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The rule corpus

Every rule we write, published in full

39 rules, free and ungated — read them, copy them, run them through your own agent. Each one ships to six tools, and each one has a maintenance history you can read before you trust it.

v1.5.1 · hand-written, reviewed against each vendor’s own docs
39 rules · 17 categories

Every project

4 rules
architecturecurrent

Architectural constraints for your project

6 of 6 formats · 47 lines
performancecurrent

Performance conventions

6 of 6 formats · 44 lines
testingcurrent

Testing conventions

6 of 6 formats · 46 lines
typescriptcurrent

TypeScript conventions

6 of 6 formats · 47 lines

Analytics

1 rule
posthogcurrent

Product analytics, feature flags and session replay.

6 of 6 formats · 44 lines

Auth

3 rules
auth0current

Hosted identity with enterprise SSO, MFA and fine-grained rules.

6 of 6 formats · 32 lines
clerkcurrent

Drop-in authentication with prebuilt sign-in, MFA and user management.

6 of 6 formats · 38 lines
supabase-authcurrent

Email, OAuth and magic-link sign-in issuing the JWT that Row Level Security reads.

6 of 6 formats · 29 lines

Backend

4 rules
fastapicurrent

Python API with typed request validation and generated OpenAPI docs.

6 of 6 formats · 46 lines
firebasecurrent

Google's app platform: authentication, Firestore, storage, functions and messaging.

6 of 6 formats · 38 lines
nestjscurrent

TypeScript server framework with dependency injection, modules and decorators.

6 of 6 formats · 33 lines
supabasecurrent

Postgres database, authentication, storage and realtime behind one client.

6 of 6 formats · 51 lines

CI/CD

2 rules
github-actionscurrent

Continuous integration and release automation running on GitHub.

6 of 6 formats · 40 lines
gitlab-cicurrent

Pipelines defined in .gitlab-ci.yml with built-in environments and approvals.

6 of 6 formats · 32 lines

Crash reporting

2 rules
crashlyticscurrent

Firebase crash reporting for native mobile apps, with crash-free user metrics.

6 of 6 formats · 33 lines
sentrycurrent

Crash and error reporting with stack traces, breadcrumbs and release tracking.

6 of 6 formats · 37 lines

Database

3 rules
firestorecurrent

Firebase's document database, queried directly from the client under security rules.

6 of 6 formats · 33 lines
postgresqlcurrent

Your own Postgres server, reached from your API. Not needed when a backend already provides one.

6 of 6 formats · 36 lines
sqlitecurrent

On-device SQL storage for offline-first data and local caching.

6 of 6 formats · 37 lines

Deployment

2 rules
eas-submitcurrent

Upload builds to the App Store and Play Store from CI.

6 of 6 formats · 33 lines
fastlanecurrent

Scripted build, signing and store upload with shared certificate management.

6 of 6 formats · 35 lines

Email

2 rules
resendcurrent

Transactional email with React-based templates and delivery webhooks.

6 of 6 formats · 34 lines
sendgridcurrent

Transactional email with dynamic templates and delivery analytics.

6 of 6 formats · 34 lines

Features

3 rules
dark-themecurrent

System-aware light/dark theming with a manual override, one hook for the whole app.

6 of 6 formats · 15 lines
localizationcurrent

Multi-language text via i18next, with device-locale detection and a typed translation key.

6 of 6 formats · 20 lines
onboardingcurrent

A first-run walkthrough that shows once, with a persisted "seen it" flag and a real skip path.

6 of 6 formats · 13 lines

Mobile

2 rules
expocurrent

Managed React Native tooling: config plugins, EAS builds and over-the-air updates.

6 of 6 formats · 42 lines
react-nativecurrent

Cross-platform iOS and Android apps from one TypeScript codebase.

6 of 6 formats · 51 lines

Monitoring

1 rule
betterstackcurrent

Uptime monitoring, log management and on-call alerting.

6 of 6 formats · 32 lines

Notifications

2 rules
expo-notificationscurrent

Push and local notifications through Expo's push service.

6 of 6 formats · 35 lines
onesignalcurrent

Push notifications with segmentation, scheduling and campaign analytics.

6 of 6 formats · 37 lines

Payments

2 rules
revenuecatcurrent

In-app subscriptions and purchases across the App Store and Play Store.

6 of 6 formats · 47 lines
stripecurrent

Card payments, subscriptions and billing for web checkout.

6 of 6 formats · 32 lines

Storage

2 rules
cloudflare-r2current

S3-compatible object storage with no egress fees, accessed through presigned URLs.

6 of 6 formats · 34 lines
supabase-storagecurrent

File and image storage with the same Row Level Security model as the database.

6 of 6 formats · 35 lines

Testing

2 rules
detoxcurrent

End-to-end tests driving the real app on a simulator or device.

6 of 6 formats · 35 lines
jestcurrent

Unit and component testing. Adapts its configuration to the platform you selected.

6 of 6 formats · 36 lines

Web

2 rules
nextjscurrent

React framework with server components, file-based routing and a build-in server runtime.

6 of 6 formats · 42 lines
reactcurrent

Single-page React application built with Vite. No server — everything ships to the browser.

6 of 6 formats · 37 lines

Rules are one command away

Answer the wizard and every rule for your stack lands in your repo, in the format each of your tools reads. Free, MIT, and it keeps working if you never pay.

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