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Cloudflare Workers Hono Angular Saas Cursor Rules

Cursor rules for full-stack SaaS applications on Cloudflare Workers with Hono APIs, Angular frontends, typed RPC, D1/Neon, and production observability.

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---
description: "Cursor rules for full-stack SaaS applications on Cloudflare Workers with Hono APIs, Angular frontends, typed RPC, D1/Neon, and production observability."
globs: **/*
alwaysApply: false
---
# Cloudflare Workers + Hono + Angular SaaS

Full-stack SaaS on Cloudflare Workers with Hono API, Angular frontend, and enterprise integrations.

## Stack
CF Workers+Hono v4.12+ | Angular 21+Ionic 8+PrimeNG 21 | D1/Neon | Drizzle v1 | Zod | Clerk Core 3 | Stripe | Inngest v4 | Resend | Bun 1.3 | Playwright v1.59+ | Vitest | ESLint+Prettier | PostHog | Sentry

## TypeScript
- Strict mode, never `any` (use `unknown`), prefer `interface` over `type`
- `readonly` when not reassigned, `undefined` over `null`
- Zod as source of truth for validation
- ESLint flat config (`eslint.config.ts`) + typescript-eslint + Prettier

## Hono API
- Inline handlers for RPC type inference (never separate controller files)
- Method chaining: `app.use().get().post()` preserves types
- `hc<AppType>(BASE_URL)` for typed client
- `@hono/zod-validator` on ALL request bodies
- `app.onError()` + `app.notFound()` centralized
- Split large apps: `app.route('/path', subApp)`
- Error envelope: `{ error: string, code?: string, details?: unknown }`
- `createFactory<{ Bindings: Env }>()` for reusable middleware chains
- `GET /health` returns `{ status, version, timestamp }`

## Angular
- Standalone only (no NgModules), Angular 21 zoneless by default
- Signals stable: `signal()`, `computed()`, `effect()`, `linkedSignal()`, `resource()`
- `HttpResource` for data fetching
- Control flow: `@if`/`@for`/`@switch`/`@defer` (not `*ngIf`/`*ngFor`)
- kebab-case files, one component per file, `providedIn: 'root'`
- PrimeNG for UI components

## Drizzle v1
- `sqliteTable` for D1, plural snake_case tables
- `$inferSelect`/`$inferInsert` for types
- `createInsertSchema`/`createSelectSchema` from `drizzle-orm/zod`
- Batch API (not `BEGIN` — D1 doesn't support transactions)
- Prepared statements for repeated queries

## CF Workers
- CPU limit: 10ms free / 30s paid
- `ctx.waitUntil()` for async post-response work
- `ctx.passThroughOnException()` for graceful degradation
- Bindings typed via `Env` interface
- D1 global read replication for latency reduction
- Workers Builds for native CI/CD (preview URLs per branch)

## Inngest v4 (Background Jobs)
- `eventType('name', { schema: z.object({...}) })` per-event (v4 breaking)
- `inngest/cloudflare` adapter + `inngest.setEnvVars(c.env)` for Workers
- Step functions: `step.run()`, `step.sleep()`, `step.waitForEvent()`, `step.sendEvent()`
- `step.ai.infer()` offloads inference (zero compute during wait)
- `step.realtime.publish()` for durable pub/sub
- Each step idempotent, retried independently

## Testing (TDD)
- Failing test FIRST, then implement
- Playwright for E2E: 6 breakpoints (375, 390, 768, 1024, 1280, 1920)
- Vitest for unit tests
- No sleeps — use `waitFor`/`toBeVisible()`
- Selectors: `data-testid` > role > text
- axe-core 0 violations
- `PROD_URL` env var for production testing

## Security (OWASP Top 10:2025)
- Must: HSTS, CSP (nonce-based strict), X-Content-Type-Options, X-Frame-Options
- Must: Referrer-Policy, Permissions-Policy, COOP, COEP, CORP
- Remove: X-XSS-Protection, Expect-CT, Server, X-Powered-By
- Turnstile on all forms, Zod validation on all inputs
- Stripe webhooks: verify signature, deduplicate via KV

## Auth (Clerk)
- JWT verified per-request (no session store)
- Webhook sync: Clerk → D1 for user data
- RBAC: Clerk org roles for org-scoped, D1 for app-level
- Route layers: public → auth-only → role-gated → owner-only

## Quality
- Lighthouse: a11y ≥95, perf ≥75
- WCAG 2.2 AA compliance
- LCP ≤2.5s, CLS ≤0.1, INP ≤200ms
- JS ≤200KB gz, CSS ≤50KB gz
- Functions ≤50 lines, cyclomatic complexity ≤10

## Deploy
```bash
npx wrangler deploy && curl -sX POST \
  "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/purge_cache" \
  -H "Authorization: Bearer ${CF_API_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{"purge_everything":true}'
```

## Hono Worker Starter
```typescript
import { Hono } from 'hono';
import { secureHeaders } from 'hono/secure-headers';
import { cors } from 'hono/cors';

interface Env {
  DB: D1Database;
  KV: KVNamespace;
  AI: Ai;
  TURNSTILE_SECRET: string;
}

const app = new Hono<{ Bindings: Env }>();
app.use('*', secureHeaders());
app.use('/api/*', cors({ origin: ['https://yourdomain.com'] }));
app.get('/health', (c) => c.json({ status: 'ok', timestamp: new Date().toISOString() }));
export default app;
```