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Development Workflows

Setup Commands

# Install dependencies and setup hooks
yarn setup

# Start full development stack (auto-assigns unique ports per worktree)
yarn dev        # or equivalently: make dev

Key Development Scripts

  • yarn dev / make dev: Start full dev stack with worktree-isolated ports. A dev portal at http://localhost:9900 auto-starts showing all running stacks.
  • yarn dev:down / make dev-down: Stop the dev stack for the current worktree
  • make dev-portal: Start the dev portal manually (auto-started by yarn dev)
  • yarn lint: Run linting across all packages
  • 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

Worktree Isolation (Multi-Agent / Multi-Developer)

When multiple git worktrees need to run the dev stack simultaneously (e.g. multiple agents or developers working in parallel), use make dev instead of yarn dev. This automatically assigns unique ports per worktree.

How It Works

  1. A deterministic slot (0-99) is computed from the worktree directory name (via cksum)
  2. Each service gets a unique port: base + slot (see table below)
  3. Docker Compose runs with a unique project name (hdx-dev-<slot>)
  4. Volume paths include the slot to prevent data corruption between worktrees

Dev Port Mapping (base + slot)

Ports are allocated in the 30100-31199 range to avoid conflicts with CI integration tests (14320-40098) and E2E tests (20320-21399).

Service Base Port Range Env Variable
API server 30100 30100 - 30199 HYPERDX_API_PORT
App (Next.js) 30200 30200 - 30299 HYPERDX_APP_PORT
OpAMP 30300 30300 - 30399 HYPERDX_OPAMP_PORT
MongoDB 30400 30400 - 30499 HDX_DEV_MONGO_PORT
ClickHouse HTTP 30500 30500 - 30599 HDX_DEV_CH_HTTP_PORT
ClickHouse Native 30600 30600 - 30699 HDX_DEV_CH_NATIVE_PORT
OTel health 30700 30700 - 30799 HDX_DEV_OTEL_HEALTH_PORT
OTel gRPC 30800 30800 - 30899 HDX_DEV_OTEL_GRPC_PORT
OTel HTTP 30900 30900 - 30999 HDX_DEV_OTEL_HTTP_PORT
OTel metrics 31000 31000 - 31099 HDX_DEV_OTEL_METRICS_PORT
OTel JSON HTTP 31100 31100 - 31199 HDX_DEV_OTEL_JSON_HTTP_PORT

Dev Portal

The dev portal is a centralized web dashboard that discovers all running worktree stacks by inspecting Docker container labels and slot files.

# Start the portal (runs on fixed port 9900)
make dev-portal

# Open in browser
open http://localhost:9900

The portal auto-refreshes every 3 seconds and shows each worktree's:

  • Branch name and slot number
  • All services with status (running/stopped) and clickable port links
  • Separate cards for each active worktree

Overriding the Slot

# Use a specific slot instead of the auto-computed one
HDX_DEV_SLOT=5 make dev

Testing Strategy

Testing Tools

  • Unit Tests: Jest with TypeScript support
  • Integration Tests: Jest with database fixtures
  • Frontend Testing: React Testing Library + Jest
  • E2E Testing: Playwright (frontend) and Custom smoke tests with BATS (ingestion)

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 / Integration Testing

For integration testing:

# Build dependencies (run once before first test run)
make dev-int-build

# Run API integration tests (spins up Docker services, runs tests, tears down)
make dev-int FILE=<TEST_FILE_NAME>

# Run common-utils integration tests
make dev-int-common-utils FILE=<TEST_FILE_NAME>

Multi-agent / worktree support:

The make dev-int command automatically assigns unique Docker ports per worktree directory, so multiple agents can run integration tests in parallel without port conflicts.

  • A deterministic slot (0-99) is computed from the worktree directory name
  • Each slot gets its own Docker Compose project name and port range
  • Override the slot manually: make dev-int HDX_CI_SLOT=5 FILE=alerts
  • The slot and assigned ports are printed when dev-int starts

Port mapping (base + slot):

Service Default port (slot 0) Variable
ClickHouse HTTP 18123 HDX_CI_CH_PORT
MongoDB 39999 HDX_CI_MONGO_PORT
API test server 19000 HDX_CI_API_PORT
OpAMP 14320 HDX_CI_OPAMP_PORT

CI Testing Notes:

  • Uses separate Docker Compose configuration (docker-compose.ci.yml)
  • Isolated test environment with unique -p int-<slot> project name
  • Includes all necessary services (ClickHouse, MongoDB, OTel Collector)
  • Tests run against real database instances for accurate integration testing

E2E Testing

E2E tests use the same slot-based isolation pattern as integration tests, with their own dedicated port range (20320-21399) so they can run simultaneously with both the dev stack and CI integration tests.

E2E port mapping (base + slot):

Service Base Port Range Env Variable
OpAMP 20320 20320 - 20419 HDX_E2E_OPAMP_PORT
ClickHouse HTTP 20500 20500 - 20599 HDX_E2E_CH_PORT
ClickHouse Native 20600 20600 - 20699 HDX_E2E_CH_NATIVE_PORT
API server 21000 21000 - 21099 HDX_E2E_API_PORT
MongoDB 21100 21100 - 21199 HDX_E2E_MONGO_PORT
App (local) 21200 21200 - 21299 HDX_E2E_APP_LOCAL_PORT
App (fullstack) 21300 21300 - 21399 HDX_E2E_APP_PORT 
# Run all E2E tests
make e2e

# Run a specific test file (dev mode: hot reload, containers kept running)
make dev-e2e FILE=navigation

# Run a specific test by grep pattern
make dev-e2e FILE=navigation GREP="help menu"

# Grep across all files
make dev-e2e GREP="should navigate"

# Open HTML report after tests finish (screenshots, traces, step-by-step)
make dev-e2e FILE=navigation REPORT=1

# Or call the script directly for more control
./scripts/test-e2e.sh --ui --last-failed

# Override the slot manually
HDX_E2E_SLOT=5 ./scripts/test-e2e.sh
  • A deterministic slot (0-99) is computed from the worktree directory name
  • Each slot gets its own Docker Compose project name (e2e-<slot>) and port range
  • The slot and assigned ports are printed when E2E tests start

Port range safety: E2E has its own dedicated port range (20320-21399) that does not overlap with CI integration tests (14320-40098) or the dev stack (30100-31199), so all three can run simultaneously from the same worktree.

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.mjs, 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/