fix: debug and fix WASM marimo test selectors (approach A)#530
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…ility in Pyodide
The WASM Playwright test timed out because micropip.install("buckaroo")
failed on fastparquet (C extension with no pure-Python wheel for Pyodide).
This cascaded to all downstream cells, preventing widget rendering.
Three-part fix:
- WASM notebooks: install deps manually with deps=False, create a minimal
fastparquet stub module so buckaroo's import chain succeeds
- serialization_utils.py: make fastparquet import optional (try/except)
for forward compatibility when the next release is published to PyPI
- Test: replace fixed-timeout waitFor with polling loop, increase timeout
to 300s, add console log capture for CI debugging
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Closing in favor of #532 (uses real Pyodide-bundled fastparquet) |
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Summary
micropip.install("buckaroo", keep_going=True)fails in Pyodide becausefastparquet(a C extension) has no pure-Python wheel. Despitekeep_going=True, the install raises aValueError, crashing the first cell and cascading failures to all downstream cells that use BuckarooWidget.deps=False, and create a minimalfastparquetstub module (types.ModuleType) so buckaroo's import chain succeeds. Applied to all three WASM notebooks.fastparquetimport optional inbuckaroo/serialization_utils.pyviatry/except ImportError, so future releases don't need the stub workaround.waitForwith fixed timeout (which was too short at 60s) with a polling loop that waits up to 240s for content + 60s for widgets, with console log capture for CI debugging.Test plan
bash scripts/marimo_wasm_output.sh buckaroo_simple.py runin CI or pre-committed HTML)🤖 Generated with Claude Code