install: keep a bundle's dependency out of a slot the bundling package resolves through - #38848
install: keep a bundle's dependency out of a slot the bundling package resolves through#38848robobun wants to merge 6 commits into
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…e resolves through The dependencies of a bundled dependency hoist no further than the bundling package's node_modules. hoist_dependency placed them there without looking at what that folder is already used for: the bundling package itself, and the regular dependencies nested inside it, resolve their own edges up through the same folder, and a loaded bun.lock rebinds those edges by walking up the saved paths. So when the bundle's copy was a different version than the one those edges resolve to above, the lockfile written by a fresh install rebound them to the bundle's copy on every later install. Before placing at a bundle's hoist root, check the edges of the bundling package and of the regular dependencies nested under it for the same name; if one of them resolves to a different package (or is unresolved), nest the dependency next to its dependent instead, as for any other conflict. Placing the same package again stays allowed, so bundles that merely repeat a root package keep their shape.
WalkthroughChangesThe lockfile hoister now detects bundled dependencies that would shadow non-bundled resolutions. New registry fixtures and install tests cover hoisted, isolated, nested, optional-peer, frozen, and lockfile-only scenarios. Bundled dependency resolution
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CI (build 97274): every build and test job that ran passed, including |
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Found 1 issue this PR may fix:
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Updated 11:05 PM PT - Aug 14th, 2026
❌ @robobun, your commit d9c2e84 has some failures in 🧪 To try this PR locally: bunx bun-pr 38848That installs a local version of the PR into your bun-38848 --bun |
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Inline comments:
In `@src/install/lockfile/Tree.rs`:
- Around line 1143-1198: Optimize hoist_root_resolves_elsewhere by eliminating
the per-call scope Vec allocation and linear scope.iter().find lookup during the
descendant scan. Reuse an existing Builder scratch buffer or add an appropriate
reusable marker/lookup keyed by tree ID, while preserving the current descendant
ownership and bundled-dependency semantics. Keep the change scoped to this scan
and stop early at the hoist-root boundary only if the tree ordering guarantee
supports it.
In `@test/cli/install/bun-lock.test.ts`:
- Around line 1441-1470: Add an assertion in the isolated-linker test around
sharedLinkedIntoHost that locates the bundled-shadow-inner package’s nested
bundled-shadow-shared copy using the actual store layout, verifies its version
remains 2.0.0, and confirms it is not promoted or linked into the
bundled-shadow-host entry. Keep the existing host-link assertion and
frozen-lockfile coverage intact.
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- Push a commit to this branch (recommended)
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📒 Files selected for processing (26)
src/install/lockfile/Tree.rstest/cli/install/bun-lock.test.tstest/cli/install/registry/packages/bundled-shadow-consumer/bundled-shadow-consumer-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-consumer/bundled-shadow-consumer-2.0.0.tgztest/cli/install/registry/packages/bundled-shadow-consumer/package.jsontest/cli/install/registry/packages/bundled-shadow-deep-host/bundled-shadow-deep-host-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-deep-host/package.jsontest/cli/install/registry/packages/bundled-shadow-host/bundled-shadow-host-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-host/package.jsontest/cli/install/registry/packages/bundled-shadow-inner/bundled-shadow-inner-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-inner/package.jsontest/cli/install/registry/packages/bundled-shadow-mid/bundled-shadow-mid-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-mid/bundled-shadow-mid-2.0.0.tgztest/cli/install/registry/packages/bundled-shadow-mid/package.jsontest/cli/install/registry/packages/bundled-shadow-peer-host/bundled-shadow-peer-host-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-peer-host/package.jsontest/cli/install/registry/packages/bundled-shadow-peer-inner/bundled-shadow-peer-inner-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-peer-inner/package.jsontest/cli/install/registry/packages/bundled-shadow-peer-leaf/bundled-shadow-peer-leaf-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-peer-leaf/package.jsontest/cli/install/registry/packages/bundled-shadow-shared/bundled-shadow-shared-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-shared/bundled-shadow-shared-2.0.0.tgztest/cli/install/registry/packages/bundled-shadow-shared/package.jsontest/cli/install/registry/packages/bundled-shadow-wrapper/bundled-shadow-wrapper-1.0.0.tgztest/cli/install/registry/packages/bundled-shadow-wrapper/package.jsontest/cli/install/registry/packages/create-bundled-shadow-packages.ts
…r is nested there Bundles usually nest nothing but bundled packages in the bundling package's node_modules, so checking those entries first lets the common case skip the pass over the tree list (and its allocation). The isolated test also checks the bundled copy of the dependency.
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#29263 is this bug ( Since the first push: the comments in |
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I reviewed this PR and didn't find any bugs. Because it changes the lockfile hoisting algorithm — a subtle, load-bearing part of bun install whose correctness depends on invariants about tree ordering and which packages resolve through a hoist root — a human look from someone familiar with the install code would still be worthwhile.
What was reviewed
- The new
hoist_root_resolves_elsewhereguard: verifiedExternalSlice::containsis a range check, the!AS_DEFINEDgate is sound (the initial call'snext_idcan never equalhoist_root_id), and theparent == INVALID_IDguard prevents indexingresolutions[ROOT_DEP_ID]. - Confirmed Filter-mode never sets a hoist root (bundled edges are dropped by
is_filtered_dependency_or_workspace), so only the saved tree is affected. - The four new tests cover host's own edge, isolated linker, a nested regular dep's edge, and a late-bound optional peer; fixtures are hermetic and the generator script matches the committed registry metadata.
Extended reasoning...
Overview
This PR fixes #29263 by adding a guard in Tree::hoist_dependency (src/install/lockfile/Tree.rs): before placing a bundle's transitive dependency at the bundle's hoist root, a new helper hoist_root_resolves_elsewhere checks whether the bundling package itself, or any of its regular (non-bundled) dependencies nested under it, resolves the same name to a different package. If so the placement is treated as a conflict (DependencyLoop) so the dependency nests one level deeper instead of shadowing what the bundling package would resolve on a lockfile reload. The rest of the diff is test scaffolding: ten new bundled-shadow-* registry fixture packages, a generator script, and four new tests in bun-lock.test.ts.
Security risks
None identified. The change reads from already-resolved lockfile buffers and only affects where entries are placed in the saved tree. No untrusted input parsing, no filesystem writes outside the existing install path, no credential or network handling.
Level of scrutiny
High. The hoisting algorithm determines what bun.lock records and therefore what every subsequent install (including --frozen-lockfile) lays out. A wrong placement here silently gives users the wrong package version, which is exactly the bug being fixed. The new helper walks the tree list relying on breadth-first append order ("a tree comes after its parent"), distinguishes regular vs. bundled entries at the hoist root via resolution_lists[owner].contains(dep_id), and deliberately excludes packages hoisted into the root from inside the bundle. These are the right invariants per the PR description, but they are subtle enough that someone who owns this code should confirm them — in particular that nested_in correctly identifies exactly the set of packages whose resolution walks pass through the hoist root rather than stop at it, and that the descendant scan's ownership check (resolution_lists[parent_owner].contains(tree.dependency_id)) doesn't miss trees created via peer-dep hoisting or ResolveReplace.
Other factors
- Test coverage is strong: four scenarios (host's own edge, isolated linker, nested-dep edge, late-bound optional peer), each asserting both the lockfile shape and the on-disk layout across fresh install, reinstall,
--frozen-lockfile, and--lockfile-only. The PR states all four fail on the released binary and the arborist migration snapshots are unchanged. - All prior review comments (comment-cop verbosity, CodeRabbit's per-call allocation concern, the isolated-linker assertion gap) are resolved in the current diff.
- The uncommon-case descendant walk still allocates a
Vecper call and does a linearscope.iter().find; this was accepted after restructuring so the common case (no regular deps nested at the hoist root, which covers real bundles like npm/fsevents/nyc) skips it entirely.
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On the two points worth a human's confirmation, the reasoning is now written out in the description (collapsed section at the end). Short version:
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Problem
repro-uses-bundleddepends onis-number@^7and bundlesrepro-bundled, which needsis-number@^3;bun.lockends up withrepro-uses-bundled/is-number=3.0.0, andbun whyshowsis-number@7.0.0with no dependents). Fixes bun.lock resolves wrong version for dependencies of packages with bundledDependencies #29263.bun.lock(secondbun install,--frozen-lockfile, fresh clone), hoisted and isolated alike. The install that wrote the lockfile is correct, so nothing warns.hostdepends onshared@1(hoisted to the root) and bundlesinner, which depends onshared@2. The fresh install writes"host/shared": shared@2.0.0. Loading that lockfile resolves host's ownsharededge by walking up the saved paths, findshost/sharedfirst, and binds host toshared@2, outside its declared range.--frozen-lockfilethen exits 0 and installsnode_modules/host/node_modules/shared@2.0.0(isolated: links host's store entry againstshared@2.0.0).Tree::hoist_dependency(src/install/lockfile/Tree.rs) stops walking up at the bundle's hoist root (the bundling package'snode_modulestree) and places the dependency there unconditionally. That folder is also the one the bundling package itself, and any regular dependency nested inside it, resolve through on their way up, and nothing checked what they resolve the name to.ResolveReplacetriggers the re-hoist inLockfile::resolve, and the second pass takes the same placement path), and when the edge being shadowed belongs to a regular dependency nested under the bundling package rather than to the package itself.bundledDependenciesthe walk continues to the root, finds the conflicting version there and nests the dependency next to its dependent, which is why only bundles are affected.Fix
Tree::hoist_root_resolves_elsewherelooks at the edges for that name belonging to the bundling package and to the regular (non-bundled) dependencies nested in itsnode_modules, and theirs, and so on. If any of them resolves to a different package (or is unresolved), the placement is treated like any other conflict:DependencyLoop, so the dependency nests next to the package that depends on it (host/inner/shared).npm/fsevents@1shape, covered by the existingnpm-1/debug-1test and the arborist migration fixtures) keep their current lockfile shape. Packages placed at the hoist root from inside the bundle are deliberately not consulted: their walks stop at the hoist root, so they never resolve past it, and consulting them would move valid placements in real bundles (visible as churn in theaudit-omit/audit-fix-old-tapmigration snapshots with a cruder check).Lockfile::resolvehoists again with the binding known and the bound package goes through the check.test/cli/install/bun-lock.test.ts, four new tests (host's own edge, same under the isolated linker, an edge of a dependency nested under the host, and the late-bound optional peer variant) on newbundled-shadow-*fixtures generated byregistry/packages/create-bundled-shadow-packages.ts. All four fail on the released binary ("host/shared": shared@2.0.0inbun.lock,shared@2.0.0linked/installed into host on reinstall) and pass with this change.bun-lock.test.ts(snapshots unchanged),bun-lockb,lockfile-version-2,lockfile-only,frozen-lockfile-pruned,hoist,migration/migrate.test.ts(arborist snapshots unchanged),migration/pnpm-lock-v9, thebundledDependenciesblock ofbun-install-registry.test.ts, and the bundled tests inbun-audit,bun-dedupe,bun-pm-licenses,bun-prune,bun-update-transitive.Background
bun.lockstores packages keyed by their position in a hoisted tree (a/bmeansbinstalled ina'snode_modules). Dependency edges are not stored; when the lockfile is loaded, each edge is resolved by walking up from the dependent's key (a/b/x, thena/x, thenx) and taking the first hit, like Node's own resolution. The saved tree is therefore only correct if every package's edges resolve to the right entry along that walk.Tree::process_subtree/hoist_dependency(BuilderMethod::Resolvablefor the tree that gets saved). Each dependency walks up from its dependent'snode_moduleslooking for an entry with the same name: same package means dedupe, a different package means nest next to the dependent, no entry anywhere means place at the top of the walk.bundledDependenciesin the bundling package's manifest) ships inside the bundling package's tarball. Bun still resolves it and its dependencies so they appear in the lockfile, but they are placed in their own scope: the bundling package'snode_modulesbecomes a hoist root (FillItem::hoist_root_id) that their walks stop at, which is the placement this change guards. The installer never lays these entries out itself (is_filtered_dependency_or_workspacedrops bundled edges); the tarball contents are what gets installed.Resolve), or a later walk binds it when it hits the unbound slot (ResolveReplace). The latter setslate_bound_optional_peer, andLockfile::resolverebuilds the tree until a pass binds nothing new, so that a fresh install builds the same tree as a reload, where every binding is known up front.Why the entry classification in
hoist_root_resolves_elsewhereis exactnode_modules, their own dependencies nested in theirs, and so on. Everything else placed under the hoist root got there from a walk bounded at the hoist root (the bundled dependencies themselves, and what hoists up from inside the bundle), and their subtrees inherit that bound (FillItem::hoist_root_id), so nothing below them resolves past it either.Placementarm ofprocess_subtree, and a placement lands either at the dependent's ownnode_modules(dependency id inside the dependent's range), at the root, or at the walk's hoist root (dependency id of a package inside the bundle, so outside the owner's range). Soresolution_lists[owner].contains(dep_id) && !bundledpicks out exactly the first group, for any edge kind: peer edges take the same walk and either dedupe (no entry) or nest at the dependent.FillItem::dependency_id), which is what the descendant scan keys on. Trees are appended after their parents, so one pass in id order sees a parent before its children; the scan cannot stop early because unrelated trees are interleaved (breadth-first).ResolveReplaceis the one thing that rewrites an entry in place (it swaps in the dependency id of the walk that bound the peer, possibly a package from outside the bundle). It also setslate_bound_optional_peer, soLockfile::resolveruns another pass in which that peer is bound up front and placed by its own walk like any other edge; the tree of a pass that did aResolveReplaceis never the one kept.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-lock.test.ts