packy

packy turns one npm package reference into a single .tgz archive that can help install packages on a machine without registry access.

one package reference
        │
        ├─ prepare   isolated workspace
        ├─ install   npm install --ignore-scripts --install-strategy=nested
        ├─ patch     bundle dependencies, neutralize lifecycle hooks
        ├─ pack      npm pack --ignore-scripts --json
        └─ capture   read the tarball bytes
        ▼
one archive + the identity npm actually packed

Authoring an archive requires registry access. Offline installation requires all necessary dependencies and artifacts to be available locally. npm bundles the resolved dependency tree, including required peer dependencies. Optional peers stay optional. Native binaries or other external resources may require additional preparation. The recommended install command disables lifecycle scripts with --ignore-scripts; packages that rely on those scripts may not work. Verify each archive and its requirements before relying on it in an air-gapped environment.

• Search the npm registry and choose exactly one package version.
• Resolve the dependency tree with npm inside WebContainers.
• Pack a single archive with npm's own filename and identity.
• Download the archive and install it locally, with the required dependencies available.

• Svelte 5
• TypeScript
• Vite
• Bootstrap 5
• SvelteStrap
• WebContainers

packy runs in a modern browser and relies on cross-origin isolation for WebContainer support (COOP/COEP headers in development, the bundled service worker on static hosting).

bun install
bun run dev

bun run test       # fmt, lint, knip, typecheck, unit
bunx playwright install chromium  # once, for browser tests
bun run test:browser
bun run build

• src/lib/core/ — framework-free pipeline: input normalization, workspace manifest, manifest patching, pack-output parsing, bounded logging, and the runBundle orchestrator.
• src/lib/runtime/ — WebContainer adapter and an in-memory fake for tests.
• src/components/ — Svelte UI built with Bootstrap 5 and SvelteStrap.

The core has no DOM, network, or filesystem access. The caller owns the Blob URL and the download UI.