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* fix: cap lockfile verification memory and add trustLockfile opt-out Verifying a multi-thousand-entry lockfile against `minimumReleaseAge` or `trustPolicy: no-downgrade` retained every fetched packument in a per-install cache for the entire install. On large workspaces this OOM'd CI runners with a 2GB heap cap. Project both caches down to just the fields each check reads (per-version trust evidence + the `time` map for trust; package-level `modified` + version-name set for the abbreviated shortcut) so the bulk packument is GC'd as soon as the fetch returns. Also adds a `trustLockfile` setting (default `false`) that skips the verification pass entirely for environments where the lockfile is already part of the trusted base. Mirrored in pacquet. Closes #11860. * perf: share resolver packument cache with the lockfile verifier The verifier kept its own per-install dedup Maps and re-fetched every packument the resolver had already pulled during the same install. Plumb the resolver's per-install `PackageMetaCache` through to the verifier (via `createNpmResolutionVerifier` / `build_resolution_verifiers`) so a name already in the resolver's LRU short-circuits the verifier's disk/network round-trip — fast path only, the cached document is projected for the trust check so the verifier's memory footprint stays bounded. In pnpm, `installing/client` now constructs one LRU and hands it to both `createResolver` and `createResolutionVerifiers`. In pacquet, the `InMemoryPackageMetaCache` is lifted to `Install::dispatch` and passed to both `build_resolution_verifiers` and `InstallWithFreshLockfile`.
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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:
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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:
