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@sdip15fa sdip15fa commented Dec 9, 2025

Summary

Fixes #2241 - RangeError when parsing markdown with numbered lists.

The parse() method in NumberedListItem block now always returns an object with the start property, eliminating the RangeError that occurred when ProseMirror expected all schema-defined attributes to be present.

Rationale

When parsing markdown with numbered lists, the old code would sometimes return an object without the start property (returning only defaultProps). While this worked in some code paths due to ProseMirror automatically filling defaults, it caused a RangeError: No value supplied for attribute start in other scenarios where nodes were created more directly.

The fix normalizes the return value to always include the start property, ensuring consistency across all code paths.

Changes

Modified:

  • packages/core/src/blocks/ListItem/NumberedListItem/block.ts - Changed parse method to always return object with start property

Added:

  • tests/src/unit/core/blocks/NumberedListItem.test.ts - Unit test that directly tests the parse() function
  • tests/src/unit/core/formatConversion/parse/parseTestInstances.ts - Integration test for numbered list markdown parsing
  • tests/src/unit/core/formatConversion/parse/__snapshots__/markdown/issue2241NumberedListStartProperty.json - Test snapshot

Code change:

// Before (7 lines, conditional return):
if (element.previousElementSibling || startIndex === 1) {
  return defaultProps;  // ❌ Missing 'start' property
}
return {
  ...defaultProps,
  start: startIndex,
};

// After (3 lines, single return):
return {
  ...defaultProps,
  start: element.previousElementSibling || startIndex === 1 ? undefined : startIndex,
};

Impact

  • Backward Compatibility: ✅ 100% maintained - explicit start: undefined is semantically identical to implicit undefined from schema default
  • Breaking Changes: ❌ None
  • Performance: No impact - same logic, same object allocation
  • Existing Functionality: All 64 existing parsing tests continue to pass

Testing

Unit Test (catches the bug):

  • Created NumberedListItem.test.ts with 5 test cases
  • With old code: ❌ 4 tests fail - returns { textAlignment: undefined } (missing start)
  • With new code: ✅ All 5 tests pass - always includes start property

Integration Test:

  • Added issue2241NumberedListStartProperty test case
  • Tests numbered lists starting at 1 and starting at non-standard indices
  • Verifies end-to-end markdown parsing works correctly

All Tests:

  • ✅ 69 total tests pass (5 new unit tests + 64 existing parsing tests)
  • ✅ Build successful (all 18 packages compiled)

Screenshots/Video

N/A - This is a bug fix for an internal parser issue with no visual changes.

Checklist

  • Code follows the project's coding standards.
  • Unit tests covering the new feature have been added.
  • All existing tests pass.
  • The documentation has been updated to reflect the new feature (N/A - internal bug fix)

Additional Notes

Why the integration test doesn't catch the old bug:

The existing integration tests use markdownToBlocks() which goes through ProseMirror's full parsing pipeline. ProseMirror automatically fills in missing attributes with schema defaults, so the RangeError doesn't occur in that code path.

The unit test catches the bug:

The new unit test directly tests the parse() function's return value, which reveals that the old code returned an object missing the start property. This test ensures the fix works correctly and prevents regression.

)

The parse method now always returns an object with the 'start' property,
eliminating the RangeError when ProseMirror expects all schema-defined
attributes to be present. The value is undefined when not needed, matching
the previous implicit behavior.

Added unit test that directly tests the parse() function to ensure it
always returns an object with the 'start' property. This test catches
the bug that the old code had (returning defaultProps without 'start').

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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vercel bot commented Dec 9, 2025

@sdip15fa is attempting to deploy a commit to the TypeCell Team on Vercel.

A member of the Team first needs to authorize it.

@nperez0111
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nperez0111 commented Dec 9, 2025

Thanks for submitting this fix, @sdip15fa. It is indeed something that we needed to add in. Thanks for going ahead of us and resolving it on your own. We will try to release this today along with some other changes

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pkg-pr-new bot commented Dec 9, 2025

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commit: 762d1b4

@nperez0111 nperez0111 merged commit 5d13b0a into TypeCellOS:main Dec 9, 2025
6 of 9 checks passed
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RangeError: No value supplied for attribute start when parsing markdown with numbered lists

2 participants