install: stamp lockfileVersion 1 on new bun.lock files - #38741
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Status: ready for review (head 1157016, rebased onto main). Reproduced on current main: Review feedback: docs wording tightened, selection comments shortened; all threads resolved. The stale CI (build 97233): 178 of 180 jobs finished, none failed; the remaining annotations all passed on retry or alone. The two Whether 1.4 should keep writing v2 by default is a release decision; this PR is the option that keeps new lockfiles readable by 1.3. Closing it means #28792 / #36463 stand as written. |
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WalkthroughFresh lockfiles now use version 1. Existing version 1 and version 2 lockfiles preserve their versions. Scoped overrides and compatible clean lockfiles use version 3. Documentation and install tests reflect these rules. ChangesLockfile versioning
Possibly related issues
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Inline comments:
In `@docs/pm/lockfile.mdx`:
- Around line 57-60: Update the lockfileVersion documentation around
Stringifier::version_to_write to state that re-saving generally preserves the
existing version, except that v0 and v3 lockfiles without scoped overrides are
converted to v1, and scoped-override lockfiles whose content fails the v2
compatibility walk are also written as v1.
In `@test/cli/install/lockfile-version-2.test.ts`:
- Around line 71-74: In the installation test, assert the subprocess exitCode
before reading bun.lock, including stdout in the assertion diagnostics. Place
this guard immediately after the install command and before the file(...) read,
while preserving the existing lockfile-content assertions for successful
installations.
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⛔ Files ignored due to path filters (10)
test/cli/install/__snapshots__/bun-install-registry.test.ts.snapis excluded by!**/*.snaptest/cli/install/__snapshots__/bun-lock.test.ts.snapis excluded by!**/*.snaptest/cli/install/__snapshots__/catalogs.test.ts.snapis excluded by!**/*.snaptest/cli/install/migration/__snapshots__/migrate.test.ts.snapis excluded by!**/*.snaptest/cli/install/migration/__snapshots__/pnpm-comprehensive.test.ts.snapis excluded by!**/*.snaptest/cli/install/migration/__snapshots__/pnpm-lock-migration.test.ts.snapis excluded by!**/*.snaptest/cli/install/migration/__snapshots__/pnpm-lock-v9.test.ts.snapis excluded by!**/*.snaptest/cli/install/migration/__snapshots__/pnpm-migration-complete.test.ts.snapis excluded by!**/*.snaptest/cli/install/migration/__snapshots__/pnpm-migration.test.ts.snapis excluded by!**/*.snaptest/cli/install/migration/__snapshots__/yarn-lock-migration.test.ts.snapis excluded by!**/*.snap
📒 Files selected for processing (8)
docs/pm/catalogs.mdxdocs/pm/lockfile.mdxsrc/install/lockfile/bun.lock.rstest/cli/install/bun-install.test.tstest/cli/install/bun-workspaces.test.tstest/cli/install/config-version.test.tstest/cli/install/lockfile-version-2.test.tstest/cli/install/nested-overrides.test.ts
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Updated 11:05 PM PT - Aug 14th, 2026
❌ @robobun, your commit 1157016 has some failures in 🧪 To try this PR locally: bunx bun-pr 38741That installs a local version of the PR into your bun-38741 --bun |
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I reviewed this PR and didn't find any bugs. The version_to_write refactor is correct (exhaustive match, v1/v2 preserved, v0 and fresh/v3 → v1, walk only runs for scoped overrides), and the test/snapshot/docs updates are consistent. That said, this changes the default lockfileVersion stamped on every new bun.lock and — per the description — decides whether #28792, #36463, and #36464 stand as written; that release-policy call warrants a human sign-off.
What was reviewed:
version_to_writecontrol flow: all fourVersionarms covered; the walk still gates v3 on config-independent rows and falls back to v1.- Confirmed a loaded v2 is still preserved (new test) and a v3 lockfile that loses its scoped rules now drops to v1 rather than v2 (nested-overrides test updated to match).
- Snapshot flips are all freshly-written
bun.lockfiles (each has the trailingconfigVersionline); no npmpackage-lock.jsonfixtures touched.
Extended reasoning...
Overview
The PR changes one function, Stringifier::version_to_write in src/install/lockfile/bun.lock.rs, so that a freshly created bun.lock (or one loaded as v0/v3 without scoped overrides) is stamped lockfileVersion: 1 instead of 2. Loaded v1/v2 lockfiles keep their version; scoped overrides still stamp v3 after the same package walk, falling back to v1 if any serialized row would fail a reader's v2 check. The remaining ~90 hunks are snapshot flips (2→1), test-assertion updates, one new preserve-v2 test, and two docs paragraphs. The parser is untouched.
Security risks
None. This only affects which integer is written into the lockfileVersion field. The v2 parse-time checks (off-registry integrity, unsafe git .bun-tag) remain gated on the reader's view of the digit in the file, and existing v2/v3 lockfiles keep those checks; the PR description correctly notes that a tampered lockfile can already bypass them by writing 1, so no enforcement is lost.
Level of scrutiny
Medium-high. The code change is small and mechanically sound — the match is exhaustive over V0..V3, and the walk logic is preserved verbatim for the v3 path. But the decision it encodes is a cross-version compatibility policy for the package manager's lockfile format. The PR author (robobun) explicitly says "Whether 1.4 should keep writing v2 by default is a release decision," and landing it means dropping the lockfileVersion: 2 entries in the changelog PR (#28792), the upgrade guide (#36463), and closing the bunfig-cap PR (#36464). That's a maintainer call.
Other factors
- All CodeRabbit and comment-cop threads are resolved; the docs wording was tightened and the long comments shortened in follow-up commits.
- The one CI failure so far (
test/js/node/test/parallel/test-http-chunk-problem.js) is an HTTP test with no plausible link to lockfile serialization. - Test coverage is solid: fail-before/pass-after on the fresh-v1 test, plus a new v2-preserve test and updated nested-overrides assertions covering the v3→v1 drop.
- One minor behavior change worth a maintainer's eye: a v3 lockfile whose scoped overrides are removed now drops to v1 (previously v2). The PR calls this out and updates the test that pins it.
A bun.lock written from scratch (fresh install, bun init, or a migration from another lockfile format) was stamped lockfileVersion 2. v2 has the same content as v1 and only enables two parse-time checks, but Bun releases that predate it refuse the file with "Unknown lockfile version", so the first install on a newer Bun broke --frozen-lockfile for everyone still on an older one. New lockfiles are now written as v1. A lockfile loaded as v1 or v2 keeps its version, v0 is still floored to v1, and scoped overrides still stamp v3 (a v3 lockfile whose scoped rules were removed drops back to v1 instead of v2). The v2 parse checks are unchanged for lockfiles that carry the version.
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Problem
bun.lockthat current main writes from scratch (bun installwith no lockfile,bun init -y, firstbun add,rm bun.lock && bun install, package-lock/yarn/pnpm migration,bun.lockbconversion) is stamped"lockfileVersion": 2.bun install --frozen-lockfile/bun cion an older Bun exits 1 (error: Unknown lockfile version,UnknownLockfileVersion: failed to parse lockfile: 'bun.lock'), and a plainbun installprintswarn: Ignoring lockfile, re-resolves frompackage.jsonand rewrites the file as v1, dropping the pins. One teammate creating a lockfile on 1.4 breaks every CI image and Docker base still on 1.3.bun.lock.rs, theat_least(Version::V2)checks: off-registry npm tarball without integrity, unsafe git.bun-tag), and since they are keyed on the digit in the file, a tampered lockfile bypasses them by saying1. Stamping 2 on new files costs the compatibility without buying enforcement.Stringifier::version_to_writeinsrc/install/lockfile/bun.lock.rswalked a fresh lockfile (no prior version) down to v2 when it passed the v2 checks. Introduced by install: bump default lockfileVersion to 2, gate stricter parse checks behind it #31539; not in any 1.3 release. Every release since 1.2.0 has otherwise written lockfiles the previous release could read; existing v1 files are already preserved on re-save (install: don't bump an existing bun.lock to lockfileVersion 2 on re-save #31602), so this only affects newly created lockfiles.Fix
version_to_writestamps v1 on a lockfile that has no prior version. A lockfile loaded as v1 or v2 keeps its version (no upgrade, no downgrade); v0 is still floored to v1; scoped overrides still stamp v3 after the same package walk as before, and a v3 lockfile whose scoped rules were removed now drops to v1 instead of v2.docs/pm/overrides.mdxalready documents it.test/cli/install/lockfile-version-2.test.ts: "a freshly written text lockfile is stamped version 1" fails on a build without this change (writes 2) and passes with it; added "re-saving a v2 lockfile keeps it at version 2" to pin the preserve behavior. 13 pass.nested-overrides.test.ts,bun-lock.test.ts,catalogs.test.ts,bun-workspaces.test.ts,config-version.test.ts,migration/*.test.ts: snapshots of freshly written lockfiles flipped from 2 to 1 (every flipped line is followed byconfigVersion, i.e. a writtenbun.lock; npmpackage-lock.jsonfixtures with their ownlockfileVersion: 2are untouched). All pass with the debug build.bun-install.test.tsandbun-install-registry.test.ts: the tests owning the flipped snapshots (-t) pass with the debug build.docs/pm/lockfile.mdxgets a shortlockfileVersionsection (new files are v1, existing versions are kept, scoped overrides need v3 / Bun 1.4); thecatalogs.mdxexample goes back to1.lockfileVersion: 2entries in List of breaking changes for 1.4 #28792 and the upgrade guide in docs: add Bun 1.3 to 1.4 upgrade guide #36463 can be dropped, and install: add [install.lockfile] lockfileVersion to cap bun.lock lockfileVersion #36464 (bunfig cap) becomes unnecessary for the 1.3 case.Background
bun.lockstarts with"lockfileVersion": N. The parser maps N toVersion(bun.lock.rs) and rejects anything it does not know, so the digit is a hard compatibility gate for older readers; the content of v0 differs (workspace entries carried a trailing object), while v1, v2 and v3 share the same content.Version::CURRENT(3) is the newest version this build can read. A freshly created in-memory lockfile hastext_lockfile_version == CURRENTbecause nothing was loaded, which is why the "no prior version" case and the "loaded v3" case share an arm inversion_to_write.version_to_writeexists because the v2+ integrity check is evaluated against the reader's registry configuration: a row that some reader could reject is held at v1 so the file loads the same everywhere. With this change the walk only runs when a v3 stamp is being considered.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.test.ts