hyperdx/agent_docs/development.md

Development Workflows

Setup Commands

# Install dependencies and setup hooks
yarn setup

# Start full development stack (Docker + local services)
yarn dev

Key Development Scripts

• yarn app:dev: Start API, frontend, alerts task, and common-utils in watch mode
• yarn lint: Run linting across all packages
• yarn dev:int: Run integration tests in watch mode
• yarn dev:unit: Run unit tests in watch mode (per package)

Environment Configuration

• .env.development: Development environment variables
• Docker Compose manages ClickHouse, MongoDB, OTel Collector
• Hot reload enabled for all services in development

Testing Strategy

Testing Tools

• Unit Tests: Jest with TypeScript support
• Integration Tests: Jest with database fixtures
• Frontend Testing: React Testing Library + Jest
• E2E Testing: Custom smoke tests with BATS

Testing Patterns

• TDD Approach: Write tests before implementation for new features
• Test organization: Tests co-located with source files in __tests__/ directories
• Mocking: MSW for API mocking in frontend tests
• Database testing: Isolated test databases with fixtures

CI Testing

For integration testing in CI environments:

# Start CI testing stack (ClickHouse, MongoDB, etc.)
docker compose -p int -f ./docker-compose.ci.yml up -d

# Run integration tests
yarn dev:int

CI Testing Notes:

• Uses separate Docker Compose configuration optimized for CI
• Isolated test environment with -p int project name
• Includes all necessary services (ClickHouse, MongoDB, OTel Collector)
• Tests run against real database instances for accurate integration testing

Common Development Tasks

Adding New Features

1. API First: Define API endpoints and data models
2. Database Models: Create/update Mongoose schemas and ClickHouse queries
3. Frontend Integration: Build UI components and integrate with API
4. Testing: Add unit and integration tests
5. Documentation: Update relevant docs

Debugging

• Check browser and server console output for errors, warnings, or relevant logs
• Add targeted logging to trace execution and variable states
• For persistent issues, check fixes/ directory for documented solutions
• Document complex fixes in fixes/ directory with descriptive filenames

Code Quality

Pre-commit Hooks

The project uses Husky + lint-staged to automatically run:

• Prettier for formatting
• ESLint for linting
• API doc generation (for external API changes)

These run automatically on git commit for staged files.

Manual Linting (if needed)

If you need to manually lint:

# Per-package linting with auto-fix
cd packages/app && yarn run lint:fix
cd packages/api && yarn run lint:fix
cd packages/common-utils && yarn lint:fix

# Check all packages
yarn run lint

File Locations Quick Reference

• Config: packages/api/src/config.ts, packages/app/next.config.js, docker-compose.dev.yml
• Models: packages/api/src/models/
• API Routes: packages/api/src/routers/
• Controllers: packages/api/src/controllers/
• Pages: packages/app/pages/
• Components: packages/app/src/
• Shared Utils: packages/common-utils/src/