feat: add typing effect (#1017)

* feat: add typing effect

* fix: ts2339 xxx not exist on type 'never'

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Co-authored-by: WangYi <wangyi@windimg.com>

service/src/index.ts

@@ -25,7 +25,7 @@ router.post('/chat-process', [auth, limiter], async (req, res) => {
   try {
     const { prompt, options = {}, systemMessage } = req.body as RequestProps
     let firstChunk = true
-    await chatReplyProcess({
+    const finalResponse = await chatReplyProcess({
       message: prompt,
       lastContext: options,
       process: (chat: ChatMessage) => {
@@ -34,6 +34,7 @@ router.post('/chat-process', [auth, limiter], async (req, res) => {
       },
       systemMessage,
     })
+    res.write(firstChunk ? JSON.stringify(finalResponse) : `\n${JSON.stringify(finalResponse)}`)
   }
   catch (error) {
     res.write(JSON.stringify(error))