Added Models.ipynb notebook for JavaScript

[Aarchi-07]

• Converted the existing Python notebook into a JavaScript implementation.
• Maintained the same logic, structure, and functionality as the original code.
• Improved code readability and consistency with JS best practices.

[gemini-code-assist]

Summary of Changes

Hello @Aarchi-07, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new JavaScript quickstart notebook, Models.txt, which is a direct translation of an existing Python notebook. The primary goal is to provide JavaScript developers with a clear guide on how to interact with the Gemini API to discover and inspect available models, including filtering by capabilities and retrieving detailed specifications like token limits. It also emphasizes secure API key management practices.

Highlights

• New JavaScript Quickstart Notebook: A new notebook, Models.txt, has been added to the quickstarts-js directory, providing a JavaScript implementation for interacting with the Gemini API.
• Python to JavaScript Conversion: The content of the new notebook is a direct conversion of an existing Python notebook, ensuring that the original logic, structure, and functionality are preserved while adhering to JavaScript best practices.
• Gemini API Model Management: The notebook demonstrates how to programmatically list all available Gemini API models, filter them based on supported actions (e.g., embedContent), and retrieve detailed information about specific models, including their input and output token limits.
• Secure API Key Configuration: Instructions and code examples are included for securely configuring the Gemini API key using environment variables, promoting best practices for sensitive information handling.

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[gemini-code-assist]

Code Review

This pull request adds a JavaScript version of the 'Models' notebook. The conversion is well-done and maintains the structure of the original. However, there are several areas for improvement regarding JavaScript best practices and API efficiency. Specifically, variables are declared in the global scope, the model list is fetched multiple times, and model lookup is done by iterating the full list instead of using a direct get method. I've left specific suggestions for these points. Additionally, as per the repository's style guide, the new notebook should be added to the quickstarts-js/README.md file to make it discoverable.

[gemini-code-assist]

Instead of fetching all models and iterating through them to find a specific one, it's more efficient to use the ai.models.get() method. This allows you to retrieve a model's details directly by its name.

const modelInfo = await ai.models.get("models/gemini-2.5-flash");
console.log(modelInfo);

[gemini-code-assist]

It's a good practice in JavaScript to declare variables with const or let to avoid polluting the global scope. I've updated the declarations to use const. Also, the MODEL_ID variable was declared but never used, so I've removed it to improve code clarity.

const module = await import("https://esm.sh/@google/[email protected]");
const GoogleGenAI = module.GoogleGenAI;
const ai = new GoogleGenAI({ apiKey: process.env.GEMINI_API_KEY });

[gemini-code-assist]

The ai.models.list() method is called multiple times in this notebook (here, and on lines 192 and 223). To improve performance and avoid redundant API calls, you should call this method once, store the result in a variable, and then reuse that variable throughout the notebook.