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openspec/changes/enterprise-react-timeline/proposal.md

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+# OpenSpec Change: enterprise-react-timeline
+
+- **Change ID**: enterprise-react-timeline
+- **Package**: `@suaveplan/react-timeline`
+- **Category**: react
+- **Target path**: `react/ui/react-timeline`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/react-timeline.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/react-timeline` on genesis from scratch at enterprise quality. A hybrid DOM+Canvas React timeline library with three view modes: `Timeline` (horizontal scrolling), `Gantt` (dependency arrows), and `Calendar` (day/week/month grid). Ships building-block primitives, a headless layout engine, `TimelineProvider`, seven headless hooks, Canvas renderers, and time-math utilities. TypeScript generics on `TMeta` let events carry arbitrary metadata. Genesis adds `@suaveplan/react-virtual` integration for large event sets, `@suaveplan/error`-backed errors, OTel instrumentation, hook playground stories, and Playwright visual-regression snapshots.
+
+---
+
+## Current-state audit (genesis)
+
+Package does not exist on genesis — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | `TimelineError` |
+| `@suaveplan/types` (`workspace:^`) | Shared types |
+| `@suaveplan/react-translate` (`workspace:^`) | i18n |
+| `@suaveplan/react-virtual` (`workspace:^`) | Virtual row rendering for large event sets |
+| `zod` (`catalog:forms`) | Config schemas |
+| `@opentelemetry/api` (`catalog:observability`) | Span events |
+
+External: `clsx catalog:ui`, `tailwind-merge catalog:ui`, `tslib catalog:build`. React 18 peer.
+
+---
+
+## Preserved public API surface
+
+### Components
+
+`Timeline<TMeta>`, `Gantt<TMeta>`, `Calendar<TMeta>`, `EventBar`, `GridLines`, `Marker`, `TimeRuler`, `TrackRow`, `TimelineTooltip`, `DependencyArrow`
+
+### Context
+
+`TimelineProvider`, `useTimelineContext`
+
+### Engine
+
+`computeLayout`
+
+### Hooks
+
+`useTimeline`, `useDrag`, `usePan`, `useScale`, `useSelection`, `useVirtual`, `useZoom`
+
+### Canvas renderers
+
+`drawGridLines`, `drawTrackLines`, `setupCanvas`, `drawEvents`, `drawDependencyArrows`
+
+### Time utilities
+
+`addTime`, `clampDate`, `dateToPixel`, `diffMs`, `generateTicks`, `pixelToDate`, `snapToGrid`
+
+### Types
+
+Full `TMeta`-generic type set including `TimelineEvent`, `TimelineTrack`, `TimeScaleConfig`, `LayoutResult`, `DragState`, `SelectionState`.
+
+---
+
+## New additions for genesis
+
+1. **`@suaveplan/react-virtual` integration** — `useVirtual` hook delegates to `@suaveplan/react-virtual` `useVirtualList` when event count > 500.
+2. **Timezone-aware `TimeScaleConfig`** — optional `timeZone: string` field; all pixel math uses UTC offsets.
+3. **Collision avoidance story** — `Gantt` stories include overlapping events demonstrating lane computation.
+4. **Hook playground stories** — one story per hook showing its isolated state.
+5. **Playwright visual-regression snapshots** — Canvas rendering verified via screenshot diffing.
+
+---
+
+## File layout
+
+```text
+react/ui/react-timeline/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    core/
+      context/ (tsx + types + md + test + index)
+      engine/ (ts + types + md + test + index)
+      types/ (ts + md)
+    components/
+      timeline/ gantt/ calendar/
+      event-bar/ grid-lines/ marker/ time-ruler/
+      track-row/ tooltip/ dependency-arrow/
+    hooks/
+      use-timeline/ use-drag/ use-pan/ use-scale/
+      use-selection/ use-virtual/ use-zoom/
+    renderers/
+      canvas-renderer/ event-renderer/
+    utils/
+      cn/ time-utils/ layout/ scale-config/
+    styles/
+      timeline.css
+  tests/
+    integration.test.tsx
+  e2e/
+    timeline.spec.ts
+```

openspec/changes/enterprise-react-timeline/tasks.md

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+# Tasks: enterprise-react-timeline
+
+**Change ID**: enterprise-react-timeline
+**Package**: `@suaveplan/react-timeline`
+**Target path**: `react/ui/react-timeline`
+**Prerequisite packages on Verdaccio**: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/react-translate`, `@suaveplan/react-virtual`
+
+---
+
+## 0. Pre-flight (non-negotiable)
+
+- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
+- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
+- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.
+
+## 1. Scaffold
+
+- [ ] Create directory tree per proposal layout.
+- [ ] Write `package.json` at `0.1.0` with `"sideEffects": ["**/*.css"]`, exports map.
+- [ ] Dependencies: `@suaveplan/error workspace:^`, `@suaveplan/types workspace:^`, `@suaveplan/react-translate workspace:^`, `@suaveplan/react-virtual workspace:^`, `clsx catalog:ui`, `tailwind-merge catalog:ui`, `zod catalog:forms`, `@opentelemetry/api catalog:observability`, `tslib catalog:build`.
+- [ ] Write `tsconfig.json`, `vitest.config.ts`, scripts.
+
+---
+
+## 2. Types and errors
+
+- [ ] Define `TimelineError` extending `SuaveplanError`; codes: `TIMELINE_INVALID_EVENT`, `TIMELINE_LAYOUT_FAILED`.
+- [ ] Define all public types: `TimelineEvent<TMeta>`, `TimelineTrack<TMeta>`, `TimeScaleConfig` (with optional `timeZone`), `LayoutResult`, `DragState`, `SelectionState`, `DependencyEdge`.
+- [ ] Write Zod `TimeScaleConfigSchema`.
+
+---
+
+## 3. Core context and engine
+
+- [ ] Implement `TimelineProvider` — context value with scale, view, viewport, event store, dispatch.
+- [ ] Implement `useTimelineContext` — throws `TimelineError(TIMELINE_INVALID_EVENT)` when used outside provider.
+- [ ] Implement `computeLayout<TMeta>(events, tracks, scale)` — overlap resolution (greedy lane assignment), returns `LayoutResult` with per-event pixel bounds and lane index.
+- [ ] Write tests + md for context and engine. `{ timeout: 5000 }`.
+
+---
+
+## 4. Hooks (7)
+
+For each hook:
+
+- [ ] Implement with full types, using `TimelineProvider` state.
+- [ ] `useVirtual` — delegates to `@suaveplan/react-virtual` `useVirtualList` when event count > 500; falls back to full render below.
+- [ ] Write `<hook>.test.ts` (≤500 lines) + `<hook>.md` + `<hook>.stories.tsx` (playground variant).
+
+---
+
+## 5. Canvas renderers
+
+- [ ] `src/renderers/canvas-renderer/` — `drawGridLines(ctx, scale, viewport)`, `drawTrackLines(ctx, tracks, scale)`, `setupCanvas(canvas, dpr)`.
+- [ ] `src/renderers/event-renderer/` — `drawEvents(ctx, items, scale)`, `drawDependencyArrows(ctx, edges, scale)`.
+- [ ] Write tests using `OffscreenCanvas` (available in Node via `@suaveplan/testing` polyfill). Write md.
+
+---
+
+## 6. Components
+
+For each component (`Timeline`, `Gantt`, `Calendar`, primitives):
+
+- [ ] Implement component referencing context + engine + renderers.
+- [ ] `Timeline` + `Gantt` + `Calendar` — each has stories: `default`, `large-dataset` (1000 events), `gantt-dependencies`, `calendar-month`, `playground`.
+- [ ] All primitive components — stories: `default`, `playground`.
+- [ ] Write test + md for every component.
+
+---
+
+## 7. Time utilities
+
+- [ ] Implement `addTime`, `clampDate`, `dateToPixel`, `diffMs`, `generateTicks`, `pixelToDate`, `snapToGrid` in `src/utils/time-utils/`.
+- [ ] Timezone-aware: `dateToPixel` and `pixelToDate` accept optional `timeZone`.
+- [ ] Write `time-utils.test.ts` (≤500 lines), `time-utils.md`.
+
+---
+
+## 8. Integration and E2E
+
+- [ ] `tests/integration.test.tsx` — `Timeline` with 50 events: layout produced, no overlapping items in same lane; `Gantt` renders dependency arrows.
+- [ ] `e2e/timeline.spec.ts` — Playwright: render `Timeline`, take screenshot snapshot; render `Gantt` with overlapping events, verify lane separation visually.
+
+---
+
+## 9. Verify and publish
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/react-timeline` — green.
+- [ ] `bunx turbo test:coverage --filter=@suaveplan/react-timeline` — 100%.
+- [ ] `bun scripts/publish.ts --package @suaveplan/react-timeline`.
+- [ ] Archive change folder.