v0.8.9 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~=0.8.9a'

Schedule

2025-08-28 18:00 PDT: 0.8.9a1 pre-release published for testing
2025-09-01: Planned Public release of 0.8.9

Release Notes

Deprecate state_auto_setters being defaulted to True.

In 0.9.0 this option will default to False. Set it to True if you want to use set_ pattern, or implement setters explicitly.

• deprecate state_auto_setters=True by @adhami3310 in deprecate state_auto_setters=True #5739

Option to disable Vite's Hot-Module-Reload

In case you are getting "No module update found for route", you can force full page reload on updates by setting the environment variable VITE_FORCE_FULL_RELOAD to 1. In case you want to disable the reload completely (so refreshing manually to update the page), you can set VITE_HMR to 0.

• add option to disable hmr by @adhami3310 in add option to disable hmr #5745

ImportVar(tag="*", is_default=True, alias='Alias) works as expected now

It renders to:

import * as Alias from '...'

• handle star imports for alias by @adhami3310 in handle star imports for alias #5743

Wrap additional SVG elements.

Those include: Polyline, SvgImage, Use, TSpan, TextPath, Pattern, ClipPath, Symbol, Mask, ForeignObject, SvgA, Animate, AnimateMotion, AnimateTransform, Set, MPath, Desc, Title, Metadata, Script, SvgStyle, Switch, View

• add few missing svg elements by @adhami3310 in add few missing svg elements #5742

Performance optimizations

Some cleanups in particularly offending functions. It doesn't affect most things but it does improve things by a bit.

• optimize various functions by @adhami3310 in optimize various functions #5744

Serialize Memo components as Vars

You can use memo components as Vars of type=type[Component].

• allow memo components to be passed to props by @adhami3310 in allow memo components to be passed to props #5178

Chores

• 089dev by @adhami3310 in 089dev #5736

Full Changelog: v0.8.8...release/reflex-0.8.9

[bertbarabas]

I'm getting an exception on a line subclassing rx.State during reflex run. I went back to 0.8.8 and reflex run has no problems...

Traceback (most recent call last):
  File "/usr/lib/python3.12/concurrent/futures/process.py", line 263, in _process_worker
    r = call_item.fn(*call_item.args, **call_item.kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/utils/prerequisites.py", line 285, in compile_or_validate_app
    get_compiled_app(
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/utils/prerequisites.py", line 265, in get_compiled_app
    app, app_module = get_and_validate_app(
                      ^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/utils/prerequisites.py", line 234, in get_and_validate_app
    app_module = get_app(reload=reload)
                 ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/utils/prerequisites.py", line 195, in get_app
    __import__(module, fromlist=(constants.CompileVars.APP,))
  File "/home/ubuntu/projects/hoa-arc/hoa_arc/hoa_arc.py", line 4, in <module>
    from hoa_arc.console import console
  File "/home/ubuntu/projects/hoa-arc/hoa_arc/console.py", line 3, in <module>
    from hoa_arc.application_list import (
  File "/home/ubuntu/projects/hoa-arc/hoa_arc/application_list.py", line 6, in <module>
    from hoa_arc.arc_roof_application_state import ApplicationState
  File "/home/ubuntu/projects/hoa-arc/hoa_arc/arc_roof_application_state.py", line 93, in <module>
    class ApplicationState(rx.State):
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/vars/base.py", line 3670, in __new__
    return super().__new__(cls, name, bases, namespace)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen abc>", line 106, in __new__
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/state.py", line 565, in __init_subclass__
    cls._init_var(name, prop)
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/state.py", line 1042, in _init_var
    if not types.is_valid_var_type(prop._var_type):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/projects/hoa-arc/.venv/lib/python3.12/site-packages/reflex/utils/types.py", line 863, in is_valid_var_type
    issubclass(type_, StateVarTypes)
TypeError: issubclass() arg 1 must be a class

[adhami3310]

would you happen to know what type_ is? you can add a debug log in is_valid_var_type printing that

[bertbarabas]

typing.Literal

My state def starts like this:

class ApplicationState(rx.State):
    application_in_process: Literal["None", "Roof"] = "None"