Make the web (development) faster.
Supporting swc
swc is a community-driven project, and is maintained by a group of [volunteers](https://opencollective.com/swc#team). If you'd like to help support the future of the project, please consider:
- Giving developer time on the project. (Message us on [Gitter](https://gitter.im/swcproject/Lobby) for guidance!)
- Giving funds by becoming a sponsor (see below)!
## Open Collective Sponsors
Become a sponsor and get your logo on our README on Github with a link to your site. [[Become a sponsor](https://opencollective.com/swc#sponsor)]
# Documentation
Check out the documentation [in the website](https://swc-project.github.io/docs/introduction).
# Installation
Currently this requires nightly version of [rust][].
```sh
npm i -D swc
```
or
```sh
yarn add --dev swc
```
# Features
## Parsers
- [x] es2019
- [x] jsx
- [x] typescript
## Transforms
New generation javascript to old-days javascript.
- es3
- [x] member-expression-literals
- [x] property-literals
- [x] reserved-words
- es5
- [ ] property-mutators
- es2015
- [x] arrow-functions
- [x] block-scoped-functions
- [x] block-scoping
- Note: this might be buggy (at this time)
- [x] classes
- [x] computed-properties
- [x] destructuring
- [x] duplicate-keys
- [x] for-of
- [x] function-name
- [x] instanceof
- [x] literals
- [x] new-target
- [ ] object-super
- [x] parameters
- [x] shorthand-properties
- [x] spread
- [x] sticky regex (`y` flag)
- [x] template-literals
- [ ] invalid escape sequences inside tagged template literals. (aka es2018)
- [x] typeof-symbol
- [ ] unicode-regex
- es2016
- [x] exponentiation-operator
- es2017
- [x] async-to-generator
- es2018
- [ ] async-generator-functions
- [ ] dotall-regex
- [x] object-rest-spread
- [ ] Using symbol as a key
- [ ] optional-catch-binding
- [ ] unicode-property-regex
- react
- [x] jsx
# Performance
The lower bound of the speedup compared to babel is **16**. The benchmarks were run on Macbook pro, dual core, 2.3GHz Intel Core i5, 16 GB ram
| | performance |
| ------------------------ |:--------------------------------------:|
| swc (ffi) | 1,086 ops/sec ±0.77% (84 runs sampled) |
| swc-optimize (ffi) | 1,060 ops/sec ±0.63% (87 runs sampled) |
| swc (ffi, simd) | 1,295 ops/sec ±0.87% (89 runs sampled) |
| swc-optimize (ffi, simd) | 1,270 ops/sec ±0.24% (89 runs sampled) |
| babel | 65.72 ops/sec ±6.45% (62 runs sampled) |
## Contributing
See [CONTRIBUTING.md](CONTRIBUTING.md). You may also find the architecture
documentation useful ([ARCHITECTURE.md](ARCHITECTURE.md)).
## License
swc is primarily distributed under the terms of both the MIT license
and the Apache License (Version 2.0).
See LICENSE-APACHE and LICENSE-MIT for details.
[babel]:https://github.com/babel/babel
[closure compiler]:https://github.com/google/closure-compiler
[rust]:https://www.rust-lang.org