bun pm migrate fails on pnpm lockfile v9 (InvalidPnpmLockfile)

[schickling]

What happens?

Running bun pm migrate in a repo with a pnpm v9 lockfile fails immediately with InvalidPnpmLockfile. bun install --lockfile-only also reports the same error and then ignores the lockfile.

Steps to reproduce

1. Create or open a repo with a pnpm lockfile v9 (e.g. lockfileVersion: '9.0').
2. Run: bun pm migrate

Actual output

error: Error loading lockfile: InvalidPnpmLockfile

Expected

bun pm migrate should migrate a pnpm v9 lockfile, or at least provide a more specific error with a way to bypass/force/skip.

Environment

• Bun: 1.3.5 (1e86ceb)
• pnpm lockfileVersion: 9.0 (pnpm 10.17.1)
• OS: macOS

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Filed on behalf of @schickling.