Reflex Changelog · Reflex Docs

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Reflex Changelog

Shared state updates now reach linked clients connected to other backend instances — the fan-out previously skipped any client whose websocket was not connected to the instance processing the event, so with redis and multiple workers only same-instance clients received live updates. ( #6934)
Allow static IDs on document-root head components without generating React hooks. ( #7005)

pip install reflex no longer installs pydantic; pydantic model support activates when it is installed. Use the new reflex[pydantic] extra (or reflex[db]) to keep it. ( #6786)
The compiled frontend now targets React Router 8.3.0 (from 7.18.2), and Reflex requires Node 22.22.0 or newer as a result. Apps on the default generated setup need no rxconfig.py or app code changes. One change is required if you wrote a custom component against react-router-dom: that package no longer exists upstream and is no longer installed, so library = "react-router-dom" must become react-router (or react-router/dom for RouterProvider/HydratedRouter). ( #6854)
A RegistrationContext can only be associated with a single App instance, so creating a second bare rx.App() in one process now raises ReflexRuntimeError (0.9.8 allowed it); use a fresh RegistrationContext (e.g. RegistrationContext.fork()) to create multiple apps. ( #6382)

Added content-hash cache busting to rx.asset URLs. ( #6550)
Add a preview run mode (reflex run --env preview) that hot reloads like dev but serves a freshly built, un-minified frontend bundle mounted into the backend instead of running the Vite dev server. Minification, CSS minification, autoprefixer, and sourcemaps are disabled by default for faster rebuilds and readable output (each overridable via VITE_MINIFY, REFLEX_NO_AUTOPREFIXER, and VITE_SOURCEMAP). ( #6663)
Support using mutable state proxies as async context managers. ( #6689)

Remove the per-update asyncio.create_task wrapper in EventNamespace.emit_update, cutting scheduling overhead roughly in half for every outgoing state update. ( #6734)
Speed up reading mutable state vars (lists, dicts, dataclasses) through MutableProxy. The per-element check that detects dataclasses.asdict/astuple recursion now reads frame.f_code.co_filename directly instead of calling inspect.getfile(), cutting proxy read overhead by roughly 3-4x on large containers without changing behavior. ( #6600)

Introduced towncrier-based changelog management. Each PR that changes package source now adds a fragment under the affected package's news/ directory; fragments are assembled into CHANGELOG.md at release time. See CONTRIBUTING.md for the full workflow. ( #6350)

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