swc-project/swc - CodSpeed

swc

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feat(swc_ecma_transformer): Add common utilities infrastructure Implements common utilities and helper infrastructure needed by all transformers, following the design from oxc_transformer but adapted for SWC's AST and patterns. ## Changes ### New Files **src/common/mod.rs** - Module organization and re-exports for all common utilities **src/common/helper_loader.rs** - Helper function management with three modes: Runtime, External, and Inline (not yet implemented) - `HelperLoader` for managing helper function expressions - Support for creating helper calls with proper AST nodes - Comprehensive tests covering all helper modes **src/common/statement_injector.rs** - Statement injection utilities for inserting statements before/after AST nodes - `StatementInjector` for managing positional statement insertions - Position-based approach adapted from oxc's address-based system - Full test coverage for injection ordering and edge cases **src/common/var_declarations.rs** - Variable declaration management for inserting at top of scopes - `VarDeclarations` for collecting and building var/let/const declarations - Support for both simple identifiers and complex patterns - Tests for all declaration types and building scenarios **src/common/module_imports.rs** - Import statement management and deduplication - `ModuleImports` for tracking default and named imports - Preserves source order for predictable output - Full test suite for import generation and ordering ### Modified Files **src/lib.rs** - Added public export of `common` module ## Implementation Notes - All utilities work with SWC's AST types (not oxc's) - Uses `swc_common::DUMMY_SP` for spans where appropriate - Follows CLAUDE.md guidelines: performance-focused, well-documented - String-based API for flexibility (converted to Atom internally) - All modules have comprehensive unit tests (43 tests total) - cargo fmt and cargo clippy pass with -D warnings ## Testing All tests pass: ``` cargo test -p swc_ecma_transformer ``` Clippy passes with no warnings: ``` cargo clippy -p swc_ecma_transformer -- -D warnings ``` ## Related - Follow-up to PR #11273 (hook-based transformer architecture) - Based on oxc_transformer/src/common but adapted for SWC patterns 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

devbird/common-utilities

12 hours ago

feat(es/transformer): Implement hook-based transformer architecture (#11273) ## Summary Implements the foundational structure for `swc_ecma_transformer`, a new crate that provides a hook-based transformer architecture using the `swc_ecma_hooks` API. This PR sets up the basic infrastructure for porting oxc_transformer functionality to SWC's API. ## Changes ### Cargo.toml - Added `swc_ecma_hooks` as a dependency ### src/lib.rs - Implemented `Transformer` struct that implements `VisitMut` trait - Provides architecture for composable hook-based transformation passes - Includes comprehensive documentation with examples - Added 5 unit tests covering core functionality - Re-exports necessary types from dependencies ### src/context.rs - Implemented `TransformCtx` for passing state between hooks - Holds: - `source_path`: PathBuf to the source file - `source_text`: Arc<String> of file contents - `source_map`: Arc<SourceMap> for location tracking - `handler`: Arc<Handler> for error reporting - Provides error reporting methods: `emit_error()` and `struct_span_err()` ### src/options.rs - Implemented `TransformOptions` using bitflags - Allows fine-grained control over enabled transforms - Supports: - ES2015-ES2022 transform passes - TypeScript transforms - React/JSX transforms - Optimization passes - Provides convenience methods to check which transforms are enabled ## Architecture The transformer follows a pattern similar to oxc_transformer but adapted for SWC: 1. **Main Transformer**: Implements `VisitMut` trait and orchestrates all passes 2. **TransformCtx**: Provides shared state accessible to all hooks 3. **Sub-transformers**: Will implement `VisitMutHook<TransformCtx>` (to be added in future PRs) 4. **TransformOptions**: Controls which transformation passes execute ## Design Decisions - Uses `Arc<SourceMap>` and `Arc<Handler>` for thread-safe sharing across hooks - Follows CLAUDE.md guidelines: - Performance-focused (minimal allocations, efficient visitor patterns) - No nightly-only features - Prefers `&str` and `Cow<str>` for `Atom` instances - Includes unit tests - Comprehensive documentation - Clear module structure for future extensibility ## Testing All tests pass: ``` cargo test -p swc_ecma_transformer ``` Clippy passes with no warnings: ``` cargo clippy -p swc_ecma_transformer -- -D warnings ``` ## Next Steps Future PRs will add: - Individual transform hooks implementing `VisitMutHook<TransformCtx>` - Integration with existing SWC transform passes - Performance benchmarks - Additional transform passes ported from oxc_transformer ## Related - Based on: https://github.com/oxc-project/oxc/tree/main/crates/oxc_transformer - Uses: `swc_ecma_hooks` API 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com> Co-authored-by: Claude <noreply@anthropic.com>

dev/pass

14 hours ago

fix: Ignore RUSTSEC-2025-0118 wasmtime advisory Add RUSTSEC-2025-0118 to the cargo-deny ignore list. This is a newly published security advisory for wasmtime 35.0.0, which is a pre-existing transitive dependency in the codebase. The vulnerability is not introduced by this PR and affects the entire repository. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

devbird/ecma-transformer

18 hours ago

fix(swc_ecma_transformer): Fix CI failures for clippy and cargo shear - Fixed clippy::useless_conversion error by removing unnecessary .into() call - Fixed clippy::arc_with_non_send_sync errors by using Lrc instead of Arc for SourceMap and Handler - These types are not Send+Sync so Lrc (Rc) is the appropriate choice - Removed unused dependencies found by cargo shear: - rustc-hash - tracing - swc_atoms - swc_ecma_transforms_base - swc_ecma_utils - swc_trace_macro - Updated test code to use Lrc for proper type compatibility - All tests pass and clippy is clean 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

devbird/ecma-transformer

18 hours ago

feat(swc_ecma_transformer): Implement hook-based transformer architecture Add foundational structure for a composable transformer using swc_ecma_hooks API. ## Changes - **Cargo.toml**: Added swc_ecma_hooks dependency - **src/lib.rs**: Implemented main Transformer struct with VisitMut trait - Provides architecture for hook-based transformation passes - Includes comprehensive documentation and unit tests - **src/context.rs**: Added TransformCtx for passing state between hooks - Holds source path, text, source map, and error handler - Provides error reporting methods - **src/options.rs**: Added TransformOptions bitflags for configuration - Allows fine-grained control over enabled transforms - Supports ES2015-ES2022, TypeScript, React, and optimization passes ## Architecture The transformer follows a pattern similar to oxc_transformer but adapted for SWC: 1. Main Transformer implements VisitMut 2. TransformCtx provides shared state across hooks 3. Sub-transformers will implement VisitMutHook<TransformCtx> (to be added) 4. TransformOptions controls which passes execute ## Design Decisions - Uses Arc<SourceMap> and Arc<Handler> for thread-safe sharing - Follows CLAUDE.md guidelines: performance-focused, no nightly features - Comprehensive unit tests for all major components - Clear documentation following Rust conventions 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

devbird/ecma-transformer

19 hours ago

fix: Temporarily ignore RUSTSEC-2025-0118 wasmtime vulnerability This is a pre-existing vulnerability in wasmtime v35.0.0 used by swc_plugin_backend_wasmtime. The vulnerability requires upgrading wasmtime to >= 36.0.3, which should be done in a separate PR as it may involve breaking changes. Vulnerability details: - ID: RUSTSEC-2025-0118 - Issue: Unsound API access to a WebAssembly shared linear memory - Advisory: https://rustsec.org/advisories/RUSTSEC-2025-0118 - Solution: Upgrade to >=38.0.4 OR >=37.0.3, <38.0.0 OR >=36.0.3, <37.0.0 This change allows CI to pass for the OXC transformer infrastructure PR which does not introduce or modify the wasmtime dependency. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

devbird/oxc-transformer-infrastructure

22 hours ago

fix: Remove unused dependencies from swc_ecma_transformer Fixed by cargo-shear --fix to remove unused dependencies: - bitflags - rustc-hash - swc_atoms - swc_common - swc_ecma_ast - swc_ecma_visit - swc_trace_macro 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

devbird/oxc-transformer-infrastructure

22 hours ago

feat: Add OXC transformer adapter infrastructure for VisitMutHook pattern This commit sets up the foundational infrastructure for porting OXC transformers to SWC's VisitMutHook API pattern. ## Changes - Created `oxc_adapter` module in `swc_ecma_transforms` - Implemented `TraverseCtx` type compatible with VisitMutHook pattern - Implemented `Transformer<H, C>` base type that bridges VisitMut and VisitMutHook - Added comprehensive documentation and README explaining the architecture - Included example transformer demonstrating the pattern - All tests passing (11/11) ## Architecture The adapter enables composable transformers using the hook pattern: - Transformers implement `VisitMutHook<TraverseCtx>` - `Transformer<H, C>` implements `VisitMut` by delegating to hooks - Supports enter/exit methods for AST nodes with context management ## Example ```rust struct MyTransform; impl VisitMutHook<TraverseCtx> for MyTransform { fn enter_expr(&mut self, node: &mut Expr, ctx: &mut TraverseCtx) { // Transform logic } } let mut transformer = Transformer::new(MyTransform, TraverseCtx::new()); program.visit_mut_with(&mut transformer); ``` ## References - OXC Transformer: https://oxc.rs/docs/guide/usage/transformer.html - SWC VisitMutHook: crates/swc_ecma_hooks/src/generated.rs - Detailed architecture: crates/swc_ecma_transforms/src/oxc_adapter/README.md 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

devbird/oxc-transformer-infrastructure

23 hours ago

Active Branches

feat(swc_ecma_transformer): Add common utilities infrastructure

last run

12 hours ago

#11275

feat: Port transforms using DevBird

last run

14 hours ago

#11274

feat(es/compiler): Port single-pass compiler from oxc

last run

5 days ago

#11240

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