feat: v1 — persistent shell, model gateway, artifact improvements (#1462)

lib/utils.ts

@@ -1,6 +1,4 @@
 import type {
-  AssistantModelMessage,
-  ToolModelMessage,
   UIMessage,
   UIMessagePart,
 } from 'ai';
@@ -48,13 +46,6 @@ export async function fetchWithErrorHandlers(
   }
 }
 
-export function getLocalStorage(key: string) {
-  if (typeof window !== 'undefined') {
-    return JSON.parse(localStorage.getItem(key) || '[]');
-  }
-  return [];
-}
-
 export function generateUUID(): string {
   return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
     const r = (Math.random() * 16) | 0;
@@ -63,14 +54,6 @@ export function generateUUID(): string {
   });
 }
 
-type ResponseMessageWithoutId = ToolModelMessage | AssistantModelMessage;
-type ResponseMessage = ResponseMessageWithoutId & { id: string };
-
-export function getMostRecentUserMessage(messages: UIMessage[]) {
-  const userMessages = messages.filter((message) => message.role === 'user');
-  return userMessages.at(-1);
-}
-
 export function getDocumentTimestampByIndex(
   documents: Document[],
   index: number,
@@ -81,18 +64,6 @@ export function getDocumentTimestampByIndex(
   return documents[index].createdAt;
 }
 
-export function getTrailingMessageId({
-  messages,
-}: {
-  messages: ResponseMessage[];
-}): string | null {
-  const trailingMessage = messages.at(-1);
-
-  if (!trailingMessage) { return null; }
-
-  return trailingMessage.id;
-}
-
 export function sanitizeText(text: string) {
   return text.replace('<has_function_call>', '');
 }