errata

Author: dtauer

README.md

@@ -10,3 +10,39 @@ This repo is a companion to the [Build AI-Powered Apps with OpenAI and Node.js][
 ## Materials
 
 - [Course Notes](https://scottmoss.notion.site/AI-App-Node-js-f9a372a138ef4241943b4fbb44bdc970?pvs=4)
+
+
+## Errata
+
+**Document QA Query Function Lesson**
+
+A few of the Langchain methods used in this course have been deprecated. Here's an alternative approach:
+
+Install the Langchain community module
+
+```bash
+npm i @langchain/community
+````
+
+Import the loaders
+
+```javascript
+import { PDFLoader } from '@langchain/community/document_loaders/fs/pdf'
+import { YoutubeLoader } from '@langchain/community/document_loaders/web/youtube'
+```
+
+Create the loaders using the community methods:
+
+In `docsFromYTVideo`:
+
+```javascript
+const loader = YoutubeLoader.createFromUrl(video, { language: 'en', addVideoInfo: true, })
+return loader.load( new CharacterTextSplitter({ separator: ' ', chunkSize: 2500, chunkOverlap: 200, }) )
+```
+
+In `docsFromPDF`: 
+
+```javascript
+const docsFromPDF = async () => { const loader = new PDFLoader('./xbox.pdf')
+return loader.load( new CharacterTextSplitter({ separator: ' ', chunkSize: 2500, chunkOverlap: 200, }) ) }
+```