install: do not auto-install a transitive peer dependency on bun - #39757
install: do not auto-install a transitive peer dependency on bun#39757robobun wants to merge 3 commits into
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A registry package that declares a non-optional peer dependency on bun (for example bun-plugin-tailwind) made bun install pull the npm bun package and its platform binaries into node_modules. The running runtime already satisfies that peer. Treat a remote package's peer dependency named bun as an optional peer, so it is not auto-installed but still binds when bun is installed through a real dependency edge. Fixes #39755
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WalkthroughThe installer now marks peer dependencies named ChangesBun peer dependency handling
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In `@test/cli/install/bun-install-registry.test.ts`:
- Around line 944-947: Strengthen the test assertion near the existing bun
package check to inspect the lockfile and verify that peer-on-bun’s bun peer
resolves to the explicit root dependency bun@1.0.0, rather than only asserting
the installed package metadata. Preserve the current package-file assertion
while adding the lockfile invariant that confirms the peer slot is bound.
- Around line 888-895: Update the bun install subprocess tests around spawn
calls to capture stdout and stderr instead of ignoring them; await both stream
promises together with exited, assert their expected contents before asserting a
successful exit, and only then read generated files. Apply this consistently to
the affected cases near the existing spawn blocks, wiring each failure event to
rejection.
- Around line 874-975: Extend the “peer dependency on bun” coverage with a local
HTTP tarball or Git fixture whose extracted package.json declares
peerDependencies.bun, exercising Package::parse_with_json_impl rather than only
Package::from_npm. Assert that a transitive peer is not auto-installed, while
preserving the existing explicit-root and root-peer installation expectations.
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src/install/lockfile/Package.rstest/cli/install/bun-install-registry.test.tstest/cli/install/registry/packages/bun/bun-1.0.0.tgztest/cli/install/registry/packages/bun/bun-1.1.0.tgztest/cli/install/registry/packages/bun/package.jsontest/cli/install/registry/packages/create-bun-peer-packages.tstest/cli/install/registry/packages/peer-on-bun/package.jsontest/cli/install/registry/packages/peer-on-bun/peer-on-bun-1.0.0.tgz
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Add a folder dependency fixture whose peer on bun goes through the generic package.json parser. Pipe stderr in the new tests and assert it before the exit code. Assert that the optional peer binds to an explicitly installed bun through bun why.
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I reviewed this PR and found no bugs. The implementation looks correct and the tests cover both parse paths plus the root/workspace exemption. Since this hardcodes a package-name special case into the installer's peer-dependency semantics, a maintainer sign-off on the policy would still be worthwhile.
Checked: from_npm is only reached with Features::NPM (is_main/is_workspace both false), so the ungated form there is equivalent to the gated form in parse_with_json_impl. The workspace-entry branch at Package.rs:2895 is intentionally untouched — workspace members keep the old behavior, matching the !is_workspace gate. The short-circuit ordering keeps swap_remove running first, so a peerDependenciesMeta.bun.optional entry is still consumed. Lockfile round-trip is asserted in the first test.
Extended reasoning...
Overview
This PR changes ~7 lines in src/install/lockfile/Package.rs to treat a transitive peer dependency named exactly bun as optional, in two places: the npm-manifest parse path (from_npm) and the generic package.json parse path (parse_with_json_impl, gated on !is_main && !is_workspace). It adds four tests to bun-install-registry.test.ts and three Verdaccio fixture packages (bun@1.0.0/1.1.0, peer-on-bun@1.0.0) plus a generator script.
Security risks
None identified. The change narrows what gets auto-installed rather than widening it — a peer edge that previously pulled a package now leaves it unbound unless something else installs it. No new parsing of untrusted input, no path handling, no network changes. The == b"bun" comparison is an exact byte match on a package name already being processed.
Level of scrutiny
Medium-high. Package-manager dependency resolution is a critical path where silent behavioral drift can break user projects, and this introduces a hardcoded name-based special case. The mechanism itself is low-risk (reuses the existing Behavior::OPTIONAL peer path already exercised by peerDependenciesMeta and --omit=peer), but the policy — that the installer should assume the running runtime satisfies any peer on bun — is a design decision that a maintainer should confirm. Open questions a maintainer might weigh: whether workspace members' own bun peers should also be exempted (currently they are not, deliberately), and whether @types/bun deserves similar treatment.
Other factors
- All prior review threads (CodeRabbit, comment-cop) are resolved: subprocess stdout/stderr are now captured and asserted before exit codes; a folder-dependency test was added to cover the non-registry parse path; the long code comments were shortened to one line each.
- I verified
Features::NPMinheritsis_main: false, is_workspace: falsefrombase(), so the ungatedfrom_npmchange is consistent with the gated generic-path change. - The
||ordering in the generic path keepsoptional_peer_dependencies.swap_removeon the left, so an explicitpeerDependenciesMeta: { bun: { optional: true } }entry is still consumed from the set and does not leak. - Tests follow harness conventions (
bunEnv,bunExe, concurrent pipe drain, exit-code asserted last) and assert the lockfile is byte-stable across reinstall. - The PR description documents the lockfile-reload and dependencies+peerDependencies interaction cases, which I spot-checked against the code.
Deferring because this is a semantic policy carve-out in a core subsystem, not because anything looks wrong.
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Updated 8:26 AM PT - Aug 20th, 2026
✅ @robobun, your commit 353856bcf4aba0f9c9e690410784d6298ff8800e passed in 🧪 To try this PR locally: bunx bun-pr 39757That installs a local version of the PR into your bun-39757 --bun |
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Problem
bun add bun-plugin-tailwindinstalls the npmbunpackage into node_modules: ~80MB of binaries on linux, ~170MB on Windows (bun-plugin-tailwindaddsbunbinary to node_modules #39755).bun why bunshows it comes frompeer bun-plugin-tailwind@0.1.2 (requires >=1.0.0).bun, and nothing tells the installer that the running runtime already satisfies it.Fix
bunas an optional peer. Both parse paths change insrc/install/lockfile/Package.rs: the registry manifest path (from_npm) and the generic package.json path, gated on!is_main && !is_workspace.bunpackage is present through a real dependency edge.bunin the user's package.json (any kind, including a root peer dependency) still installs it.test/cli/install/bun-install-registry.test.ts(newpeer dependency on bunblock, stock bun fails the first test). Also ranbun-lock.test.ts,isolated-install.test.ts,bun-update-transitive.test.ts, and the full registry suite.Background
Behaviorflags.PEER | OPTIONALmeans: bind to the package if something else installs it, otherwise leave the edge unresolved.--omit=peerandpeerDependenciesMeta: { optional: true }already use this path, so lockfile round-trips and hoisting are covered by existing machinery.Featureswhereis_mainandis_workspaceare false. The root and workspace package.json files parse withis_mainoris_workspaceset, so their ownbundependencies keep the old behavior.bun@1.0.0/1.1.0andpeer-on-bun@1.0.0(generator scriptcreate-bun-peer-packages.ts).Notes
bunpeer keeps its resolution on reload: lockfile loads do not reparse manifests, so nothing is removed behind the user's back. A fresh resolve (no lockfile, orbun update) drops it.bunappears in bothdependenciesandpeerDependenciesof the same remote package, the duplicate-promotion loop infrom_npmkeeps the regular dependency, so it still installs.bunpackage would not help anyway.bununderoptionalPeersfor such packages, which keeps reinstalls from a saved lockfile stable (asserted in the test).bun-install.test.tslocally are network tests (bitbucket, gitlab, public tarball URLs) that cannot run in the sandbox, unchanged by this diff.no test proof · iteration 0 · Platform-specific test(s) that do not run on this machine. Deferring to CI, which covers all platforms: test/cli/install/bun-install-registry.test.ts