宝玉 (@dotey) · 10/9/2026, 23:42:52
Deno Team Joins Cloudflare: Runtime Sunset in One Year, celld Enables Local Durable Objects for AI Agents
The Deno team has officially joined Cloudflare, marking the end of official maintenance for the Deno runtime in one year and the shutdown of Deno Deploy in six months. Ryan Dahl plans to integrate celld—an open-source Rust implementation of Workers and Durable Objects—into workerd, enabling developers to run stateful Workers applications on their own infrastructure, specifically targeting AI agents that require persistent connections and low-cost idle states.
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The Deno Team Joins Cloudflare; Deno Runtime Maintenance Ends in One Year, Deno Deploy Shuts Down in Six Months
The entire Deno team has joined Cloudflare. Over the next year, the Deno runtime will receive monthly releases focused exclusively on bug fixes and security patches, after which official development will cease. The hosting platform, Deno Deploy, will continue to operate for six months before shutting down.
Deno is a JavaScript runtime (an environment for executing JS code, similar to Node.js) created by Ryan Dahl, who is also the author of Node.js. Deno’s key selling points include default security enhancements, a comprehensive built-in toolchain, the ability to package applications into single executable files, and later, compatibility with the Node.js ecosystem. Deno Deploy was its companion cloud hosting service.
If you are currently using Deno, existing projects will continue to function normally in the short term, with security patches available for the next year. After one year, official maintenance will end. However, since the code remains open-source, community members willing to take over can continue development. For long-term projects, it is advisable to evaluate migration paths now.
Services deployed on Deno Deploy have six months to migrate. Paid users will receive migration support to move to Cloudflare Workers (Cloudflare’s serverless platform where functions run globally upon deployment), while free users must handle the migration themselves.
The JavaScript package registry, JSR, will continue operating, with its underlying infrastructure moving to Cloudflare. The Deno team will also continue maintaining rusty_v8 (a library for invoking the V8 engine from Rust) and integrate it into Cloudflare’s open-source runtime, workerd.
According to Dahl, building Deno Deploy revealed the complexity of underlying infrastructure, leading him to create celld. As described in the joint blog post with Cloudflare, celld is an open-source implementation of Workers and Durable Objects. Released in August this year, it is a single-file program written in Rust that depends only on an object storage bucket and can be deployed on your own servers.
Durable Objects are a programming model offered by Cloudflare. Each object acts as a small, single-threaded server with its own SQLite database, capable of directly handling WebSocket long connections. For example, a chat application can map each channel to a specific object. As user volume increases, the system automatically distributes load across more machines, eliminating the need for developers to build their own scaling architecture.
After joining Cloudflare, Dahl and Deno co-founder Bert Belder will merge celld’s code and concepts into workerd, making "running Workers applications on your own hardware" an officially supported use case. Currently, workerd’s Durable Objects support only single instances, which is sufficient for local testing but not for scaling. Once this integration is complete, this approach will work both on Cloudflare and in self-hosted data centers.
Dahl emphasizes AI agents as a critical direction. Agents require persistent state management, real-time connectivity, and cost efficiency during idle periods—capabilities that Durable Objects provide perfectly. In his article, he invites teams looking to scale agent operations on their own infrastructure to contact him directly.
↳ Quote @deno_land (Deno): We are excited to announce that Deno is joining Cloudflare!