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Fitz Framework Achieves Isomorphic Hydration with WASM Client Adopting Server-Rendered DOM

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Fitz, a web framework, has implemented isomorphic hydration that allows a WebAssembly client to take over a server-rendered DOM without rebuilding it from scratch. Developers mark components with a hydrate flag, enabling the WASM client to walk the existing DOM node-by-node, restore serialized state, and wire up event listeners without clearing or recreating any elements. Unlike React or Next.js, Fitz ships no JavaScript framework runtime to the client, relying instead on a single compiled WASM binary that adopts the exact nodes painted by the server. The approach has been verified end-to-end in a real Chrome browser via Puppeteer, confirming that server state is preserved and in-place DOM patching works correctly after hydration. The team notes that complex state types not compatible with JSON round-tripping gracefully fall back to defaults, and broader features like universal auto-hydration and dynamic slot composition are planned for future releases.

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