[Libba Lawrence (l0lawrence)]

Fix Python playground Failed to fetch errors by publishing dependencies with the emitter instead of resolving them from PyPI in the browser.

• Prepare browser-compatible wheels from CFS only for playground publication; ordinary builds skip this step.
• Install public wheel assets and matching Pyodide packages without package-index lookups. Generation stays in the browser, with no company-network access required.

** When running the script for the playground we pull the dependencies down from the CFS feed and bundle them. Non-playground uses of the emitter should not be impacted. We pull all dependencies of the emitter with the exception of pyYAML and MarkupSafe which are vendored by pyodide already

[azure-sdk-automation]

You can try these changes here

🛝 Playground	🌐 Website	🛝 VSCode Extension

[Copilot]

Warning

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Copilot review overview

3 open issues

• manifest is typed as unknown, but the code accesses manifest.wheels directly. In TypeScript,… · New
• next(dist.glob('pygen-*.whl')) will raise StopIteration if the wheel isn't present, which… · New
• The version regex only accepts X.Y or X.Y.Z followed by whitespace/end-of-string. This will… · New

What changed in this PR

Fixes TypeSpec playground Python SDK generation by bundling browser-compatible dependency wheels and avoiding runtime PyPI/package-index resolution failures.

Changes:

• Add a dedicated build:playground path that resolves and publishes pure-Python wheels + a manifest at build time.
• Harden/standardize package-manager detection and venv bootstrapping with pinned/minimum pip/uv versions.
• Add unit + emitter tests and documentation describing the new browser wheel/manifest flow.

File	Description
packages/​http-client-python/​tests/​unit/​test_package_manager.py	Adds unit coverage for package-manager version floors and pip bootstrapping behavior.
packages/​http-client-python/​tests/​unit/​test_browser_wheels.py	Adds unit coverage for building/publishing the browser wheel manifest and pure wheels.
packages/​http-client-python/​package.json	Adds build:playground script and includes browser wheel assets + manifest in published files.
packages/​http-client-python/​eng/​scripts/​setup/​package_manager.py	Enforces minimum versions, pins pip, and changes venv bootstrapping/install command behavior.
packages/​http-client-python/​eng/​scripts/​setup/​build_pygen_wheel.py	Implements build-time browser wheel resolution + manifest generation; adds --playground CLI flag.
packages/​http-client-python/​eng/​scripts/​setup/​build.ts	Forwards CLI args to the Python wheel builder (enables --playground).
packages/​http-client-python/​eng/​pipeline/​publish.yml	Wires playground publication to use build:playground.
packages/​http-client-python/​emitter/​test/​browser-pyodide.test.ts	Adds emitter test ensuring browser installs bundled wheels without index queries + manifest error cases.
packages/​http-client-python/​emitter/​src/​emitter.ts	Loads manifest + bundled wheels in browser; installs with deps: false and loads native deps via Pyodide.
packages/​http-client-python/​emitter/​src/​constants.ts	Uses package.json as the single Pyodide-version source.
packages/​http-client-python/​ARCHITECTURE.md	Documents the new browser runtime behavior and build-time resolution constraints.
.chronus/​changes/​python-playground-browser-wheels.md	Adds changelog entry for the playground/browser-wheels fix and package-manager floors.

_{Review effort: Lite}

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-python

Show changes

@typespec/http-client-python - fix ✏️

Fix Python playground generation when package downloads are blocked on corporate networks. Publish browser-compatible dependency wheels with the emitter instead of querying PyPI or CFS at runtime. Prepare these assets only for playground builds.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@typespec/http-client-python@12484

commit: 43f4c91

[github-actions]

Python emitter diff

Baseline gh:3a87c089009146e1ce1201659c00f1179411a81f vs this PR.

No changes to generated output.

Rendered diff: inline on the run summary, or the emitter-diff-html artifact.

Informational check (eng/emitter-diff); does not block the PR.

[Copilot]

🟡 Changes recommended

The uv path creates an environment without pip, causing wheel downloads to fail with No module named pip and blocking build:playground.

1 open issue

• Bootstrap pip in uv-created environments before downloading wheels · New

3 resolved since last review

• manifest is typed as unknown, but the code accesses manifest.wheels directly. In TypeScript,…
• The version regex only accepts X.Y or X.Y.Z followed by whitespace/end-of-string. This will…
• next(dist.glob('pygen-*.whl')) will raise StopIteration if the wheel isn't present, which…

_{Review effort: Balanced}

[Copilot]

🟢 Approval recommended

No active review issues remain in the playground dependency-loading changes.

No open issues 🎉

1 resolved since last review

• Bootstrap pip in uv-created environments before downloading wheels

_{Review effort: Balanced}