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feat(mosaic): add column widths to Table - #10291

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alexcarpenter merged 5 commits into
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carp/mosaic-table-column-widths
Oct 19, 2026
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alexcarpenter merged 5 commits into
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carp/mosaic-table-column-widths

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@alexcarpenter

@alexcarpenter alexcarpenter commented Oct 19, 2026 •

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Description

Adds column widths to the Mosaic Table.

  • Table.Root takes layout: 'auto' (default, columns size to their content) or 'fixed' (columns size from the column group, not their content).
  • New Table.ColumnGroup (<colgroup>) and Table.Column (<col>). Table.Column takes an optional width (any CSS length). A column without width takes the space the others leave.
  • Table.SelectAllCell and Table.SelectCell now set their own width (one checkbox plus their padding) instead of width: 0, so a bare <Table.Column /> over the select column works with layout='fixed'. With layout='auto' the select column is the same size as before.

With layout='fixed', columns keep their size when the rows change, for example when skeleton rows are swapped for loaded rows. A column without width can shrink to nothing in a narrow table, so give Table.Root a minWidth through xstyle; below it, the table scrolls horizontally instead.

Swingset: the table page documents the new parts, data-layout and the new classes, and a ColumnWidths story shows a fixed layout with a select column and a table min width.

#10289 stacks on this PR.

Checklist

  • pnpm test runs as expected.
  • pnpm build runs as expected.
  • (If applicable) JSDoc comments have been added or updated for any package exports
  • (If applicable) Documentation has been updated

Type of change

  • 🐛 Bug fix
  • 🌟 New feature
  • 🔨 Breaking change
  • 📖 Refactoring / dependency upgrade / documentation
  • other:

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changeset-bot Bot commented Oct 19, 2026 •

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🦋 Changeset detected

Latest commit: 94935ff

The changes in this PR will be included in the next version bump.

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📝 Walkthrough

The table root now supports auto and fixed layout modes, with auto as the default. The API adds ColumnGroup and Column components, and Column applies a supplied width. The table barrel exports the related prop types and layout type. Documentation and a story describe column widths and layout behavior.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: austincalvelage

Merge Risk: ⚪ Minimal · up to 0c3ce

The documentation now scopes stable column widths to fixed layout and describes auto layout as content-sized. No actionable merge-blocking risk remains from the reviewed changes.

Pre-merge checks: Passed 4 · Failed 1

Failed Failed checks: 1 warning

Check name Status Explanation Resolution
Docstring Coverage Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (1 skipped: 1 … Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed Passed checks: 4 passed
Check name Status Explanation
Title check Passed The title clearly and concisely describes the main change: adding column-width support to the Mosaic Table.
Description check Passed The description is directly related to the changeset and explains the new layout options, column components, select-cell sizing, documentation, and example story.
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (1 skipped: 1 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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commit: 94935ff

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Actionable comments posted: 1


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @packages/mosaic/src/components/table/table.styles.ts:
- Line 109: Update the Table.ColumnGroup width documentation to clarify that the
specified width is used when cell content fits, including during
skeleton-to-loaded row changes, and that automatic table layout may expand or
shrink columns when content or available table width requires it. Do not change
the table layout or constrain cells.

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📒 Files selected for processing: 5
  • packages/mosaic/src/components/table/index.ts
  • packages/mosaic/src/components/table/table.styles.ts
  • packages/mosaic/src/components/table/table.tsx
  • packages/swingset/src/stories/table.mdx
  • packages/swingset/src/stories/table.stories.tsx
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Comment thread packages/mosaic/src/components/table/table.styles.ts Outdated
Restores the fixed layout from abdca9f (reverts cd8b8c9) and gives the ColumnWidths story a table min width.
@alexcarpenter
alexcarpenter merged commit afc58ee into main Oct 19, 2026
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@alexcarpenter
alexcarpenter deleted the carp/mosaic-table-column-widths branch October 19, 2026 20:58

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