"The most complete example of what the new development server makes possible is support for Cloudflare Workers. With Astro 6 Beta, astro dev can now run applications using workerd, Cloudflare's open-source JavaScript runtime, which is the same runtime that powers Cloudflare Workers in production. This means developers can now develop directly against real platform APIs rather than simulations or polyfills."
"The new server leverages Vite's Environment API to run applications inside the same runtime as production, closing the gap between development and deployment environments. Previously, code that worked locally could behave differently once deployed, and platform-specific features often could not be tested until after deployment. By unifying the development and production code paths, the Astro team has already discovered and fixed numerous subtle bugs that existed only in development or only in production."
Astro 6 Beta ships a completely redesigned development server built on Vite's Environment API that runs applications inside the same runtime as production, reducing environment mismatches. The release adds first-class Cloudflare Workers support through workerd, enabling local development against Durable Objects, KV Namespaces, R2 Storage, Workers Analytics Engine, and environment variables with Hot Module Replacement. Stable live content collections enable real-time data updates, and built-in Content Security Policy support simplifies security headers. The release enforces Node 22+ and removes deprecated APIs, producing breaking changes that require dependency and code updates for many projects.
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