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flights_web/CLAUDE.md
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# Aeroflot.Flights.Web
## Current State
React 18 SSR application built with **Modern.js 2.70.8** (Rspack bundler) and **Module Federation 2.3.3**. The app is a remote frontend component embeddable in the customer's channel apps (Web, PWA).
**Stack:** Modern.js 2.70.8, React 18.2, Rspack, Module Federation 2.3.3, i18next (9 languages), PrimeReact, Leaflet, SignalR, OpenTelemetry, Vitest, Playwright.
**Source:** `src/` (file-based routing under `src/routes/`). Legacy Angular 12 SPA in `ClientApp/` (read-only reference, not deployed).
**Builds:** `pnpm build:standalone` (SSR server at `dist/standalone/`), `pnpm build:remote` (MF remote at `dist/remote/` with `mf-manifest.json`).
**Dev:** `pnpm dev` (Modern.js on :8081), `pnpm dev:full` (proxy on :8080 with API forwarding via curl to bypass WAF).
**Known constraint:** Modern.js 3.x upgrade is blocked by `@module-federation/modern-js` ESM incompatibilities (broken `__filename`/`require` in ESM bundles, missing `api.modifyWebpackConfig` in Rsbuild 2.0). React Router v7 future flags are enabled to suppress deprecation warnings.
## Contractual Requirements
The following are contractual hard constraints for the remote frontend component.
### 1. Tech Stack
- **ModernJS (SSR)** for the frontend framework.
- **Module Federation 2.0**. Any bundler with MF 2.0 support is acceptable: Webpack 5, Rsbuild, Rspack, or Vite.
- Must emit `mf-manifest.json` at `https://<domain>/mf-manifest.json` exposing components and logic. Reference: https://module-federation.io/guide/basic/webpack.html.
- **React 18+**, Concurrent Mode compatible.
- `<Suspense>` support required when async loading is used.
- Component bodies must be side-effect free — **no `fetch` outside `useEffect`**.
- Dynamic imports must use `React.lazy()`.
### 2. Data & Integrations
- Consumes customer REST APIs, JSON payloads only.
- Rendered data must stay consistent with API responses (no stale state leaking into the UI).
### 3. Performance
- Must sustain **100 RPS**.
### 4. Availability & Fault Tolerance
- VMs hosting the component must be geographically distributed.
- 24/7/365 availability; recovery time ≤ 6 hours after infra is restored.
### 5. Security
- Component must be isolated — no attack surface exposed to other components of the host site.
### 6. SEO & Accessibility
- SEO optimization required.
- Render microdata: **JSON-LD** and **OpenGraph**.
- Web analytics integrations: **Yandex.Metrica, CTM, Variocube, Key-Astrom (Dynatrace)**.
### 7. Cross-Platform
- Embeddable in multiple channel apps (Web, PWA).
- Fully responsive ("fluid") layout across all screen sizes.
### 8. Logging & Monitoring
- Frontend log collection in a customer-specified format, shipped to the customer's log aggregation system.
- System event monitoring with export to a metrics aggregator.
### 9. Module Structure
- Must conform to the customer's standard remote frontend module structure for uniform deployment.
### 10. Design
- Implement against customer-provided mockups using the customer's design system.
- Must embed other customer remote components when available.
## Commit Rules
- Never add `Co-Authored-By` lines to commit messages.
- Commit messages in English, concise, focused on "why" not "what".
- Commit autonomously when changes are complete and stable — no need to ask for permission. Group related edits into logical commits. Still ask before pushing, force-pushing, or any destructive git operation.