Node.js / TypeScript Toolchain

Common commands for Node.js and TypeScript projects.

Package managers

# Detect which package manager is used
[ -f pnpm-lock.yaml ] && echo "pnpm" || ([ -f yarn.lock ] && echo "yarn" || echo "npm")

npm install          # or: pnpm install / yarn
npm ci               # Clean install (CI)
npm install lodash   # Add dependency
npm install -D vitest # Add dev dependency

Run scripts

npm run build
npm run dev
npm test
npm run lint

Testing

# Jest
npx jest --coverage
npx jest --watch
npx jest path/to/test.ts

# Vitest
npx vitest run
npx vitest run --coverage
npx vitest path/to/test.ts

# Node test runner (built-in)
node --test src/**/*.test.ts

Linting & formatting

npx eslint . --fix
npx prettier --write .
npx biome check --write .

TypeScript

npx tsc --noEmit               # Type check only
npx tsc --noEmit --watch        # Watch mode
npx tsc --showConfig            # Show resolved config
npx tsx src/script.ts            # Run TS directly

Debugging

node --inspect-brk dist/index.js   # Debug with breakpoint
node --enable-source-maps dist/index.js  # Enable source maps

Dependencies

npm outdated                    # Check for updates
npm audit                       # Security audit
npm ls --depth=0                # List top-level deps
npx depcheck                    # Find unused deps

Monorepo (Turborepo / Nx)

npx turbo run build
npx turbo run test --filter=my-package
npx nx run my-app:build

Notes

• Check package.json scripts section for project-specific commands.
• Use npx to run locally-installed binaries without global install.
• Prefer npm ci over npm install in CI environments.