@ -585,3 +585,75 @@ Fixed list-table-v2 issues:
@@ -585,3 +585,75 @@ Fixed list-table-v2 issues:
### Next Steps
- None - task complete
## Session 15: Rebuild list-table-v2: Scaffold hooks and types
**Date**: 2026-04-03
**Task**: Rebuild list-table-v2: Scaffold hooks and types
### Summary
Scaffolded list-table-v2 hooks for pretext-based virtualized table. PR1 complete: hooks + types created.
### Main Changes
## What was done
**Research**: Explored pretext-table (ShipItAndPray) and virtual-table (aimerthyr) implementations. pretext-table uses custom prefix-sum virtualizer + pretext text measurement (no TanStack Virtual).
**PRD Created**: Full requirements documented:
- Custom prefix-sum virtualizer (pretext-table style, lightweight)
- @chenglou/pretext for text measurement
- Variance-based flexGrow/flexShrink from sampled data
- Runtime augmentation for custom cellRenderers
- Cell renderers return plain VNode or {vnode, minHeight, minWidth}
## PR1: Scaffold ✅ COMPLETE
```
packages/base/data/list-table-v2/
├── index.ts # Exports all hooks and types
├── types.ts # ListTableColumn< T > , ListTableProps, etc.
├── measureText.ts # Cached pretext measurement
├── usePretextColumnWidths.ts # Variance-based flex params
├── usePretextRowHeights.ts # Pre-computed row heights
├── useVirtualRows.ts # Prefix-sum + binary search virtualizer
└── useRuntimeHeightAugment.ts # ResizeObserver + running average
```
## Key Design Decisions
1. **prepareWithSegments() caching** : Using prepareWithSegments for everything since it's the superset type that works with both layout() and walkLineRanges(). Cache is LRU-capped at 10,000 entries.
2. **walkLineRanges for shrink-wrap** : Using walkLineRanges with large maxWidth to find widest line — handles embedded \n correctly and avoids binary search.
3. **Variance formula** : varianceScore = min(1, σ / (μ * 0.5)); flexGrow/flexShrink = 0.1 + varianceScore * 1.9
## Remaining PRs
| PR | Goal |
|----|------|
| PR2 | Wire hooks into Vue component, flex container, virtual scrolling |
| PR3 | cellRenderer {vnode, minHeight} return type, ResizeObserver augmentation |
| PR4 | Fixed columns, pagination, slots, polish |
### Git Commits
| Hash | Message |
|------|---------|
| `0f72b83` | (see git log) |
| `87000d8` | (see git log) |
### Testing
- [OK] (Add test results)
### Status
[OK] **Completed**
### Next Steps
- None - task complete
