Cloudflare and Deno announced October 9 that the Deno team is joining Cloudflare. Ryan Dahl and Kenton Varda describe a plan to make the Workers programming model easier to run on infrastructure outside Cloudflare. This is an engineering direction and team announcement, not confirmation that every planned integration is already finished.
The plan brings together workerd, the open-source Cloudflare Workers runtime, and celld, the Deno team's self-hosted implementation. The announcement says Ryan Dahl and Bert Belder will lead an effort to make workerd self-hosting a first-class supported option.
Varda identifies a specific limitation in workerd: its Durable Objects implementation works in a single instance, suitable for local testing, rather than scaling across instances. Cloudflare's own production routing implementation has dependencies designed for its network, and is not simply a ready-made self-hosting system.
Deno's separate October 9 post says its runtime will receive monthly bug-fix and security releases for another year, after which Deno will end its development of the runtime. It will remain open source. The post says Deno Deploy will operate for six months before shutting down, with migration support for paying customers moving to Cloudflare Workers.
Deno says JSR will keep operating with its infrastructure moving to Cloudflare, and that rusty_v8 support will continue. Separately, the joint announcement plans to merge code and ideas from celld into workerd, with more announcements in coming months. Existing self-hosting options should not be confused with a completed merged implementation.
Limits: the cited announcement does not establish a completed migration for current customers, universal compatibility with other cloud platforms, a delivery deadline or an independent cost comparison. Its claims about the programming model being better are company opinions. The concrete development is the team joining and a stated plan to improve distributed self-hosting.