# OpenSpec Change: enterprise-react-tree-view

- **Change ID**: enterprise-react-tree-view
- **Package**: `@suaveplan/react-tree-view`
- **Category**: react
- **Target path**: `react/ui/react-tree-view`
- **Status**: PROPOSED
- **Date**: 2026-04-24
- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/react-tree-view.md`

---

## Summary

Deliver `@suaveplan/react-tree-view` on genesis from scratch at enterprise quality. A hierarchical tree-view React component with controlled/uncontrolled expand/collapse, text-based filter, keyboard navigation, `renderNode` slot, and pure utility functions (`flattenTree`, `filterTree`, `collectAllIds`). The `useTreeState` hook centralises expanded-id state. Genesis adds `@suaveplan/error`-backed errors, `@suaveplan/react-virtual` integration for large trees, stories for every component, Playwright keyboard-nav E2E, and 100% coverage.

---

## Current-state audit (genesis)

Package does not exist on genesis — fresh build.

---

## Available workspace deps on genesis

| Package | Role |
|---|---|
| `@suaveplan/error` (`workspace:^`) | `TreeViewError` |
| `@suaveplan/react-translate` (`workspace:^`) | i18n for search placeholder, aria-labels |
| `@suaveplan/react-virtual` (`workspace:^`) | Virtualized nodes for large trees |
| `zod` (`catalog:forms`) | Config schemas |

External: `tslib catalog:build`. React 18 peer.

---

## Preserved public API surface

```ts
TreeView<T>            — top-level controlled/uncontrolled tree
TreeNodeComponent<T>   — single node renderer (arrow, indent, renderNode slot)
useTreeState           — expanded-ids Set, toggle/expand/collapse/expandAll/collapseAll/isExpanded

// Utils
flattenTree<T>(root: TreeNode<T>): TreeNode<T>[]
filterTree<T>(root: TreeNode<T>, predicate): TreeNode<T> | null
collectAllIds<T>(root: TreeNode<T>): string[]

// Types
TreeNode<T>, TreeViewProps<T>, UseTreeStateOptions, UseTreeStateReturn
```

---

## New additions for genesis

1. **Virtualized large trees** — `useTreeState` + `@suaveplan/react-virtual` when flattened node count > 100.
2. **`TreeViewError`** — code: `TREE_VIEW_CONTEXT_MISSING`.
3. **Full keyboard navigation** — `ArrowDown`/`ArrowUp` moves focus, `ArrowRight` expands, `ArrowLeft` collapses or moves to parent, `Enter`/`Space` selects.
4. **Stories** — `TreeView` and `TreeNodeComponent` each with `default`, `large-tree`, `with-search`, `keyboard-nav`, `playground`.
5. **Playwright E2E** — keyboard navigation and search filter.

---

## File layout

```text
react/ui/react-tree-view/
  package.json
  tsconfig.json
  vitest.config.ts
  src/
    index.ts
    components/
      tree-view/ (tsx + types + md + test + stories + index)
      tree-node/ (tsx + types + md + test + stories + index)
    hooks/
      use-tree-state/ (ts + types + md + test + index)
    types/
      tree.types.ts
    utils/
      tree-utils/ (ts + md + test + index)
      cn.ts
  e2e/
    tree-view.spec.ts
```