feat: add Pyodide support (#1456)

* feat: add Pyodide support

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>
Co-authored-by: Matthieu Darbois <mayeut@users.noreply.github.com>

tests: fix two merge issues

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

fix: include schema

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Try to fix xbuildenv path

[pre-commit.ci] auto fixes from pre-commit.com hooks

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Try to install pyodide-build from main branch

Try again

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Update constraints file

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Remove unused variable

Drop constraints

Remove --download option

Fix xbuildenv install

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* fix: remove pinning on pyodide

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Update for Pyodide 0.26.0a5

* Install pyodide-build from pypi

* Update docs/options.md

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

* Unxfail things that look like they were just a version mismatch

* refactor: add constraints for pyodide

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* chore: minor cleanup

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Apply suggestions from code review

* Apply suggestion from code review

* refactor: minor touchup

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* ci: xfail the pyodide test

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* review: use a pinned version of node

* fix tests

* review: error out on Windows

* test: check node & test on macos arm64

* chore: minor cleanup

* Add reference to emscripten libc issue

* Apply suggestion from code review

* review: use a pinned pip in test virtual environment

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* chore: rework test virtual environment seed packages

* chore: workaround direct invocation of pytest

This allows to still test direct invocation of `pytest` on most platforms (including pyodide on Linux) but falls back to `python -m pytest` when running pyodide on macOS.

* Use release version of pyodide

* fix: tests for 0.26.0 & parallel initialization of xbuildenv

* Debug CI

* fix: test/test_build_frontend_args.py

* Revert "Debug CI"

This reverts commit 917646cffc96dbfc619c47d1c03a828f447bcdb7.

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Matthieu Darbois <mayeut@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

cibuildwheel/__main__.py

@@ -15,6 +15,7 @@ from typing import Protocol
 import cibuildwheel
 import cibuildwheel.linux
 import cibuildwheel.macos
+import cibuildwheel.pyodide
 import cibuildwheel.util
 import cibuildwheel.windows
 from cibuildwheel._compat.typing import assert_never
@@ -45,7 +46,7 @@ def main() -> None:
 
     parser.add_argument(
         "--platform",
-        choices=["auto", "linux", "macos", "windows"],
+        choices=["auto", "linux", "macos", "windows", "pyodide"],
         default=None,
         help="""
             Platform to build for. Use this option to override the
@@ -176,6 +177,8 @@ def _compute_platform_only(only: str) -> PlatformName:
         return "macos"
     if "win_" in only or "win32" in only:
         return "windows"
+    if "pyodide_" in only:
+        return "pyodide"
     print(
         f"Invalid --only='{only}', must be a build selector with a known platform",
         file=sys.stderr,
@@ -246,11 +249,18 @@ def get_platform_module(platform: PlatformName) -> PlatformModule:
         return cibuildwheel.windows
     if platform == "macos":
         return cibuildwheel.macos
+    if platform == "pyodide":
+        return cibuildwheel.pyodide
     assert_never(platform)
 
 
 def build_in_directory(args: CommandLineArguments) -> None:
     platform: PlatformName = _compute_platform(args)
+    if platform == "pyodide" and sys.platform == "win32":
+        msg = "cibuildwheel: Building for pyodide is not supported on Windows"
+        print(msg, file=sys.stderr)
+        sys.exit(2)
+
     options = compute_options(platform=platform, command_line_arguments=args, env=os.environ)
 
     package_dir = options.globals.package_dir