From 7ed296b769d4c976053a99da6853e32f59044435 Mon Sep 17 00:00:00 2001
From: Simon Farshid <simon.farshid@outlook.com>
Date: Mon, 9 Sep 2024 10:41:54 -0700
Subject: [PATCH] fix: make AppendMessage attachments field optional for now
 (#797)

---
 .changeset/four-cars-deliver.md                       | 5 +++++
 packages/react-ai-sdk/src/ui/utils/toCreateMessage.ts | 2 +-
 packages/react/src/types/AssistantTypes.ts            | 3 ++-
 3 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/four-cars-deliver.md

diff --git a/.changeset/four-cars-deliver.md b/.changeset/four-cars-deliver.md
new file mode 100644
index 000000000..bdef212d2
--- /dev/null
+++ b/.changeset/four-cars-deliver.md
@@ -0,0 +1,5 @@
+---
+"@assistant-ui/react": patch
+---
+
+fix: make AppendMessage attachments field optional for now
diff --git a/packages/react-ai-sdk/src/ui/utils/toCreateMessage.ts b/packages/react-ai-sdk/src/ui/utils/toCreateMessage.ts
index e9be5efbc..1f5714657 100644
--- a/packages/react-ai-sdk/src/ui/utils/toCreateMessage.ts
+++ b/packages/react-ai-sdk/src/ui/utils/toCreateMessage.ts
@@ -19,7 +19,7 @@ export const toCreateMessage = async (
     experimental_attachments: [
       ...images,
       ...(await Promise.all(
-        message.attachments.map(async (m) => {
+        (message.attachments ?? []).map(async (m) => {
           if (m.file == null)
             throw new Error("Attachment did not contain a file");
           return {
diff --git a/packages/react/src/types/AssistantTypes.ts b/packages/react/src/types/AssistantTypes.ts
index 3167181f0..7b51adc93 100644
--- a/packages/react/src/types/AssistantTypes.ts
+++ b/packages/react/src/types/AssistantTypes.ts
@@ -133,7 +133,8 @@ export type ThreadAssistantMessage = MessageCommonProps & {
 
 export type AppendMessage = CoreMessage & {
   parentId: string | null;
-  attachments: readonly MessageAttachment[];
+  // TODO make required in the next major version
+  attachments?: readonly MessageAttachment[];
 };
 
 export type ThreadMessage =