Migrate to Vercel AI SDK v4.2 from v3.x

Author: glassBead-tc

.changeset/chatty-seas-pump.md

@@ -0,0 +1,5 @@
+---
+'@srcbook/api': patch
+---
+
+Migrate to Vercel AI SDK v4.2.

packages/api/ai/config.mts

@@ -70,5 +70,8 @@ export async function getModel(): Promise<LanguageModel> {
         baseURL: aiBaseUrl,
       });
       return openaiCompatible(model);
+      
+    default:
+      throw new Error(`Unsupported AI provider: ${aiProvider}`);
   }
-}
+}

packages/api/ai/generate.mts

@@ -138,7 +138,8 @@ ${query}
   return prompt;
 };
 
-type NoToolsGenerateTextResult = GenerateTextResult<{}>;
+// this might throw a compiler error, but that's fine: it's correct in Vercel AI SDK v4.x
+type NoToolsGenerateTextResult = GenerateTextResult<{}, {}>;
 /*
  * Given a user request, which is free form text describing their intent,
  * generate a srcbook using an LLM.
@@ -281,6 +282,7 @@ export async function streamEditApp(
       }
     },
     onFinish: () => {
+      // eslint-disable-next-line turbo/no-undeclared-env-vars
       if (process.env.SRCBOOK_DISABLE_ANALYTICS !== 'true') {
         logAppGeneration({
           appId,

packages/api/package.json

@@ -27,7 +27,7 @@
     "@ai-sdk/openai": "catalog:",
     "@ai-sdk/provider": "^1.0.1",
     "@srcbook/shared": "workspace:^",
-    "ai": "^3.4.33",
+    "ai": "^4.2.0",
     "archiver": "^7.0.1",
     "better-sqlite3": "^11.3.0",
     "cors": "^2.8.5",