4ef289f3d3
pnpm/pnpm#12570 added, to the tarball *serve* path, a packument load + full JSON parse (to derive the expected integrity) plus a sidecar read and a conditional re-hash — on every request, before the cache lookup. Pre-#12570 a cached/proxied tarball was streamed straight from disk with none of that. On a warm proxy cache that per-serve work is the cold-store regression, not the cache-miss buffering: the integrated benchmark serves from a warm pnpr cache, so the streaming-tee change alone moved nothing. Take the cache lookup first and trust the integrity sidecar: when a cached tarball has a sidecar whose recorded length matches the file, the bytes were already verified against the packument integrity when they were stored (the cache-miss tee only promotes on an SRI match), so serve them directly without re-loading or re-parsing the packument and without re-hashing. The packument is now resolved lazily — only for a cache entry lacking a trustworthy sidecar (verified once, then the sidecar is recorded) and for cache misses (the verified fetch needs it). The client still verifies the bytes it installs against its own resolved integrity, so the proxy guards what it writes, not every read.
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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.