PartsRepresentable {
-    public var partsValue: [any Part] {
+  public extension NSImage {
+    var partsValue: [any Part] {
       guard let cgImage = cgImage(forProposedRect: nil, context: nil, hints: nil) else {
         return [ErrorPart(ImageConversionError.invalidUnderlyingImage)]
       }
@@ -63,13 +63,22 @@ enum ImageConversionError: Error {
       return [InlineDataPart(data: data, mimeType: "image/jpeg")]
     }
   }
-#endif
+
+  #if swift(>=6.2)
+    @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+    extension NSImage: PartsRepresentable {}
+  #else // swift(>=6.2)
+    @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+    extension NSImage: @unchecked @retroactive Sendable, PartsRepresentable {}
+  #endif
+
+#endif // canImport(UIKit)
 
 #if !os(watchOS) // This code does not build on watchOS.
   /// Enables `CGImages` to be representable as model content.
   @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
-  extension CGImage: PartsRepresentable {
-    public var partsValue: [any Part] {
+  public extension CGImage {
+    var partsValue: [any Part] {
       let output = NSMutableData()
       guard let imageDestination = CGImageDestinationCreateWithData(
         output, UTType.jpeg.identifier as CFString, 1, nil
@@ -86,13 +95,22 @@ enum ImageConversionError: Error {
       return [ErrorPart(ImageConversionError.couldNotConvertToJPEG)]
     }
   }
+
+  #if swift(>=6.1)
+    @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+    extension CGImage: PartsRepresentable {}
+  #else // swift(>=6.1)
+    @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+    extension CGImage: @unchecked @retroactive Sendable, PartsRepresentable {}
+  #endif // swift(>=6.1)
+
 #endif // !os(watchOS)
 
 #if canImport(CoreImage)
   /// Enables `CIImages` to be representable as model content.
   @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
-  extension CIImage: PartsRepresentable {
-    public var partsValue: [any Part] {
+  public extension CIImage {
+    var partsValue: [any Part] {
       let context = CIContext()
       let jpegData = (colorSpace ?? CGColorSpace(name: CGColorSpace.sRGB))
         .flatMap {
@@ -107,4 +125,13 @@ enum ImageConversionError: Error {
       return [ErrorPart(ImageConversionError.couldNotConvertToJPEG)]
     }
   }
+
+  #if swift(>=6.2)
+    @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+    extension CIImage: PartsRepresentable {}
+  #else // swift(>=6.2)
+    @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+    extension CIImage: @unchecked @retroactive Sendable, PartsRepresentable {}
+  #endif // swift(>=6.2)
+
 #endif // canImport(CoreImage)