Zoltan Kochan
ffc51c8f4a
Resolution never reads a patch. It appends the patch file's hash to an already-resolved package id, so a `patchedDependencies` change leaves the set of packages and versions untouched and moves only the affected keys. Rewrite those keys and the references pointing at them instead of re-resolving. `packages:` is keyed without the patch hash, so only `snapshots:`, the importers' resolved versions, and dependents' dependency references move. The patched tarball is already in the store, so materialization applies the patch with no network access, and the new depPath puts the package in a fresh virtual-store slot so an install script reruns against the patched sources. Fall back to the resolver when the patched package is reachable as a peer (its depPath is embedded in dependents' peer suffixes), when a peer suffix was shortened into a hash and cannot be inspected, when the new configuration would leave a patch unused while `allowUnusedPatches` is off, and when a patch file cannot be read. Implemented in both the TypeScript CLI and pacquet. Related to pnpm/pnpm#13474.
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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.