Cursor rules for full-stack SaaS applications on Cloudflare Workers with Hono AP

When to use this skill

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

Source

Synced from https://github.com/PatrickJS/awesome-cursorrules/tree/main/rules/cloudflare-workers-hono-angular-saas-cursorrules-prompt-file.mdc.

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;