install: dedupe a transitive wide range onto a root/workspace range across majors - #34336
install: dedupe a transitive wide range onto a root/workspace range across majors#34336robobun wants to merge 4 commits into
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WalkthroughChangesThe installer now tracks exact and workspace dependencies as local pins. Lockfile deduplication uses these pins to protect locally appended packages. Root and workspace regression tests verify compatible cross-major hoisting and lockfile reuse. Local Pin Hoisting
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Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change is merge-ready after normal checks and review; the remaining concern is limited to improving assertion order in the new tests, with no actionable merge-blocking risk. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Updated 11:05 PM PT - Aug 14th, 2026
❌ @robobun, your commit e4d4528 has some failures in 🧪 To try this PR locally: bunx bun-pr 34336That installs a local version of the PR into your bun-34336 --bun |
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Found 3 issues this PR may fix:
🤖 Generated with Claude Code |
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Checked the three suggested issues above: all predate the floor guard this PR scopes (it was introduced in the 1.4 Rust port) and none are cross-major dedupes.
Leaving them unlinked so they do not auto-close on merge. |
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I didn't find any bugs, but this changes package-resolution/lockfile dedupe semantics in bun install — worth a human look given how widely that path is exercised.
Checked: the exact_pinned → local_pinned rename is complete (no stale references); the new is_workspace_dependency call reads lockfile.packages via a shared borrow disjoint from the by-value package and the subsequent mark_local_pin mut borrow; the two new tests drain pipes concurrently and assert no nested node_modules before exit code. The verdaccio 0.0.0.0 bind is test-infra only.
Extended reasoning...
Overview
This PR broadens the exemption bitset for Lockfile::get_package_id's order-independence guard so that packages appended for a root/workspace-declared dependency (not just exact =X.Y.Z pins) are eligible dedupe targets for transitive wide ranges across majors. The mechanical change is a rename (exact_pinned → local_pinned, mark_exact_pin → mark_local_pin) plus one new predicate call (is_workspace_dependency(dependency_id)) at the append site in get_or_put_resolved_package_with_find_result. It also adds two registry tests and binds the verdaccio test harness to 0.0.0.0.
Security risks
None identified. This is dependency-resolution bookkeeping; no untrusted-input parsing, auth, or filesystem-path handling is added. The verdaccio bind change is confined to a locally-forked test registry on an ephemeral port.
Level of scrutiny
High. bun install's dedupe/hoist logic determines what ends up in bun.lock and node_modules for every user. The load-bearing correctness claim — that root/workspace dependencies are enqueued deterministically before any network-ordered transitive, so deduping onto them cannot flake — is well-argued in the PR description and consistent with the surrounding guard's design, but it's a semantic invariant about enqueue ordering that a reviewer familiar with the resolve pipeline should confirm. The PR also states the "text lockfile is hoisted" snapshot is unchanged, which is the concrete evidence that the guard's original purpose is preserved.
Other factors
The unsafe raw-pointer split for the new is_workspace_dependency call follows the same pattern as the surrounding code (shared borrow of lockfile reading packages, disjoint from the by-value package and the later mut borrow of local_pinned). is_workspace_dependency linearly scans all packages per call; this runs once per newly-appended package so worst case is O(packages × workspaces) — likely negligible next to network I/O but worth a maintainer nod. The rename is complete (grep confirms no remaining exact_pinned/mark_exact_pin references). Tests cover both root and workspace variants, verify the second install doesn't rewrite the lockfile, and follow the file's existing conventions.
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CI on build 73776: The remaining reds are unrelated to this diff (none exercise
All three are already tracked as main breaks; the rest of the annotation list passed on retry. Ready for review. |
…cross majors The order-independence guard in Lockfile::get_package_id refuses to dedupe a wide range (*, >=X) onto an existing lower-major entry when the manifest's best-match is a different major. This is correct when the existing entry was appended for a network-ordered transitive dependency (the "text lockfile is hoisted" flake), but it was firing for entries appended for root/workspace dependencies too. Those are read from disk and enqueued before any transitive manifest can push onto the same task queue, so deduping onto them is already deterministic and is what both npm and bun 1.3.x do. Real-world impact: a fresh jest + ts-jest + @types/node@^20 install went from 1 to 17 copies of @types/node (63M -> 107M node_modules). Broaden the guard's existing exact_pinned exemption (renamed to local_pinned) to also cover packages appended for a dependency declared in any local package.json (root or workspace), using Lockfile::is_workspace_dependency at the append site. The guard now fires only when the existing entry was appended for a transitive range in this session, which is the actual flake condition.
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Additional findings (outside current diff — PR may have been updated during review):
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🟡
src/install/PackageManager/PackageManagerEnqueue.rs:2143-2149—is_workspace_dependencylinearly scans all packages (lockfile.rs:775, carries a// TODO make this fastercomment); calling it on every appended npm package turns the previously O(1) pin check into O(N²) tag comparisons over a fresh resolve. It's cheap in wall-clock terms (contiguous SoA scan, tens of ms at 10k packages), but the caller already knows the parent package — checking whether that parent's resolution tag isRoot/Workspacewould keep this O(1). At minimum, swapping the||operands lets the O(1) exact-pin test short-circuit first.Extended reasoning...
What changed
Before this PR the pin check at the append site was:
if version.tag == dependency::version::Tag::Npm && version.npm().version.is_exact() {
which is O(1). It is now:
unsafe { &*(*this_ptr).lockfile }.is_workspace_dependency(dependency_id) || (version.tag == dependency::version::Tag::Npm && version.npm().version.is_exact())
is_workspace_dependency→get_workspace_pkg_if_workspace_dep(src/install/lockfile.rs:775-790) iterates over all packages currently inself.packages, comparing each one'sresolution.tagagainstWorkspace/Rootbefore continuing. The function already carries// TODO make this faster by caching the workspace package idsat line 770.ExternalSlice::containsis an O(1) range check (id >= off && id < off+len), so the per-call cost is dominated by the outer loop: O(P) where P is the current package count.Step-by-step: why it's O(N²)
Consider a fresh resolve (no lockfile) of N npm packages:
- Package 1 is appended.
is_workspace_dependencyiterates 1 package (root only). ~1 tag compare. - Package 2 is appended. Iterates 2 packages. ~2 compares.
- …
- Package N is appended. Iterates N packages. ~N compares.
Total ≈ N(N+1)/2 tag comparisons. For the overwhelming majority of dependencies (transitive, not declared in a workspace
package.json), the loop finds no match and runs to completion — no early exit.The two pre-existing call sites of
is_workspace_dependencyin this file (lines ~2631/~2737) fire only forTag::FolderandTag::Workspacedependencies, which are rare. This PR adds the first call site that fires on every npm package append — the common case on a fresh install.Why existing code doesn't prevent it
The
||short-circuits only when the left operand istrue, butis_workspace_dependencyis on the left, so the O(N) scan runs unconditionally before the O(1) exact-pin test is even considered. And since most dependencies are transitive ranges (not workspace deps, not exact pins), neither operand is usually true and the full scan is paid every time regardless.Impact
The inner loop is a single tag-byte comparison over a contiguous struct-of-arrays slice — extremely cache-friendly and branch-predictable. Rough numbers:
- N = 3,000 packages → ~4.5M compares → single-digit ms.
- N = 10,000 packages → ~50M compares → tens of ms.
- N = 50,000 packages → ~1.25B compares → ~1–2 s.
Fresh installs are dominated by manifest fetches and tarball extraction by orders of magnitude, so at typical N this is well under 1% of wall time and produces identical output. Nothing breaks. But it is a real complexity regression on the append hot path — the exact scenario (fresh, no-lockfile install) this PR is fixing — and the O(1) alternative is right at hand.
How to fix
The append site already knows which package's manifest produced this dependency (the parent). A dependency is "declared in a local package.json" iff its parent's resolution tag is
RootorWorkspace— that's an O(1) lookup on state the caller already holds, and it's exactly whatget_workspace_pkg_if_workspace_depcomputes the hard way. Using that directly restores O(1) per append.Failing that, either implement the existing TODO (cache workspace package ids once — the set is small and fixed after the local-package walk), or at least reorder the
||soversion.is_exact()is tested first. The reorder is nearly free but only helps the minority of deps that are exact pins, since most transitive constraints are ranges. - Package 1 is appended.
…rkspace test's install count
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On the
Leaving the scan as is rather than adding a second watermark for this. |
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Actionable comments posted: 1
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Inline comments:
In `@test/cli/install/bun-install-registry.test.ts`:
- Around line 4612-4613: In both affected tests, move the
assertManifestsPopulated call before expect(exitCode).toBe(0), keeping the
exit-code assertion last as in the other registry-focused install tests.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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📒 Files selected for processing (3)
src/install/PackageManager/PackageManagerEnqueue.rssrc/install/lockfile.rstest/cli/install/bun-install-registry.test.ts
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#38770 fixes the same fresh-install case (the guard in |
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I reviewed this PR and didn't find any bugs. The earlier vacuous-assertion nit was addressed in e4d4528. Because this widens the dedupe guard in core install resolution and overlaps with #38770 (which takes a different approach to the same guard plus the update paths), a human look to pick between the two would be worthwhile.
What was reviewed:
- Rename
exact_pinned→local_pinnedis complete; no stale references remain. is_workspace_dependencyresolves viaget_workspace_pkg_if_workspace_dep(Root/Workspace tag scan) — the exemption only widens, never narrows, so no existing dedupe is blocked.- Both new tests assert exact install counts and the absence of the nested
node_modules; the root variant also verifies the second install does not rewrite the lockfile.
Extended reasoning...
Overview
Two Rust files and one test file. lockfile.rs renames the exact_pinned bitset to local_pinned and shortens the doc/guard comments; PackageManagerEnqueue.rs widens the mark condition at the append site to also include dependencies declared in a root or workspace package.json (via the existing Lockfile::is_workspace_dependency), reordering so the cheap exact-pin check runs first. bun-install-registry.test.ts gains two tests (root and workspace variants) using the existing hoist-lockfile-* fixture packages.
Security risks
None. No untrusted input parsing, no path handling, no network surface — this only changes which already-resolved package a transitive range dedupes onto.
Level of scrutiny
Medium-high. The diff is small and mechanically clean (a rename plus one added || clause), but it sits in the install resolver's dedupe decision, where a wrong exemption produces non-deterministic lockfiles across the ecosystem. The load-bearing claim is that root/workspace dependencies are enqueued from disk before any network-ordered transitive can append, so exempting them from the order-independence guard stays deterministic. That reads correct given the enqueue path structure, and the "text lockfile is hoisted" snapshot is unchanged, but it is the kind of invariant a maintainer who owns the enqueue ordering should confirm.
Other factors
- Overlapping PR #38770 covers the same
get_package_idguard plus threebun updatepaths using a different mechanism (checking what root/workspace rows currently resolve to, rather than marking at append). The author notes only one should land as-is; a human should decide which approach to take, or whether to land this and rebase #38770 to drop the overlapping hunk. is_workspace_dependencyis an O(packages) scan (with an existing TODO to cache workspace ids) now called once per appended package. The author's cost analysis in the thread is reasonable (~millisecond-scale for a 3k-package tree, dwarfed by network+extract), and the exact-pin short-circuit was moved first in e4d4528.- All prior review threads (comment-cop on comment length, my vacuous-assertion nit, coderabbit's assertion-order suggestion) are resolved; the current comments are 2–3 lines and describe an invariant, not a workaround.
- Tests follow the file's existing conventions (spawn/env/assertManifestsPopulated ordering matches ~80 sibling tests) and assert the strongest invariant — exact line arrays, hoisted version, and absence of the nested directory.
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Note for whoever picks this up: #38770 (opened after this PR) covers the same fresh-resolution case plus the
Either order works: if this lands first, #38770 drops its |
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CI status for e4d4528 (build 96961): 177 of 179 jobs passed with no test failures; the 11 annotations are all retries that passed. The two remaining jobs, both |
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New report of the same bug: #40020. A fresh install of |
1 participant
What
On a fresh resolve, a transitive wide range (
*,>=1.0.0) that satisfies an already-resolved root/workspace dependency was being refused a dedupe when the manifest's best-match was a different major, nesting a duplicate copy instead. npm and bun 1.3.x both dedupe here.Repro
Before:
3 packages installed,node_modules/hoist-lockfile-1/node_modules/hoist-lockfile-shared@2.0.2nested.After / npm:
2 packages installed, singlehoist-lockfile-shared@1.0.2.Real-world: a fresh
jest ^29.7.0+ts-jest ^29.1.5+@types/node ^20.14.0install went from 1 copy of@types/nodeto 17 (node_modules 63M -> 107M), and the duplication is written intobun.lock.Cause
try_satisfies_dedupeinLockfile::get_package_idhas an order-independence guard that refuses a cross-major satisfies-dedupe onto any session-appended entry that was not appended for an exact=X.Y.Zdependency. The guard exists to keep the "text lockfile is hoisted" snapshot deterministic when every constraint on a package is transitive (network-ordered manifest arrival).It over-fires: a package appended for a root/workspace range dependency is also "session-appended, not exact", so the guard blocks deduping onto it even though root/workspace dependencies are read from disk and enqueued onto the manifest task queue before any network-ordered transitive can be, making the dedupe deterministic.
Fix
Broaden the guard's exemption bitset (renamed
exact_pinned->local_pinned) to also include packages appended for a dependency declared in any localpackage.json(root or workspace), viaLockfile::is_workspace_dependencyat the append site inget_or_put_resolved_package_with_find_result. The guard now fires only when the existing entry was appended for a transitive range in this session, which is the actual flake condition. Thetext lockfile is hoistedsnapshot is unchanged.Verification
Two new tests (root-declared and workspace-declared variants) fail on
mainwith "3 packages installed" / nestednode_modules/hoist-lockfile-1/node_modules, and pass with this change.Rebased onto main after #38333 landed (the
exact_pinnedguard it scopes is unchanged there). Re-verified on that base: the two tests still fail with main'ssrc/installand pass with this diff;bun-install-registry.test.ts,bun-dedupe.test.ts,hoist.test.ts,bun-lock.test.ts,nested-overrides.test.ts,overrides.test.tsandbun-update-lockfile-sync.test.tspass (579 tests). The earlier verdaccio bind change totest/harness.tswas dropped from this PR since main fixed it separately.Real-world instance of this on current main: the
@types/node"*"cross-major nesting seen in the 1.4 release-readiness install corpus.no test proof · iteration 2 · 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