v0.8.3 Pre-release thread

[adhami3310]

Please report any problems you encounter in this discussion thread or as separate issues on reflex-dev/reflex.

pip install 'reflex~=0.8.3a'

Schedule

2025-07-17 13:30 PDT: 0.8.3a1 pre-release published for testing
2025-07-18 10:25 PDT: 0.8.3a2 pre-release
2025-07-21: Planned Public release of 0.8.3

0.8.3a2

• add uv required version by @adhami3310 in add uv required version #5595
• remove timeout and simplify wait for server by @adhami3310 in remove timeout and simplify wait for server #5594

Release Notes

Disable stateless app detection

If you have a stateless app, now you need to explicitly set rx.App(enable_state=False) for it to be truly stateless.

• disable stateful app detection by @adhami3310 in disable stateful app detection #5583

reflex db status

A helpful command to visualize your migrations!

• Add db status command by @Lendemor in Add db status command #5560

Add rx.el.figure

I'm not sure why it was missing, but better late than never. https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/figure

• Add missing rx.el.figure HTML element by @devin-ai-integration[bot] in Add missing rx.el.figure HTML element #5575

AppHarness rewrote to use a separate process.

This drops Uvicorn as a testing dependency.

• Refactor AppHarness to use reflex run subprocess instead of threads by @devin-ai-integration[bot] in Refactor AppHarness to use reflex run subprocess instead of threads #5555

WindowEventListener

You can use rx.window_event_listener to add event handlers to the Window instance. For example:

rx.window_event_listener(on_key_down=rx.console_log)

would log key presses on the whole window. It also supports: on_resize, on_scroll, on_focus, on_blur, on_visibility_change, on_before_unload, on_key_down, on_popstate, and on_storage.

• add window_event_listener by @Lendemor in add window_event_listener #5568

Default event action flags in @rx.event

class State(rx.State):
    @event(throttle=500, stop_propagation=True)
    def handle_with_defaults(self):
        pass

It supports stop_propagation, prevent_default, throttle, debounce, and temporal.

• add event_action flags to rx.event decorator by @Lendemor in add event_action flags to rx.event decorator #5574
• fix docstring by @Lendemor in fix docstring #5592

Increase number of default workers in production

You can change the number of workers in production by setting the GRANIAN_WORKERS. If you don't, and you are using Redis, we set a higher value depending on the number of cores in your CPU.

• increase number of workers from the default one by @adhami3310 in increase number of workers from the default one #5586

Add useful information to frontend exceptions

Previously they only had the stack, which was not very helpful. Now they include the type and the message.

• add name and message to frontendend exception handler by @adhami3310 in add name and message to frontendend exception handler #5585

Bugfixes

• ENG-6695: Do not allow call_script EventSpec to accept callback after being called by @masenf in ENG-6695: Do not allow call_script EventSpec to accept callback after being called #5571
• fix attribute check for SQLAlchemy labeled column properties by @benedikt-bartscher in fix attribute check for SQLAlchemy labeled column properties #5567
• add message to why port is skipped by @adhami3310 in add message to why port is skipped #5584
• check input_type is a str before checking its type by @adhami3310 in check input_type is a str before checking its type #5587

Chores

• bump to 083 for dev by @adhami3310 in bump to 083 for dev #5572
• modify the contributing guide a tad bit to use uv run python -m reflex.utils.pyi_generator by @adhami3310 in modify the contributing guide a tad bit to use uv run python -m reflex.utils.pyi_generator #5576

Full Changelog: v0.8.2...release/reflex-0.8.3