From 090f714c97adfc4886c053b79a3a1769e54220de Mon Sep 17 00:00:00 2001
From: bracesproul <braceasproul@gmail.com>
Date: Mon, 29 Jul 2024 09:08:46 -0700
Subject: [PATCH] core[patch]: Parse text delta content fields in
 StringOutputParser

---
 langchain-core/src/output_parsers/string.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/langchain-core/src/output_parsers/string.ts b/langchain-core/src/output_parsers/string.ts
index 59476cd9baa7..41a30fba50c8 100644
--- a/langchain-core/src/output_parsers/string.ts
+++ b/langchain-core/src/output_parsers/string.ts
@@ -63,6 +63,7 @@ export class StringOutputParser extends BaseTransformOutputParser<string> {
   ): string {
     switch (content.type) {
       case "text":
+      case "text_delta":
         if ("text" in content) {
           // Type guard for MessageContentText
           return this._textContentToString(content as MessageContentText);