Fix imports and types to solve test errors

Author: doc-code-hub

packages/chat/src/lib/classes/TextLineStream.ts

@@ -1,5 +1,7 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
+import { TransformStream } from "stream/web";
+
 interface TextLineStreamOptions {
     /** Allow splitting by solo \r */
     allowCR: boolean;

packages/chat/src/lib/doc-gpt-chat.ts

@@ -327,7 +327,7 @@ async function* readStreamAsEvents(stream: ReadableStream<Uint8Array>): AsyncGen
 async function* readStreamAsTextLines(stream: ReadableStream<Uint8Array>): AsyncGenerator<string> {
   const linesReader = stream
     .pipeThrough(new TextDecoderStream())
-    .pipeThrough(new TextLineStream())
+    .pipeThrough(new TextLineStream() as ReadableWritablePair<string | undefined, string>)
     .getReader();
   while (true) {
     const { value, done } = await linesReader.read();