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feat: add uvloop dependency with version markers for compatibility #6754

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feat: add uvloop dependency with version markers for compatibility #6754

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5 changes: 5 additions & 0 deletions pyproject.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,11 @@ dependencies = [
"rich >=13,<16",
"starlette >=1.3.1",
"typing_extensions >=4.13.0",
# Faster event loop, picked up automatically by granian (loop='auto') and uvicorn.
# Only where uvloop ships wheels (CPython on linux/macOS x86_64+arm64; 3.14 wheels
# start at 0.22.1) so installs never fall back to a source build.
"uvloop >=0.21.0; python_version < '3.14' and (sys_platform == 'linux' or sys_platform == 'darwin') and (platform_machine == 'x86_64' or platform_machine == 'aarch64' or platform_machine == 'arm64') and platform_python_implementation == 'CPython'",

@chatgpt-codex-connector chatgpt-codex-connector Bot Jul 13, 2026

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P2 Badge Keep uvloop opt-in for existing asyncio apps

On Linux/macOS CPython <3.14 this installs uvloop for every Reflex app. The existing Uvicorn paths (reflex/utils/exec.py::run_uvicorn_backend and prod) do not pass a loop= override, so Uvicorn's default auto switches those processes to uvloop as soon as the dependency is present. uvloop 0.22 raises RuntimeError from asyncio.get_event_loop() when no loop is already set, while the stdlib policy on Python 3.10–3.13 still creates one; apps or imported libraries that do this during module import/startup can fail before the backend serves. Please make uvloop opt-in or explicitly select it only where this compatibility change is acceptable.

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"uvloop >=0.22.1; python_version >= '3.14' and (sys_platform == 'linux' or sys_platform == 'darwin') and (platform_machine == 'x86_64' or platform_machine == 'aarch64' or platform_machine == 'arm64') and platform_python_implementation == 'CPython'",
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"wrapt >=1.17.0,<2.2",
"reflex-base >= 0.9.6",
"reflex-components-code >= 0.9.0",
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