Lazizbek ErgashevandZoltan Kochan
ccff620f66
Merging git branch lockfiles unions their keys, so a dependency that the main branch removed after a branch lockfile was written comes back in the merged result. Resolution normally prunes it again, but --frozen-lockfile skips resolution and fails the manifest check with ERR_PNPM_OUTDATED_LOCKFILE. Once the branch lockfiles are merged, prune each importer back to what its manifest declares. The declared names are derived per dependency group the way satisfiesPackageManifest derives them, so a dependency that moved between groups is reconciled rather than left in both. Only a peer that no other field declares is auto-installed, so a dependency listed in both devDependencies and peerDependencies keeps the field that declares it rather than being dropped from it. Pruning importer edges can strand packages, so the merged lockfile then goes through pruneSharedLockfile. The Rust CLI merges branch lockfiles the same way and had the same bug. It gets the same reconciliation, hooked into the install pipeline because the lazily loaded wanted lockfile has no access to the project manifests at load time. Fixes pnpm/pnpm#13966. --------- Co-authored-by: Zoltan Kochan <z@kochan.io>
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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.