Update integrating-generative-apis-with-popular-tools.mdx

Add snippets example to configure Langchain client using Typescript.

Author: fpagny

pages/generative-apis/reference-content/integrating-generative-apis-with-popular-tools.mdx

@@ -67,10 +67,60 @@ print(response.choices[0].message.content)
 
 LangChain is a popular library for building AI applications. Scaleway's Generative APIs support LangChain for both inference and embeddings.
 
+### Python
 <Message type="tip">
   Refer to our dedicated documentation for [implementing Retrieval-Augmented Generation (RAG) with LangChain and Scaleway Generative APIs](/tutorials/how-to-implement-rag-generativeapis/)
 </Message>
 
+### Javascript (Typescript)
+
+To perform chat conversations with langchain, first install `langchain` and `@langchain/openai` packages using your node package manager. Here is the example with `npm` (`yarn` and `pnpm` are also available):
+```bash
+npm install langchain @langchain/openai
+```
+
+Then, edit your `package.json` file to ensure it has `"type": "module"` property:
+```json
+{
+  "type": "module",
+  "dependencies": {
+    "@langchain/openai": "^0.4.4",
+    "langchain": "^0.3.19"
+  }
+}
+```
+
+Create a `main.js` file and add the following content to it:
+```js
+import { ChatOpenAI } from "@langchain/openai";
+
+const chat = new ChatOpenAI({
+    apiKey: "<API secret key>",
+    model: "llama-3.1-8b-instruct",
+    configuration: {
+        baseURL: "https://api.scaleway.ai/v1",
+    }
+  });
+
+const response = await chat.invoke("Tell me a joke");
+console.log(response.content);
+```
+
+<Message type="tip">
+  Make sure to replace `<API secret key>` with your actual API key.
+</Message>
+
+Run `main.js`:
+```bash
+node main.js
+```
+The model answer should display:
+```bash
+Why couldn't the bicycle stand up by itself? Because it was two-tired.
+```
+
+Note that other Langchain objects from OpenAI client library are also compatible, such as `OpenAI` and `OpenAIEmbeddings`.
+
 ## Continue Dev (AI coding assistance)
 
 Continue Dev is a library that provides AI-powered coding assistance. Scaleway's Generative APIs support Continue Dev for code completion and more.