IT-INFO

1. Comprehensive npm Compatibility

One of the most groundbreaking features of Deno 2.0 is its full npm compatibility. This allows developers to use npm packages directly in Deno projects without any additional tools or configurations.

// Using an npm package in Deno
import express from "npm:express@4.18.2";
import { createClient } from "npm:@supabase/supabase-js";

const app = express();
app.get("/", (req, res) => {
  res.send("Hello from Deno using Express!");
});

app.listen(3000);
        

This feature bridges the gap between Deno and the vast npm ecosystem, making it easier for developers to transition to Deno and leverage existing JavaScript libraries.

2. Enhanced Performance

Deno 2.0 boasts significant performance improvements:

• Up to 5x faster HTTP server performance
• 2x faster TypeScript type checking
• Improved startup times, particularly noticeable for TypeScript projects

These enhancements make Deno more competitive with other runtimes and suitable for high-performance applications.

3. Stabilized APIs

Several APIs have been stabilized in this release, including:

• WebGPU API for hardware-accelerated graphics
• Foreign Function Interface (FFI) for interacting with native libraries
• Deno.serve API for creating HTTP servers

// Using the stable Deno.serve API
Deno.serve(() => new Response("Hello, World!"));
        

4. Improved Developer Experience

Deno 2.0 introduces several features to enhance the developer experience:

• New deno add command for easy package installation
• Automatic import map generation
• Enhanced VS Code integration
• Improved error messages and debugging capabilities
• New task runner feature for defining and running custom scripts in deno.json

5. Security Enhancements

While maintaining its security-first approach, Deno 2.0 introduces more granular permissions and improved security prompts, making it easier for developers to manage and understand the permissions their applications require.

A notable addition is the new --allow-sys flag for more granular system-level permissions.

6. Looking Ahead: Deno Deploy

The Deno team also announced upcoming features for Deno Deploy, including:

• Support for npm packages in Deno Deploy
• Deno KV: a built-in key-value store
• Cron jobs and scheduled functions
• Improved compatibility between local Deno projects and Deno Deploy, aiming for a seamless transition

These features will further enhance Deno's capabilities in serverless and edge computing scenarios.

Conclusion

Deno 2.0 represents a significant leap forward in JavaScript and TypeScript development. With its improved npm compatibility, enhanced performance, and developer-friendly features, it offers a compelling environment for modern web development. Whether you're building server-side applications, command-line tools, or exploring cutting-edge web technologies, Deno 2.0 provides a powerful and user-friendly platform to bring your ideas to life.