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### What does this PR do? fixes #6409 This PR implements `bun install` automatic migration from yarn.lock files to bun.lock, preserving versions exactly. The migration happens automatically when: 1. A project has a `yarn.lock` file 2. No `bun.lock` or `bun.lockb` file exists 3. User runs `bun install` ### Current Status: ✅ Complete and Working The yarn.lock migration feature is **fully functional and comprehensively tested**. All dependency types are supported: - ✅ Regular npm dependencies (`package@^1.0.0`) - ✅ Git dependencies (`git+https://github.com/user/repo.git`, `github:user/repo`) - ✅ NPM alias dependencies (`alias@npm:package@version`) - ✅ File dependencies (`file:./path`) - ✅ Remote tarball URLs (`https://registry.npmjs.org/package.tgz`) - ✅ Local tarball files (`file:package.tgz`) ### Test Results ```bash $ bun bd test test/cli/install/migration/yarn-lock-migration.test.ts ✅ 4 pass, 0 fail - yarn-lock-mkdirp (basic npm dependency) - yarn-lock-mkdirp-no-resolved (npm dependency without resolved field) - yarn-lock-mkdirp-file-dep (file dependency) - yarn-stuff (all complex dependency types: git, npm aliases, file, remote tarballs) ``` ### How did you verify your code works? 1. **Comprehensive test suite**: Added 4 test cases covering all dependency types 2. **Version preservation**: Verified that package versions are preserved exactly during migration 3. **Real-world scenarios**: Tested with complex yarn.lock files containing git deps, npm aliases, file deps, and remote tarballs 4. **Migration logging**: Confirms migration with log message `[X.XXms] migrated lockfile from yarn.lock` ### Key Implementation Details - **Core parser**: `src/install/yarn.zig` handles all yarn.lock parsing and dependency type resolution - **Integration**: Migration is built into existing lockfile loading infrastructure - **Performance**: Migration typically completes in ~1ms for most projects - **Compatibility**: Preserves exact dependency versions and resolution behavior The implementation correctly handles edge cases like npm aliases, git dependencies with commits, file dependencies with transitive deps, and remote tarballs. --------- Co-authored-by: Jarred-Sumner <709451+Jarred-Sumner@users.noreply.github.com> Co-authored-by: Claude Bot <claude-bot@bun.sh> Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com> Co-authored-by: RiskyMH <git@riskymh.dev> Co-authored-by: RiskyMH <56214343+RiskyMH@users.noreply.github.com>