* fix: detect reverted catalog entries on install After an update bumped a catalog entry in pnpm-workspace.yaml, the workspace state cache stored the pre-update catalog versions, so reverting the entry back to its original version was reported as "Already up to date" instead of reinstalling the previous version. Fold the catalogs written during the install into the catalogs recorded in the workspace state so a later install detects the reverted entry as outdated. Closes https://github.com/pnpm/pnpm/issues/12418 * fix: harden catalog merge against prototype pollution and entry loss Address review feedback on the catalog-merge helper: - mergeCatalogs now builds null-prototype records and copies entries with Object.defineProperty, so a catalog or dependency name like __proto__ (which can flow in from parsed pnpm-workspace.yaml) becomes an ordinary own property instead of corrupting the result's prototype. - The recursive per-project install path now accumulates updatedCatalogs with mergeCatalogs instead of a shallow Object.assign, so two projects updating different entries of the same catalog no longer clobber each other.
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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.
- 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.