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openspec/changes/enterprise-react-tree-view/proposal.md

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+# 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
+```