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- Keep the pre-run check read-only: pnpm's run path never writes pnpm-lock.yaml (only the install command restores it from the current lockfile), so the gate now uses a read-only stand-in check instead of regenerate_wanted_lockfile_if_missing, and a missing lockfile without a stand-in reports "Cannot find a lockfile" like pnpm instead of passing silently. - Match pnpm's env-var semantics for unrecognized values: pnpm assigns pnpm_config_verify_deps_before_run verbatim without validation, so a present-but-invalid value is truthy there (check runs, no action matches). Parse failures now map to VerifyDepsBeforeRun::True instead of being dropped, which also keeps a present env var overriding the CLI consistently. - Report "cannot check" straight from the missing workspace state, before the workspace-projects walk, sparing fresh projects the discovery cost on every run/exec. - Share the recursion-guard env-var name through a constant, cover the exec-path stamp with a test, and drop a test doc comment that only restated the assertions. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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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.