build: Update swc_core to v55.0.2

[kdy1]

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[claude]

Pull Request Review

Summary

This PR updates swc_core from v53.0.0 to v55.0.2, a minor version bump that includes several upstream dependency updates. This affects all 18 plugins in the monorepo.

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✅ Code Quality & Best Practices

Positive Aspects:

• Consistent versioning: All plugins bump their minor versions appropriately, following semantic versioning
• Comprehensive changeset: The changeset was properly consumed and CHANGELOGs were updated for all affected packages
• Lock file updated: Cargo.lock correctly reflects all transitive dependency updates
• Workspace-level management: Using workspace dependencies in root Cargo.toml ensures consistency across all packages

Observations:

• All 69 changed files are metadata updates (Cargo.toml, package.json, CHANGELOG.md, README.md) - no actual code changes
• The PR includes properly formatted commit messages and changelog entries
• README template merges were completed (README.tmpl.md → README.md)

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📦 Dependency Updates

Major upstream changes in swc_core 55.x:

1. New dependencies added:

   • dragonbox_ecma@0.1.0 - Added to swc_ecma_codegen (likely for improved number-to-string conversion)
   • swc_ecma_hooks@0.4.0 - New hooks system for ECMAScript transformations

2. Breaking changes in transitive dependencies:

   • swc_ecma_ast: 19.0.0 → 20.0.0 (major)
   • swc_ecma_codegen: 21.0.0 → 22.0.0 (major)
   • swc_ecma_parser: 31.0.0 → 33.0.0 (major, skipped v32)
   • swc_ecma_transforms: 43.0.0 → 45.0.0 (major, skipped v44)
   • swc_ecma_minifier: 41.0.0 → 43.0.2 (major)

3. Notable change in swc_ecma_codegen:

   • Removed: ryu-js dependency
   • Removed: swc_sourcemap dependency
   • Added: dragonbox_ecma (replacement for number formatting)

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🔍 Potential Issues

⚠️ Medium Priority:

1. No code compatibility verification visible

   • Since swc_ecma_ast, swc_ecma_codegen, and swc_ecma_parser all had major version bumps, there may be breaking API changes
   • The fact that no Rust source files changed suggests the plugins' code is still compatible, but this should be verified through successful CI runs

2. Multiple major version skips

   • swc_ecma_parser jumped from v31 → v33 (skipped v32)
   • swc_ecma_transforms jumped from v43 → v45 (skipped v44)
   • This is unusual but may be intentional for alignment

ℹ️ Low Priority:

3. Formatjs additional change
   • The formatjs package includes an additional change: fix(formatjs): Variable evaluate concatenation (from changeset cuddly-points-cover.md)
   • This suggests a bug fix was included alongside the version bump
   • Worth verifying this fix is properly tested

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🔒 Security Concerns

No security issues identified:

• All updates are from the trusted swc-project ecosystem
• Dependency updates come from official crates.io registry
• No new external dependencies with unknown provenance
• The new dragonbox_ecma crate is a well-known algorithm implementation for number-to-string conversion

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🧪 Test Coverage

Current status:

• ✅ CI checks are running (Integration Tests, Cargo Tests, Check)
• ✅ CLA is signed
• ✅ Socket Security checks passed
• ⏳ Multiple test jobs are still pending

Recommendations:

1. Wait for CI to complete - Ensure all tests pass, especially:

   • Integration tests on Ubuntu and macOS
   • Cargo tests on Ubuntu and Windows
   • The swc_ast_unknown check

2. Manual verification suggested (if not covered by existing tests):

   • Test at least one plugin transformation to ensure runtime compatibility
   • Verify WASM plugin system still works correctly
   • Check that number formatting in code generation behaves identically

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⚡ Performance Considerations

Potential improvements:

• The dragonbox_ecma algorithm is generally faster than ryu-js for ECMAScript number formatting
• Removal of swc_sourcemap from swc_ecma_codegen may reduce compilation overhead
• The new swc_ecma_hooks system might provide better extension points

No performance regressions expected, but worth monitoring:

• Build times (both Rust and final WASM)
• Plugin transformation throughput
• Memory usage during transformations

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📋 Recommendations

Before merging:

1. ✅ Wait for all CI checks to pass - This is critical given the major version bumps in core dependencies
2. 🔍 Review the formatjs bug fix - Ensure the concatenation fix is working as expected
3. 📝 Document migration notes - If there are any behavioral changes in number formatting or codegen, document them

Optional but recommended:

4. 🧪 Smoke test a few plugins - Quick manual verification won't hurt
5. 📊 Monitor post-release - Watch for any user-reported issues with v55.x

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🎯 Conclusion

This is a well-structured dependency update PR that follows the repository's conventions. The mechanical changes look correct, and the versioning strategy is appropriate.

Approval recommendation: ✅ Approve after CI passes

The only blocking concern is ensuring CI tests validate compatibility with the major version bumps in upstream SWC dependencies. Once those pass, this should be safe to merge.

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Great work on maintaining consistency across all 18 packages! 🚀