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Warn on every install, not only bun update, when a patchedDependencies key in package.json matches no installed version of the package. Fail bun install --frozen-lockfile in that case, since the declared patch is silently dropped otherwise. Fixes #40106
WalkthroughThe change detects orphaned ChangesOrphaned patch validation
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Updated 9:13 AM PT - Aug 22nd, 2026
❌ @robobun, your commit 34dba25 has 1 failures in 🧪 To try this PR locally: bunx bun-pr 40110That installs a local version of the PR into your bun-40110 --bun |
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In `@src/install/PackageManager/install_with_manager.rs`:
- Around line 691-696: Update the has_orphaned_patches flow around
warn_orphaned_patches so frozen-lockfile dry runs still detect orphaned
patchedDependencies entries instead of unconditionally returning false; suppress
only the dry-run warning output as needed, and add a regression case covering
bun install --frozen-lockfile --dry-run with a stale patch.
In `@src/install/update_transitive.rs`:
- Around line 784-787: Update the orphaned-patch handling around any_orphaned so
the stale-patch bun_core::warn! is emitted even when silent is true; remove or
bypass the silent-based continue while preserving orphan tracking and subsequent
control flow, and add a --silent regression test verifying the warning appears.
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docs/pm/cli/install.mdxdocs/pm/cli/patch.mdxsrc/install/PackageManager/install_with_manager.rssrc/install/update_transitive.rstest/cli/install/bun-update-transitive.test.ts
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…validation A dry run suppresses the warning but still detects the orphaned key, so bun install --frozen-lockfile --dry-run fails on a stale patchedDependencies entry.
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Additional findings (outside current diff — PR may have been updated during review):
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src/install/PackageManager/install_with_manager.rs:829-835— The unconditionalnote: try re-running without --frozen-lockfile and commit the updated lockfileis wrong advice for the new orphaned-patch failure mode: the stale key lives only inpackage.json, so a plainbun installchanges nothing and the next frozen install fails identically (this PR's own second test proves it —await install(dir)already ran before the frozen failure). Whenhas_orphaned_patches && changed_section.is_none(), suppress the generic re-run note and emit the patch-specific remedy from this PR's docs instead: "re-create the patch for the new version, or remove the stale entry from package.json".Extended reasoning...
What the bug is
This PR adds a new way for
--frozen-lockfileto fail:has_orphaned_patches. When it fires, the error output atsrc/install/PackageManager/install_with_manager.rs:820-836is:error: lockfile had changes, but lockfile is frozen note: a patchedDependencies entry in package.json no longer applies to any installed package version note: try re-running without --frozen-lockfile and commit the updated lockfileThe final
note:at line 834-836 is emitted unconditionally for every frozen-lockfile failure. For the pre-existing failure modes (changed_section/ lockfile drift), it is correct: runningbun installregeneratesbun.lockand committing it makes the next frozen install pass. But for the orphaned-patch case this PR introduces, following that advice does not converge.The specific code path that triggers it
At line 797,
changed_section.is_none() && !has_orphaned_patchesgates the "break out, everything is fine" path. When onlyhas_orphaned_patchesis true, execution falls through to the error block. Line 829-832 correctly prints the new patch-specific cause note. Then line 834-836 unconditionally appends the generic re-run hint.Why the existing note doesn't help here
Per the PR description: "
bun.lockrecords only the patches that applied… A stale key therefore lives inpackage.jsonand nowhere else." Re-runningbun installwithout--frozen-lockfile:- prints the
warn:line, - leaves
bun.lockbyte-identical (nothing to update — dependencies already match), - does not touch
package.json'spatchedDependencies.
Committing an unchanged lockfile does nothing. The next
bun install --frozen-lockfilefails again with the same message. The user is sent on a loop.Step-by-step proof from this PR's own test
The second new test in
test/cli/install/bun-update-transitive.test.tsdemonstrates exactly this:await install(dir)onno-deps@1.0.0+ patch → lockfile written, patch applies.package.jsonbumped tono-deps@1.1.0(patch key staysno-deps@1.0.0).await install(dir)— the very command the note recommends — runs and saves the lockfile.bun install --frozen-lockfile→ still fails with "lockfile had changes, but lockfile is frozen" + the orphaned-patch note.
Step 3 is literally "re-running without --frozen-lockfile", and step 4 shows it did not fix the failure. The note's remedy is provably ineffective for this branch.
Impact
Message-quality only. The user already sees:
warn: patches/no-deps@1.0.0.patch no longer applies (no-deps is now 1.1.0)— names the exact stale entry.note: a patchedDependencies entry in package.json no longer applies…— names the cause.
So they can figure it out despite the misleading trailing hint. Nothing breaks functionally; following the bad advice causes no harm, it just doesn't fix anything. But REVIEW.md: "Error messages are reviewed word-for-word as code… a concrete remedy… recovery hints on a
note:line." This PR introduces a failure mode where the pre-existing generic remedy note does not apply, and the PR author already wrote the correct remedy in bothdocs/pm/cli/install.mdxanddocs/pm/cli/patch.mdx: "Re-create the patch for the new version, or remove the stale entry."How to fix
Replace the unconditional trailing note with a branch:
} else if has_orphaned_patches { bun_core::note!( "a patchedDependencies entry in package.json no longer applies to any installed package version" ); bun_core::note!( "re-create the patch for the new version, or remove the stale entry from package.json" ); } if changed_section.is_some() || !has_orphaned_patches { bun_core::note!( "try re-running without <d>--frozen-lockfile<r> and commit the updated lockfile" ); }
(or equivalently: emit the generic re-run note only when
!(has_orphaned_patches && changed_section.is_none()), and emit the patch-specific remedy in its place otherwise). The "lockfile had changes" headline is also slightly off for this case (nothing inbun.lockchanged), but that's the pre-existing generic frame and lower priority. - prints the
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src/install/PackageManager/install_with_manager.rs:691-696— The orphaned-patch check is gated on!manager.options.dry_run, sobun install --frozen-lockfile --dry-runexits 0 on an orphaned patch whilebun install --frozen-lockfilefails on the same tree — contradicting the docs one paragraph below this PR's own addition ("To validate the lockfile without installing, usebun install --frozen-lockfile --dry-run").warn_orphaned_patcheshas no dry-run-unsafe side effects (it only reads the cached package.json and the cleaned in-memory lockfile, then prints), so drop the!dry_rungate on the detection — it was carried over from the oldbun update-only call site where it was a display concern, but now the return value feeds a failure predicate.Extended reasoning...
What the bug is
At
install_with_manager.rs:691-696,has_orphaned_patchesis hard-coded tofalsewhenmanager.options.dry_runis set:let has_orphaned_patches = if !manager.options.dry_run { Output::flush(); crate::update_transitive::warn_orphaned_patches(manager) } else { false };
This value then feeds the frozen-lockfile failure predicate at line ~797:
if changed_section.is_none() && !has_orphaned_patches { // ... Lockfile::eql check, break 'frozen_lockfile on match }
The frozen-lockfile block itself is gated only on
options.enable.frozen_lockfile() && !matches!(load_result, LoadResult::NotFound)— it runs under--dry-run. So under--frozen-lockfile --dry-run, the orphaned-patch predicate can never fire.Step-by-step proof
Take the exact scenario from this PR's second new test, after the
await install(dir)step:bun.lockis in sync withpackage.jsonatno-deps@1.1.0;patchedDependenciesstill has the keyno-deps@1.0.0.- Run
bun install --frozen-lockfile --dry-run. - The differ finds no diffs (
changed_sectionisNone; overrides/catalogs unchanged). has_orphaned_patchesis forced tofalsebecausedry_runis set.Lockfile::eqlcompares the cleaned lockfile against the loaded one. Per this PR's own description andfrozen-lockfile-pruned.test.ts, the frozeneqlintentionally excludes the patched map — a patched-map edit alone passes. Since nothing else changed,eqlreturns true.break 'frozen_lockfile— exit 0, no warning printed.
Now run the same command without
--dry-run:warn_orphaned_patchesruns, findsno-deps@1.0.0matches no installed version (only1.1.0is installed), prints the warning, and returnstrue.changed_section.is_none() && !has_orphaned_patchesisfalse, so the fast-path break is skipped.- The error branch prints
error: lockfile had changes, but lockfile is frozenplus the newnote: a patchedDependencies entry in package.json no longer applies…, thenGlobal::crash()— exit nonzero.
Same tree, different exit code depending on
--dry-run. This is exactly what the PR's second test asserts for the non-dry-run case; the dry-run variant is not covered.Why existing code doesn't prevent it
Nothing before line 691 branches on
dry_runin a way that changes the lockfile statewarn_orphaned_patchesreads: the lockfile loads, the differ runs, andclean_with_loggerruns identically. So the function would return the same boolean under--dry-runas without it — the only thing suppressing it is the explicitelse { false }.Why the gate exists (and why it no longer applies)
Before this PR the call site was
if manager.subcommand == Subcommand::Update && !manager.options.dry_run { … warn_orphaned_patches(manager); }. The!dry_rungate was a display-ordering concern: underbun update --dry-run,transitive.print_plan(which runs immediately before) owns the output and the install summary is skipped, so an interleaved warning was unwanted. It never gated a validation result. This PR repurposed the return value to feed--frozen-lockfile's failure predicate but kept the gate, creating a variant-matrix gap (REVIEW.md: "Cover the variant matrix, not just the repro… both states of every flag").Impact
docs/pm/cli/install.mdxstates, one paragraph below this PR's own addition: "To validate the lockfile without installing, usebun install --frozen-lockfile --dry-run." Combined with the newly-added "--frozen-lockfilealso fails when apatchedDependenciesentry in package.json no longer applies", the docs promise behavior the code doesn't deliver. Someone dry-run-validating locally (or in a validation CI job) gets exit 0, then the actualbun cifails — the exact silent-drift #40106 is about.Fix
warn_orphaned_patchesperforms no filesystem writes: it reads the (already-cached) rootpackage.jsonviaworkspace_package_json_cache.get_with_pathwithinit_reset_store: false, iterates the in-memory cleaned lockfile, prints warnings, and flushes. Nothing about it is unsafe under--dry-run. Drop the!dry_rungate:Output::flush(); let has_orphaned_patches = crate::update_transitive::warn_orphaned_patches(manager);
(If suppressing the warning line specifically for
bun update --dry-run'sprint_planoutput is still wanted, gate only the printing insidewarn_orphaned_patches— the detection and return value must run regardless.) Add a--dry-runvariant of the second new test to lock this in.Addressing the refutation
The one refutation flags bug_002 as a duplicate of bug_001; both describe the same code location and issue and have already been merged into this single finding. There is no substantive objection to the bug itself — six independent verifiers confirmed it.
… a stale patch A plain re-run does not fix a stale patchedDependencies key, so the generic re-run note is replaced with the bun patch remedy in that case.
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Both findings are addressed:
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My earlier note about the misleading try re-running without --frozen-lockfile remedy is addressed in 34dba25 — the orphaned-patch arm now prints the correct bun patch / remove-the-entry advice, and the test asserts both its presence and the absence of the generic hint. I didn't find any remaining issues.
What was reviewed
warn_orphaned_patchesreturn-value plumbing and thequietgate: silent/dry-run detect without printing, non-quiet still flushes; earlyreturn falsepaths preserved.- Frozen-lockfile control flow:
changed_sectionstill takes precedence, theelsearm keeps the generic note forLockfile::eql/ meta-hash drift, and the dry-run form now fails (covered by the new test). - Confirmed the unconditional
Output::flush()before the call is harmless, and CodeRabbit's--silentfinding contradicts the stated design.
Deferring to a maintainer only because this makes --frozen-lockfile stricter (previously-passing CI with a stale patch entry will now fail, with no opt-out) — that product decision is worth a human sign-off.
Extended reasoning...
Overview
The PR extends warn_orphaned_patches (already used by bun update) to run on every install and to return whether any patchedDependencies key in package.json no longer matches an installed version. Under --frozen-lockfile (including the documented --dry-run validation form), an orphaned key now fails the install with a specific note naming the cause and the correct remedy (bun patch or remove the entry). Two new tests, plus doc updates in install.mdx and patch.mdx. ~30 lines of Rust across two files.
Prior review
I left one inline finding on the previous revision: the new has_orphaned_patches arm fell through to the generic try re-running without --frozen-lockfile note, which cannot converge for a stale patch key. Commit 34dba25 fixes this by giving that arm its own remedy note and moving the generic note into the other two arms; the new test asserts the specific note is present and the generic one is absent. The dry-run gap CodeRabbit raised was fixed in 8492e62 (also covered by the test). CodeRabbit's second finding (emit the warning under --silent) contradicts the PR's stated design and was correctly not acted on.
Security risks
None. No untrusted input parsing, no auth/crypto/permissions. The change reads package.json keys already parsed by the existing cache and compares them against lockfile resolutions.
Level of scrutiny
Moderate. The Rust change is small and follows existing patterns (bun_core::note!, bun_core::warn!, same error-path structure as the sibling changed_section arm). Tests are hermetic (Verdaccio registry via setup()), assert exact warning/note text, cover both the warning path and the frozen failure (plus dry-run), and were verified to fail on main. The one CI failure (heapStats-mimalloc.test.ts on macOS aarch64) is unrelated.
Other factors / why defer
This is a user-facing behavior change: bun install --frozen-lockfile will now fail where it previously exited 0 for projects carrying a stale patchedDependencies entry. The PR description explicitly chooses not to add an escape hatch (pnpm has allowNonAppliedPatches). I think that's the right call — silently dropping a patch is a correctness bug — but tightening --frozen-lockfile is a product decision a maintainer should confirm rather than an automated approval.
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Problem
patchedDependencieskey inpackage.jsonis matched by the exactname@version. When the package moves to a new version, the key matches nothing, and the patch is silently not applied. There is no warning, andbun install --frozen-lockfileexits 0 (patchedDependencies: a stale version key silently drops the patch, and --frozen-lockfile does not catch it #40106).bun updatecallswarn_orphaned_patches(src/install/PackageManager/install_with_manager.rs:691). Plain installs skip the check.Fix
warn_orphaned_patcheson every install. Each stale key printswarn: <patch> no longer applies (<name> is now <version>).--frozen-lockfile, an orphaned key fails the install witherror: lockfile had changes, but lockfile is frozenand a note that names the cause. This includes the documented--frozen-lockfile --dry-runvalidation form. A patched map edit alone still passes, as the existing tests infrozen-lockfile-pruned.test.tsrequire: a patch added afterbun.lockwas written still applies and passes.test/cli/install/bun-update-transitive.test.ts(both fail on stock bun). Also ran the patch, lockfile, frozen, isolated, workspaces, dedupe, and migration install suites.Background
bun.lockrecords only the patches that applied: the writer matches each package against the patched map by thename@versionhash and emits the hits. A stale key therefore lives inpackage.jsonand nowhere else.warn_orphaned_patches(src/install/update_transitive.rs) reads the rootpackage.jsonkeys, and compares eachname@versionagainst the lockfile's installed versions of that name. Non-npm resolutions and version-less keys are skipped.Notes
bun install --frozen-lockfileexits 0 and the patched behavior is gone. Confirmed on 1.4.0.summary.patched_dependencies_changed. That breaks the documented workflows covered byfrozen-lockfile-pruned.test.ts("patchedDependencies added/removed after bun.lock was written still passes --frozen-lockfile"), so the narrower predicate is used instead.bun updatecan hold resolutions it will not commit. Detection still runs, so the frozen check sees the orphan.allowNonAppliedPatchesas the opt-out. This PR does not add an escape hatch: removing the stale key frompackage.jsonis the fix, and the warning path stays non-fatal outside--frozen-lockfile.docs/pm/cli/install.mdxanddocs/pm/cli/patch.mdx.[review] gate passed · iteration 0 · 5 files touched
fails on main (without fix)
passes on PR (with fix)
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gate history · 1 passed · 0 rejected · iteration 0
evidence per changed file
root cause · written by the author bot
Patches in patchedDependencies are keyed by exact version, so when a dependency update moved a patched package to a new version the stale key no longer matched anything installed and Bun silently skipped the patch, with install and even --frozen-lockfile exiting zero. The fix detects these orphaned entries during install by comparing the patchedDependencies keys in package.json against the patches actually applied, emits a warning naming the stale entry, and treats the mismatch as a lockfile divergence under --frozen-lockfile so the install fails. The frozen-lockfile error also prints a pat…