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feat: pyemscripten platform tag (PEP 783), 314.0a1, pyodide-eol flag, and maintenance updates (#2812)
* Use `pyodide config get emscripten_dir` * Update constraints * Updates for `pyemscripten` platform tag * Weird constraints stuff... * Revert "Weird constraints stuff..." This reverts commit 4bd785d. * Add some special constraints for pyodide * Wheel pyemscripten collision * Put delocate back in constraints (not needed tho) * Drop Pyodide 0.27.7 (cp312-pyodide_wasm32) * Add Pyodide 314.0.0a1 (cp314-pyodide_wasm32) * Delete no-longer-needed Pyodide 312 constraints * Update Pyodide 313 and 314 constraints * Add back prerelease stuff and update tests * Fix `test_pyodide_on_windows` * Update and fix tests some more * Also enable pyodide-prerelease in GHA sample build * Update tests yet again (`SINGLE_PYTHON_VERSION` changes) * Add a Pyodide-specific maintenance guide * Add suggestions from Hood and Gyeongjae Co-Authored-By: Hood Chatham <roberthoodchatham@gmail.com> Co-Authored-By: Gyeongjae Choi <def6488@gmail.com> * Add "Last updated: May 2026" to Pyodide document * Add a Pyodide EOL filter * Fix typo * Update maintenance docs about EoL Pyodide * Add Pyodide 312 constraints back * Update Pyodide 313 and 314 constraints * Remove "experimental" note about Pyodide * Remove another experimental Pyodide sentence * Add docs about the `pyodide-eol` enable option --------- Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com> Co-authored-by: Gyeongjae Choi <def6488@gmail.com> Co-authored-by: Henry Schreiner <henryfs@princeton.edu>
1 parent 542335f commit d2c0e59

20 files changed

Lines changed: 343 additions & 99 deletions

‎.github/workflows/test.yml‎

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@@ -321,11 +321,13 @@ jobs:
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output-dir: wheelhouse
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env:
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CIBW_PLATFORM: pyodide
324+
CIBW_ENABLE: pyodide-prerelease
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325326
- name: Run tests with 'CIBW_PLATFORM' set to 'pyodide'
326327
run: uv run --no-sync ./bin/run_tests.py
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env:
328329
CIBW_PLATFORM: pyodide
330+
CIBW_ENABLE: pyodide-prerelease
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test-uv-extras:
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name: Test uv extra on ${{ matrix.os }} ${{ matrix.test_select }}

‎cibuildwheel/platforms/pyodide.py‎

Lines changed: 10 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -94,29 +94,28 @@ def ensure_node(major_version: str) -> Path:
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return path
9595

9696

97-
def install_emscripten(
98-
env: dict[str, str], version: str, xbuildenv_cache_path: Path, pyodide_version: str
99-
) -> Path:
97+
def install_emscripten(env: dict[str, str], version: str, xbuildenv_cache_path: Path) -> Path:
10098
"""Install Emscripten via pyodide-build, which also applies Pyodide-specific patches."""
101-
emcc_path = (
102-
xbuildenv_cache_path / pyodide_version / "emsdk" / "upstream" / "emscripten" / "emcc"
99+
emscripten_dir = Path(
100+
call("pyodide", "config", "get", "emscripten_dir", env=env, capture_stdout=True).strip()
103101
)
104102
with FileLock(CIBW_CACHE_PATH / "emscripten.lock"):
105-
if emcc_path.exists():
106-
return emcc_path
103+
if emscripten_dir.exists():
104+
return emscripten_dir
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call(
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"pyodide",
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"xbuildenv",
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"install-emscripten",
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"--force",
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"--version",
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version,
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"--path",
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str(xbuildenv_cache_path),
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env=env,
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cwd=CIBW_CACHE_PATH,
117116
)
118-
assert emcc_path.exists()
119-
return emcc_path
117+
assert emscripten_dir.exists()
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return emscripten_dir
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122121
def get_all_xbuildenv_version_info(env: dict[str, str]) -> list[PyodideXBuildEnvInfo]:
@@ -315,9 +314,9 @@ def setup_python(
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log.step(
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f"Installing Emscripten {emscripten_version} and applying Pyodide-specific patches ..."
317316
)
318-
emcc_path = install_emscripten(env, emscripten_version, xbuildenv_cache_path, pyodide_version)
317+
emscripten_dir = install_emscripten(env, emscripten_version, xbuildenv_cache_path)
319318

320-
env["PATH"] = os.pathsep.join([str(emcc_path.parent), env["PATH"]])
319+
env["PATH"] = os.pathsep.join([str(emscripten_dir), env["PATH"]])
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322321
return env
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‎cibuildwheel/resources/build-platforms.toml‎

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Original file line numberDiff line numberDiff line change
@@ -206,7 +206,8 @@ python_configurations = [
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[pyodide]
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python_configurations = [
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{ identifier = "cp312-pyodide_wasm32", version = "3.12", default_pyodide_version = "0.27.7", node_version = "v22" },
209-
{ identifier = "cp313-pyodide_wasm32", version = "3.13", default_pyodide_version = "0.29.3", node_version = "v22" },
209+
{ identifier = "cp313-pyodide_wasm32", version = "3.13", default_pyodide_version = "0.29.4", node_version = "v22" },
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{ identifier = "cp314-pyodide_wasm32", version = "3.14", default_pyodide_version = "314.0.0a1", node_version = "v24" },
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]
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[android]

‎cibuildwheel/resources/constraints-pyodide312.txt‎

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@@ -2,15 +2,15 @@
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# nox -s update_constraints
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annotated-types==0.7.0
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# via pydantic
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auditwheel-emscripten==0.2.3
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auditwheel-emscripten==0.2.4
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# via pyodide-build
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build==1.2.2.post1
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build==1.5.0
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# via
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# -r .nox/update_constraints/tmp/constraints-pyodide.in
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# pyodide-build
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certifi==2026.2.25
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certifi==2026.4.22
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# via requests
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charset-normalizer==3.4.6
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charset-normalizer==3.4.7
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# via requests
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click==8.1.8
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# via
@@ -19,54 +19,54 @@ click==8.1.8
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# pyodide-cli
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distlib==0.4.0
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# via virtualenv
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filelock==3.25.2
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filelock==3.29.0
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# via
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# python-discovery
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# virtualenv
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idna==3.11
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idna==3.13
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# via requests
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leb128==1.0.9
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# via auditwheel-emscripten
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markdown-it-py==4.0.0
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markdown-it-py==4.2.0
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# via rich
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mdurl==0.1.2
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# via markdown-it-py
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packaging==26.0
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packaging==26.2
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# via
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# auditwheel-emscripten
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# build
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# pyodide-build
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# wheel
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pip==26.0.1
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pip==26.1.1
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# via -r .nox/update_constraints/tmp/constraints-pyodide.in
42-
platformdirs==4.9.4
42+
platformdirs==4.9.6
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# via
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# pyodide-build
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# python-discovery
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# virtualenv
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pydantic==2.12.5
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pydantic==2.13.4
4848
# via
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# pyodide-build
5050
# pyodide-lock
51-
pydantic-core==2.41.5
51+
pydantic-core==2.46.4
5252
# via pydantic
53-
pygments==2.19.2
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pygments==2.20.0
5454
# via rich
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pyodide-build==0.33.0
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pyodide-build==0.34.3
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# via -r .nox/update_constraints/tmp/constraints-pyodide.in
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pyodide-cli==0.5.0
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# via
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# auditwheel-emscripten
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# pyodide-build
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pyodide-lock==0.1.2
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pyodide-lock==0.1.3
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# via pyodide-build
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pyproject-hooks==1.2.0
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# via build
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python-discovery==1.2.0
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python-discovery==1.3.0
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# via virtualenv
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requests==2.32.5
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requests==2.33.1
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# via pyodide-build
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rich==14.3.3
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rich==15.0.0
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# via
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# pyodide-build
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# pyodide-cli
@@ -81,11 +81,11 @@ typing-inspection==0.4.2
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# via pydantic
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urllib3==2.6.3
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# via requests
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virtualenv==21.2.0
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virtualenv==21.3.1
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# via
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# build
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# pyodide-build
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wheel==0.46.3
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wheel==0.47.0
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# via
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# auditwheel-emscripten
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# pyodide-build

‎cibuildwheel/resources/constraints-pyodide313.txt‎

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# nox -s update_constraints
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annotated-types==0.7.0
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# via pydantic
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auditwheel-emscripten==0.2.3
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auditwheel-emscripten==0.2.4
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# via pyodide-build
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build==1.2.2.post1
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build==1.5.0
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# via
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# -r .nox/update_constraints/tmp/constraints-pyodide.in
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# pyodide-build
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certifi==2026.2.25
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certifi==2026.4.22
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# via requests
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charset-normalizer==3.4.6
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charset-normalizer==3.4.7
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# via requests
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click==8.1.8
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# via
@@ -19,54 +19,54 @@ click==8.1.8
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# pyodide-cli
2020
distlib==0.4.0
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# via virtualenv
22-
filelock==3.25.2
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filelock==3.29.0
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# via
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# python-discovery
2525
# virtualenv
26-
idna==3.11
26+
idna==3.13
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# via requests
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leb128==1.0.9
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# via auditwheel-emscripten
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markdown-it-py==4.0.0
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markdown-it-py==4.2.0
3131
# via rich
3232
mdurl==0.1.2
3333
# via markdown-it-py
34-
packaging==26.0
34+
packaging==26.2
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# via
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# auditwheel-emscripten
3737
# build
3838
# pyodide-build
3939
# wheel
40-
pip==26.0.1
40+
pip==26.1.1
4141
# via -r .nox/update_constraints/tmp/constraints-pyodide.in
42-
platformdirs==4.9.4
42+
platformdirs==4.9.6
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# via
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# pyodide-build
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# python-discovery
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# virtualenv
47-
pydantic==2.12.5
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pydantic==2.13.4
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# via
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# pyodide-build
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# pyodide-lock
51-
pydantic-core==2.41.5
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pydantic-core==2.46.4
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# via pydantic
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pygments==2.19.2
53+
pygments==2.20.0
5454
# via rich
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pyodide-build==0.33.0
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pyodide-build==0.34.3
5656
# via -r .nox/update_constraints/tmp/constraints-pyodide.in
5757
pyodide-cli==0.5.0
5858
# via
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# auditwheel-emscripten
6060
# pyodide-build
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pyodide-lock==0.1.2
61+
pyodide-lock==0.1.3
6262
# via pyodide-build
6363
pyproject-hooks==1.2.0
6464
# via build
65-
python-discovery==1.2.0
65+
python-discovery==1.3.0
6666
# via virtualenv
67-
requests==2.32.5
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requests==2.33.1
6868
# via pyodide-build
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rich==14.3.3
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rich==15.0.0
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# via
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# pyodide-build
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# pyodide-cli
@@ -81,11 +81,11 @@ typing-inspection==0.4.2
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# via pydantic
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urllib3==2.6.3
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# via requests
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virtualenv==21.2.0
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virtualenv==21.3.1
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# via
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# build
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# pyodide-build
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wheel==0.46.3
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wheel==0.47.0
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# via
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# auditwheel-emscripten
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# pyodide-build

‎cibuildwheel/resources/constraints-pyodide314.txt‎

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Original file line numberDiff line numberDiff line change
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# This file was autogenerated by uv via the following command:
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# nox -s update_constraints
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annotated-types==0.7.0
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# via pydantic
5+
auditwheel-emscripten==0.2.4
6+
# via pyodide-build
7+
build==1.5.0
8+
# via
9+
# -r .nox/update_constraints/tmp/constraints-pyodide.in
10+
# pyodide-build
11+
certifi==2026.4.22
12+
# via requests
13+
charset-normalizer==3.4.7
14+
# via requests
15+
click==8.1.8
16+
# via
17+
# -r .nox/update_constraints/tmp/constraints-pyodide.in
18+
# pyodide-build
19+
# pyodide-cli
20+
distlib==0.4.0
21+
# via virtualenv
22+
filelock==3.29.0
23+
# via
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# python-discovery
25+
# virtualenv
26+
idna==3.13
27+
# via requests
28+
leb128==1.0.9
29+
# via auditwheel-emscripten
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markdown-it-py==4.2.0
31+
# via rich
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mdurl==0.1.2
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# via markdown-it-py
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packaging==26.2
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# via
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# auditwheel-emscripten
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# build
38+
# pyodide-build
39+
# wheel
40+
pip==26.1.1
41+
# via -r .nox/update_constraints/tmp/constraints-pyodide.in
42+
platformdirs==4.9.6
43+
# via
44+
# pyodide-build
45+
# python-discovery
46+
# virtualenv
47+
pydantic==2.13.4
48+
# via
49+
# pyodide-build
50+
# pyodide-lock
51+
pydantic-core==2.46.4
52+
# via pydantic
53+
pygments==2.20.0
54+
# via rich
55+
pyodide-build==0.34.3
56+
# via -r .nox/update_constraints/tmp/constraints-pyodide.in
57+
pyodide-cli==0.5.0
58+
# via
59+
# auditwheel-emscripten
60+
# pyodide-build
61+
pyodide-lock==0.1.3
62+
# via pyodide-build
63+
pyproject-hooks==1.2.0
64+
# via build
65+
python-discovery==1.3.0
66+
# via virtualenv
67+
requests==2.33.1
68+
# via pyodide-build
69+
rich==15.0.0
70+
# via
71+
# pyodide-build
72+
# pyodide-cli
73+
ruamel-yaml==0.19.1
74+
# via pyodide-build
75+
typing-extensions==4.15.0
76+
# via
77+
# pydantic
78+
# pydantic-core
79+
# typing-inspection
80+
typing-inspection==0.4.2
81+
# via pydantic
82+
urllib3==2.6.3
83+
# via requests
84+
virtualenv==21.3.1
85+
# via
86+
# build
87+
# pyodide-build
88+
wheel==0.47.0
89+
# via
90+
# auditwheel-emscripten
91+
# pyodide-build

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