swc-react-native

Collection of SWC(Rust) implementations for React Native.

Feature flag	Sub-crate	Upstream package
codegen	swc_react_native_codegen	@react-native/babel-plugin-codegen
worklets	swc_react_native_worklets	react-native-worklets/plugin

swc_react_native is the umbrella crate. No features are enabled by default — pick what you need (features = ["codegen"]) or turn on all for everything. Each sub-crate can also be depended on directly.

Prerequisites

• mise for environment management

Setup

mise install

This installs the Rust toolchain and just task runner as defined in mise.toml.

Development

All tasks are available via just:

just          # List all available recipes

Build

just build          # Debug build
just build-release  # Release build

Lint & Format

just lint       # Run clippy with strict warnings
just fmt        # Apply rustfmt
just fmt-check  # Check formatting without applying

Test

just test             # Run all tests
just snapshot-review  # Interactively review snapshot diffs (cargo insta review)

All-in-one

just roll  # lint + fmt-check + test

Benchmark

Measured on Apple M1 Pro, 200 iterations over the per-target fixtures in bench/<target>/fixtures/.

Target	Babel total	Babel avg / op	SWC total	SWC avg / op	Speedup
codegen	944.9ms	4.724ms	13.1ms	0.066ms	~72x
worklets	4554.4ms	22.772ms	61.3ms	0.307ms	~74x

Run with just bench <target> [n] (after just setup-bench <target> once).

Project Structure

crates/
  swc-react-native/                       # Umbrella crate — feature-gated re-exports of each transform
  swc-react-native-codegen/               # SWC visitor for the codegen transform
  swc-react-native-worklets/              # SWC visitor for the worklets transform

Upstream package	Rust location
@react-native/babel-plugin-codegen	crate swc_react_native_codegen
react-native-worklets Babel plugin	crate swc_react_native_worklets

LICENSE

MIT