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openspec/changes/enterprise-react-error-boundary/proposal.md

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+# OpenSpec Change: enterprise-react-error-boundary
+
+- **Change ID**: enterprise-react-error-boundary
+- **Package**: `@suaveplan/react-error-boundary`
+- **Category**: react
+- **Target path**: `react/ui/react-error-boundary`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/react-error-boundary.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/react-error-boundary` on genesis from scratch at enterprise quality. A React class-component error boundary: `ErrorBoundary` (fallback/FallbackComponent/onError/onReset/resetKeys), `DefaultFallback`, and `useErrorBoundary` hook. Genesis adds `@suaveplan/error` integration, OTel span-event capture on catch, i18n for default fallback copy, Storybook stories, and Playwright E2E.
+
+---
+
+## Current-state audit (genesis)
+
+Package does not exist on genesis — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | `SuaveplanError` type narrowing in `onError` |
+| `@suaveplan/react-translate` (`workspace:^`) | i18n for `DefaultFallback` copy |
+| `@opentelemetry/api` (`catalog:observability`) | Span event `error_boundary.caught` |
+
+External: `tslib catalog:build`. React 18 peer.
+
+---
+
+## Preserved public API surface
+
+```ts
+ErrorBoundary         — getDerivedStateFromError + componentDidCatch, resetKeys, onError, onReset
+DefaultFallback       — minimal error UI with "Try again" button
+useErrorBoundary      — programmatic throw into nearest boundary
+
+// Types
+ErrorBoundaryProps, ErrorBoundaryState, FallbackProps, UseErrorBoundaryReturn
+```
+
+---
+
+## New additions for genesis
+
+1. **OTel `error_boundary.caught` span event** — attributes: `error.message`, `error.code` (if `SuaveplanError`), `error.type`.
+2. **i18n `DefaultFallback`** — "Something went wrong", "Try again" via `useTranslation`.
+3. **Storybook** — `ErrorBoundary` default (forced throw), `useErrorBoundary` playground, `DefaultFallback` standalone, custom `FallbackComponent`.
+4. **Playwright E2E** — render a component that throws; verify fallback shown; click "Try again"; verify reset.
+
+---
+
+## File layout
+
+```text
+react/ui/react-error-boundary/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    components/
+      error-boundary/ (tsx + types + md + test + stories + index)
+      default-fallback/ (tsx + types + md + test + stories + index)
+    hooks/
+      use-error-boundary/ (ts + types + md + test + stories + index)
+  e2e/
+    error-boundary.spec.ts
+```