port lazy_loader perf and native PEP810 + add python3.15 support

[benedikt-bartscher]

scientific-python/lazy-loader#172
scientific-python/lazy-loader#173

[codspeed-hq]

Merging this PR will improve performance by 4.72%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 5 improved benchmarks
✅ 22 untouched benchmarks
⏩ 8 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	test_evaluate_page[_complicated_page]	27.3 ms	25.9 ms	+5.49%
⚡	Simulation	test_evaluate_page_with_hooks[_complicated_page]	27.6 ms	26.1 ms	+5.44%
⚡	Simulation	test_evaluate_page[_stateful_page]	4.5 ms	4.3 ms	+4.81%
⚡	Simulation	test_evaluate_page_with_hooks[_stateful_page]	4.7 ms	4.5 ms	+4.45%
⚡	Simulation	test_console_log	373.7 µs	361.3 µs	+3.44%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing benedikt-bartscher:use-lazy-loader-branch (79217a1) with main (f35b493)}

Footnotes

1. 8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[greptile-apps]

Greptile Summary

The PR adds Python 3.15 support and ports native and cached lazy-loading behavior.

• Adds Python 3.15 jobs to unit and integration CI matrices and adjusts dependencies lacking CPython 3.15 wheels.
• Uses native PEP 810 lazy imports on Python 3.15 while caching resolved attributes on earlier interpreters.
• Replaces removed private dataclasses typing references and handles PEP 728 TypedDict sentinels.
• Adds Python 3.15-specific test accommodations for current dill limitations.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
packages/reflex-base/src/reflex_base/utils/lazy_loader.py	Adds validated native lazy-import bindings for Python 3.15 and caches attributes resolved by the classic loader.
packages/reflex-base/src/reflex_base/utils/compat.py	Introduces a public-sentinel-derived replacement for the private dataclasses missing-value type removed in Python 3.15.
packages/reflex-base/src/reflex_base/utils/types.py	Normalizes PEP 728 NoExtraItems sentinels when validating TypedDict values.
packages/reflex-base/src/reflex_base/components/component.py	Migrates component-field annotations from the removed private dataclasses type to the compatibility alias.
packages/reflex-base/src/reflex_base/vars/base.py	Migrates state-field annotations to the Python 3.15-compatible missing-value type alias.
pyproject.toml	Uses pure-Python psycopg on Python 3.15 where psycopg-binary wheels are not yet available.
.github/workflows/unit_tests.yml	Extends the cross-platform unit-test matrix to Python 3.15.
.github/workflows/integration_app_harness.yml	Extends integration and Playwright matrices to Python 3.15.

_{Reviews (10): Last reviewed commit: "Merge branch 'main' into use-lazy-loader..." | Re-trigger Greptile}

[cubic-dev-ai]

All reported issues were addressed across 17 files

<sub>Reply with feedback, questions, or to request a fix.

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