Migrate a repo from npm or yarn to pnpm by converting the existing lockfile with pnpm import
domain: pnpm.io · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
If the repo uses npm/yarn workspaces, first declare the same package globs in a pnpm-workspace.yaml — pnpm import requires workspaces to be declared beforehand and won't auto-detect them.
Run pnpm import in the project root: it generates pnpm-lock.yaml from the existing lockfile, supporting package-lock.json, npm-shrinkwrap.json, and yarn.lock — preserving the resolved dependency versions.
Delete the old lockfile and run pnpm install to build node_modules from pnpm-lock.yaml.
Move any npm config that isn't auth/registry out of .npmrc into pnpm-workspace.yaml (camelCase names) — on pnpm 11, .npmrc is only read for auth and registry settings.
Run your build and tests: pnpm's strict, symlinked node_modules means code that imported undeclared transitive dependencies (phantom deps) will now fail and must add those deps explicitly.
Docs: https://pnpm.io/cli/import
Known gotchas
pnpm import does not delete the old lockfile — remove package-lock.json/yarn.lock yourself or tools may keep resolving against them.
Phantom-dependency breakage is the #1 migration failure: pnpm's default isolated layout only exposes declared dependencies.
On pnpm 10/11 the first install will likely block dependency postinstall scripts by default — expect to run pnpm approve-builds (see https://pnpm.io/cli/approve-builds).
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