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Model every addressable registry origin in pnpr as a registry mount at /~<mount>/: a pnpr-hosted organization registry, a single-origin upstream, and a router mapping package-name patterns to one concrete source. Provenance is declared, never inferred — no configuration can express a cross-origin fall-through. Full replacement of the legacy Verdaccio-shaped model. New `mount` module: a decidable PackagePattern language with a covers() superset relation; first-match authoritative resolution; and Mounts::validate, which rejects shadowed/unreachable routes (including a non-last catch-all), duplicate patterns, and unknown/self/non-concrete sources at config load. mounts:/defaultTarget: is the only routing surface; uplinks:, packages: proxy: fallback chains, hosted-first serving, and multi-uplink tarball fallback are removed. Path-less and write requests route through the mount graph; a router no-route is a 404 with no fall-through and a down source errors rather than 404s. Served tarball URLs stay canonical for the client's base. Per-package ACLs apply on every mount-served read. Each hosted-org mount has its own storage namespace (local dir and S3/R2) so two orgs hosting the same name@version cannot collide; the org is threaded through staging, commit, and the publish journal so crash recovery lands in the right org. Public upstream mounts use a stable, secret-free cache namespace. The bundled config.yaml and the integrated-benchmark mock config are converted to the mount model; registry-mock keeps working with no task or seed changes. Implements the pnpr side of RFC pnpm/rfcs#13 only; lockfile registry-identity changes for the TypeScript CLI and pacquet are out of scope.
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Fast, disk space efficient package manager:
- Fast. Up to 2x faster than the alternatives (see benchmark).
- Efficient. Files inside
node_modulesare linked from a single content-addressable storage. - Great for monorepos.
- Strict. A package can access only dependencies that are specified in its
package.json. - Deterministic. Has a lockfile called
pnpm-lock.yaml. - Works as a Node.js version manager. See pnpm runtime.
- Works everywhere. Supports Windows, Linux, and macOS.
- Battle-tested. Used in production by teams of all sizes since 2016.
- Experimental Rust port. Includes pacquet, an experimental port of the CLI written in Rust.
- See the full feature comparison with npm and Yarn.
To quote the Rush team:
Microsoft uses pnpm in Rush repos with hundreds of projects and hundreds of PRs per day, and we’ve found it to be very fast and reliable.
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Background
pnpm uses a content-addressable filesystem to store all files from all module directories on a disk. When using npm, if you have 100 projects using lodash, you will have 100 copies of lodash on disk. With pnpm, lodash will be stored in a content-addressable storage, so:
- If you depend on different versions of lodash, only the files that differ are added to the store.
If lodash has 100 files, and a new version has a change only in one of those files,
pnpm updatewill only add 1 new file to the storage. - All the files are saved in a single place on the disk. When packages are installed, their files are linked from that single place consuming no additional disk space. Linking is performed using either hard-links or reflinks (copy-on-write).
As a result, you save gigabytes of space on your disk and you have a lot faster installations!
If you'd like more details about the unique node_modules structure that pnpm creates and
why it works fine with the Node.js ecosystem, read this small article: Flat node_modules is not the only way.
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Getting Started
Benchmark
pnpm is up to 2x faster than npm and Yarn classic. See all benchmarks here.
Benchmarks on an app with lots of dependencies:
License
MIT, except the pnpr/ directory, which is source-available under the PolyForm Shield License 1.0.0.