Hysen Labspnpm
Fast, disk space efficient package manager
pnpm: a package manager built around disk space
A fast, strict, disk efficient package manager that links packages from one content addressable store instead of copying them into every project.
The storage trick
pnpm's design starts from a content addressable filesystem that stores all files from all module directories in a single place on disk. The README illustrates the payoff with lodash: under npm, 100 projects using lodash mean 100 copies on disk. With pnpm, lodash lives in the content addressable storage once, and different versions add only the files that actually differ.
Speed and disk claims
The README calls pnpm up to 2 times faster than the alternatives. Packages are linked from the single store using hard links or reflinks, consuming no additional disk space, which saves gigabytes and shortens installs. A supporting article explains the unique node modules structure in more depth for anyone who wants the mechanics.
Strict and deterministic
The strictness rule lets a package access only the dependencies declared in its own package.json. A lockfile keeps installs deterministic. The README also calls pnpm great for monorepos, which is where teams with many interdependent packages start to feel the difference.
Track record and ports
pnpm works everywhere, with Windows, Linux, and macOS support, and it has been in production use since 2016 by teams of all sizes. A quote from Microsoft describes using pnpm in Rush repos with hundreds of projects. An experimental Rust port includes a CLI implementation named pacquet. Rust is also the primary language of the main repository, and the license is MIT, with the homepage at pnpm.io.
Editorial conclusion
The whole pitch rests on one design decision: store files once and link them everywhere. The strictness rules and monorepo support are what make that approach workable for large teams rather than a curiosity.
Community notes