Development setup

Requirements: Node.js 24.18.0 and npm 12.0.2. The application runtime supports Node.js 24 or later.

npm ci

Core commands

Command	What it does
npm run dev	Starts the Vite dev server
npm run build	Production build
npm run test	Vitest, interactive
npm run test:run	Vitest, single run
npm run lint	Biome lint across src, shared, electron/main, worker, echo, echo-local, cli, extension/chrome, extension/vscode, tests, scripts
npm run format	Biome format, write mode
npm run architecture:check	Enforces runtime dependency directions, cycles, and file-size ratchets
npm run validate	The full gate: static/type/architecture checks, root and workspace tests with coverage, all production builds, Electron runtime-import verification, and size budgets

The type-check vs type-check:all gotcha

npm run type-check runs tsc --noEmit against the root tsconfig.json only. That config’s exclude array is:

["node_modules", "dist", "out", "worker", "electron/main", "cli", "extension", "docs-site"]

Caution

A green npm run type-check tells you nothing about whether worker/, electron/main/, cli/, extension/, or docs-site/ actually compile — they’re all excluded from that command’s scope.

npm run type-check:all is the command that actually covers them: it runs the base renderer check, the TypeScript-tooling and checked-JavaScript ratchets, five more tsc --noEmit -p <tsconfig> project builds (electron/tsconfig.json, src/features/http/tsconfig.json, worker/tsconfig.json, echo/tsconfig.json, echo-local/tsconfig.json), plus the CLI, Chrome extension, and VS Code workspace type-checks. npm run validate — and CI — use type-check:all, not the plain type-check.

Related

• Testing overview
• Contributing overview