HealthLog/CONTRIBUTING.md

Contributing to HealthLog

Contributions are welcome. This guide covers how to set up the project and submit changes.

Prerequisites

• Node.js 20+
• pnpm
• PostgreSQL 16+ (or Docker)
• Git

Setup

git clone https://github.com/MBombeck/HealthLog.git
cd HealthLog
cp .env.example .env

Edit .env and configure at minimum:

POSTGRES_PASSWORD=<base64, 24 bytes>
DATABASE_URL="postgresql://healthlog:${POSTGRES_PASSWORD}@db:5432/healthlog"
SESSION_SECRET=<64-char hex>
ENCRYPTION_KEY=<64-char hex>
API_TOKEN_HMAC_KEY=<64-char hex>

Generate the four secrets:

echo "POSTGRES_PASSWORD=$(openssl rand -base64 24)" >> .env
echo "SESSION_SECRET=$(openssl rand -hex 32)"       >> .env
echo "ENCRYPTION_KEY=$(openssl rand -hex 32)"       >> .env
echo "API_TOKEN_HMAC_KEY=$(openssl rand -hex 32)"   >> .env

With Docker (database only)

docker compose up -d db
pnpm install
pnpm db:generate
pnpm db:migrate
pnpm dev

Full Docker

docker compose up -d

Development Workflow

pnpm dev             # Start dev server (http://localhost:3000)
pnpm lint            # ESLint
pnpm format:check    # Prettier (check)
pnpm typecheck       # TypeScript strict mode
pnpm test            # Vitest
pnpm build           # Next.js production build

All five checks must pass before submitting a PR. The full one-liner that mirrors CI:

pnpm typecheck && pnpm lint && pnpm test && pnpm format:check && pnpm build

Code Conventions

• TypeScript strict mode -- avoid any. Where it's truly unavoidable (e.g. variadic Next.js handler signatures in src/lib/api-handler.ts), document the reason inline.
• English-default UI -- the default locale is English. German is user-selectable. Code, comments, commit messages, and docs are English. All user-facing strings go through t("key") with translations in both messages/en.json and messages/de.json. The i18n-locale-integrity.test.ts suite blocks merges if keys drift between locales or duplicate at any nesting depth.
• API responses follow the { data, error } envelope via apiSuccess() / apiError() in src/lib/api-response.ts. Wrap every route handler in apiHandler() (src/lib/api-handler.ts) for error handling, structured Wide-Event logging, and x-request-id propagation.
• Zod v4 (import { ... } from "zod/v4") for input validation in API routes and forms.
• shadcn/ui components (new-york style) for UI primitives.
• Dracula theme -- dark mode is the default; a light/system toggle is exposed in the topbar. Chart and accent colors use the --dracula-* CSS tokens so both themes stay coherent.

See CLAUDE.md for detailed architecture and patterns.

Database Changes

# After modifying prisma/schema.prisma:
pnpm db:migrate     # Creates a new migration
pnpm db:generate    # Regenerates Prisma client

Always include the migration file in your PR.

Pull Requests

1. Fork the repository
2. Create a feature branch (git checkout -b feature/your-feature)
3. Make your changes
4. Ensure all checks pass (pnpm typecheck && pnpm lint && pnpm test && pnpm format:check && pnpm build)
5. Submit a PR with a clear description of the changes

Security

If you find a security vulnerability, do not open a public issue. See SECURITY.md for responsible disclosure instructions.

License

By contributing, you agree that your contributions will be licensed under the AGPL-3.0 license.