Fetch packages from a lockfile into virtual store, package manifest is ignored.
This is an experimental command. Breaking changes may be introduced in non-major versions of the CLI.
This command is specifically designed to boost building a docker image.
You may have read the official guide to writing a Dockerfile for a Node.js app, if you didn't read it yet, you may want to read it first.
From that guide, we learn to write an optimized Dockerfile for projects using pnpm, which shall look like
As long as there is no change to
.pnpmfile.cjs, docker build cache is still valid up to the layer of
RUN pnpm install --frozen-lockfile --prod, which cost most of the time
when building a docker image.
However, modification to
package.json may happen much more frequently than
we expected, because it does not only contain dependencies, but may also
contain the version number, scripts, and arbitrary configuration for any other
It's also hard to maintain a Dockerfile that build a monorepo project, it may look like
As you can see, the Dockerfile has to be updated when you add or remove sub-packages.
pnpm fetch will solve the above problem perfectly by providing the ability
to fetch package to virtual store with information only from a lockfile.
It works for both simple project and monorepo project,
pnpm not to communicate with package registry as all needed packages shall be
already presented in the virtual store.
As long as the lockfile is not changed, the build cache is valid up to the
RUN pnpm install -r --offline --prod, which will save you much
Only development packages will be fetched
Development packages will not be fetched