Cause (Documented platform behavior): Migrator supports only newer lockfile formats.
Fix status: documented_behavior
Misleading approaches:
- Assuming the migrated bun.lock reproduces the old lock when the warning path resolved from package.json.
Limitations:
- Derived from source at the cited commit; not reproduced.
- Rendered text includes the file name and version.
Other error fragments:
- resolving from package.json instead
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/oven-sh/bun/a4f1429148114ddc3bccc13764781be27a7a9523/src/install/migration.rs (official_docs, unknown, documented_behavior): report_unsupported_lockfile_version warns '... which bun cannot migrate; resolving from package.json instead' for install/add/update/remove/link (non fail-early) or errors otherwise, with note 'npm install --package-lock-only --lockfile-version=3' (package-lock versions 2–4 accepted) or 'pnpm install --lockfile-only'.
Search phrasings: bun cannot migrate lockfileVersion 1; bun install package-lock.json migration old; bun pnpm-lock too old migrate
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Either an error (fail-early/frozen contexts) or a warning, after which Bun resolves fresh versions from package.json — versions differ from what npm/pnpm had locked.
- Context
- Product: Bun Component: lockfile migration Operation: First bun install in a repo that only has an old package-lock.json (lockfileVersion 1) or old pnpm-lock.yaml Affected versions: unknown Environment: unknown Packages: bun current at cited commit Trigger: package-lock.json lockfileVersion outside 2–4, or pnpm lockfile too old.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- which bun cannot migrate
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [bun install migrating npm/pnpm lockfiles] 'package-lock.json is lockfileVersion 1, which bun cannot migrate' (only v2–v3/4 supported; old pnpm-lock too) — frozen/CI installs fail, other
Recommended action: Upgrade the source lockfile first: `npm install --package-lock-only --lockfile-version=3` or `pnpm install --lockfile-only`, then run bun install and review bun.lock.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- ae4ae6ba-08da-45b3-8aa4-77fc556fd4ce
- Proposed action
- Recommended action: Upgrade the source lockfile first: `npm install --package-lock-only --lockfile-version=3` or `pnpm install --lockfile-only`, then run bun install and review bun.lock.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.