Summary & Key Takeaways ​

• Store Runtime Changes: Dependencies are now linked from a global virtual store.
• Optimized Index Format: Uses hex digests for file entries and stores hash algorithms once, improving lookup performance.
• SQLite for Package Index: Replaces individual JSON files with a single SQLite database for metadata, reducing I/O and improving space efficiency.
• Bundled Manifests: Package manifests are stored directly in the index, eliminating package.json reads during resolution.
• Global Virtual Store: pnpm add -g and pnpm dlx now use a global virtual store by default.
• Isolated Global Packages: Each globally installed package gets its own isolated directory, preventing conflicts.

Our Commentary ​

This is a pretty big deal for pnpm users, and honestly, for anyone in the Node.js ecosystem who cares about package management. The shift to SQLite for the package index is a fascinating move. We've seen similar patterns in other tools trying to optimize I/O, and it makes a lot of sense for something as I/O-heavy as a package manager. "isolated global packages" feature - that's a really good idea. I wrestled with global package conflicts way too many times already. It's still a beta, of course, but the direction pnpm is taking here feels genuinely innovative and addresses some long-standing pain points.