Use pnpm for optimized dependency management and monorepo support

[sam-b-rose]

pnpm is an alternative package manager for Node.js. It is a drop-in replacement for npm, but faster and more efficient (3 times faster – see benchmarks.

📺 Yarn vs pnpm comparison

pnpm has all the additional features that Yarn has over npm:

1. security. Like Yarn, pnpm has a special file with all the installed packages’ checksums to verify the integrity of every installed package before its code is executed.
2. offline mode. pnpm saves all the downloaded package tarballs in a local registry mirror. It never makes requests when a package is available locally. With the --offline parameter, HTTP requests can be prohibited at all.
3. speed. pnpm is faster than npm and Yarn (both with cold and hot cache). Yarn copies files from cache whereas pnpm just links them from the global store.

[aaronccasanova]

Let's track RFC 0042-isolated-mode.md. Looks like npm might have a pnpm like installation mode on their roadmap.

[BPScott]

It'd also be interesting to see how yarn v3 holds up. Admin-web-platform would be interested in any comparison of modern package managers, as any thing learned could also be applied to our package monorepos (web-configs / quilt / sewing-kit)

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