OpenSpec Change: enterprise-react-calendar

Change ID: enterprise-react-calendar
Package: @suaveplan/react-calendar
Category: react
Target path: react/forms/react-calendar
Status: PROPOSED
Date: 2026-04-24
Reference spec: /mnt/s/web/suaveplan/enterprise/react-calendar.md

Summary

Deliver @suaveplan/react-calendar on genesis from scratch at enterprise quality. Headless calendar engine (useCalendar) plus Calendar component with month/week/day/agenda views. Ships four per-view components, CalendarHeader, typed CalendarEvent/CalendarEventMap with @suaveplan/events emitter. Genesis adds Storybook stories (zero currently exist), Playwright E2E, event store indexing for O(1) lookups, and @suaveplan/datetime integration for timezone-aware date math.

Current-state audit (genesis)

Package does not exist on genesis — fresh build.

Available workspace deps on genesis

Package	Role
`@suaveplan/error` (`workspace:^`)	`CalendarError`
`@suaveplan/events` (`workspace:^`)	`EventBus` for calendar events
`@suaveplan/datetime` (`workspace:^`)	Timezone-aware date math
`@suaveplan/react-translate` (`workspace:^`)	i18n
`zod` (`catalog:forms`)	Event/config schemas
`@opentelemetry/api` (`catalog:observability`)	`calendar.navigate` span

External: tslib catalog:build. React 18 peer.

Preserved public API surface

Calendar, CalendarAgendaView, CalendarDayView, CalendarHeader,
CalendarMonthView, CalendarWeekView
useCalendar (+ UseCalendarReturn)

// Types
CalendarConfig, CalendarEvent, CalendarEventMap,
CalendarHeaderProps, CalendarProps, CalendarView,
CalendarViewProps, DateRange, NavigationDirection

New additions for genesis

@suaveplan/datetime integration — useCalendar uses @suaveplan/datetime addDuration/startOf/endOf for view range computation; accepts optional timeZone.
O(1) event lookup — event store is a Map<string, CalendarEvent[]> keyed by ISO date string.
CalendarError — codes: CALENDAR_INVALID_EVENT, CALENDAR_VIEW_NOT_SUPPORTED.
Stories — Calendar (month, week, day, agenda, with-events, empty, playground), CalendarHeader (all navigations), each view component.
Playwright E2E — click next/prev, verify date advances; add event, verify appears in month view.

File layout

react/forms/react-calendar/
  package.json
  tsconfig.json
  vitest.config.ts
  src/
    index.ts
    hooks/
      use-calendar/ (ts + types + md + test + index)
    components/
      calendar/ (tsx + types + md + test + stories + index)
      calendar-header/ (tsx + types + md + test + stories + index)
      month-view/ week-view/ day-view/ agenda-view/
    types/
      calendar.types.ts
    utils/
      cn.ts
  e2e/
    calendar.spec.ts

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