feat: add fromCoreMessages converter (#477)

packages/react/src/runtimes/edge/EdgeChatAdapter.ts

@@ -1,6 +1,6 @@
 import { ChatModelAdapter, ChatModelRunOptions } from "../local";
 import { ChatModelRunResult } from "../local/ChatModelAdapter";
-import { toCoreMessage } from "./converters/toCoreMessage";
+import { toCoreMessages } from "./converters/toCoreMessages";
 import { toLanguageModelTools } from "./converters/toLanguageModelTools";
 import { EdgeRuntimeRequestOptions } from "./EdgeRuntimeRequestOptions";
 import { assistantDecoderStream } from "./streams/assistantDecoderStream";
@@ -38,7 +38,7 @@ export class EdgeChatAdapter implements ChatModelAdapter {
       },
       body: JSON.stringify({
         system: config.system,
-        messages: messages.map(toCoreMessage),
+        messages: toCoreMessages(messages),
         tools: toLanguageModelTools(
           config.tools,
         ) as EdgeRuntimeRequestOptions["tools"],

packages/react/src/runtimes/edge/converters/fromCoreMessage.ts

@@ -0,0 +1,17 @@
+import { generateId } from "../../../internal";
+import { ThreadMessage, CoreMessage } from "../../../types";
+
+export const fromCoreMessages = (message: CoreMessage[]): ThreadMessage[] => {
+  return message.map((message) => {
+    return {
+      ...message,
+      id: generateId(),
+      createdAt: new Date(),
+      ...(message.role === "assistant"
+        ? {
+            status: { type: "done" },
+          }
+        : undefined),
+    } as ThreadMessage;
+  });
+};

packages/react/src/runtimes/edge/converters/toCoreMessages.ts

@@ -0,0 +1,13 @@
+import { ThreadMessage, CoreMessage } from "../../../types";
+
+export const toCoreMessages = (message: ThreadMessage[]): CoreMessage[] => {
+  return message.map((message) => {
+    return {
+      role: message.role,
+      content: message.content.map((part) => {
+        if (part.type === "ui") throw new Error("UI parts are not supported");
+        return part;
+      }),
+    } as CoreMessage;
+  });
+};

packages/react/src/runtimes/edge/converters/toLanguageModelMessages.ts

@@ -69,7 +69,7 @@ const assistantMessageSplitter = () => {
 };
 
 export function toLanguageModelMessages(
-  message: CoreMessage[] | ThreadMessage[],
+  message: readonly CoreMessage[] | readonly ThreadMessage[],
 ): LanguageModelV1Message[] {
   return message.flatMap((message) => {
     const role = message.role;

packages/react/src/runtimes/edge/index.ts

@@ -4,4 +4,4 @@ export type { EdgeRuntimeOptions } from "./EdgeChatAdapter";
 
 export { toLanguageModelMessages } from "./converters/toLanguageModelMessages";
 export { fromLanguageModelMessages } from "./converters/fromLanguageModelMessages";
-export { toCoreMessage } from "./converters/toCoreMessage";
+export { fromCoreMessages } from "./converters/fromCoreMessage";