227423d5f6
swc_ecma_ast: - Support `export v from 'foo';` swc_ecma_parser: - Support `export v from 'foo';` swc_ecma_codegen: - Fix codegen of side-effect imports |
||
|---|---|---|
| .cargo | ||
| .vscode | ||
| atoms | ||
| common | ||
| ecmascript | ||
| macros | ||
| scripts | ||
| src | ||
| testing | ||
| .gitignore | ||
| .gitmodules | ||
| .rustfmt.toml | ||
| .travis.yml | ||
| ARCHITECTURE.md | ||
| bors.toml | ||
| Cargo.toml | ||
| CONTRIBUTING.md | ||
| LICENSE-APACHE | ||
| LICENSE-MIT | ||
| README.md | ||
| rust-toolchain | ||
Make the web (development) faster.
Supporting swc
swc is a community-driven project, and is maintained by a group of volunteers. If you'd like to help support the future of the project, please consider:
- Giving developer time on the project. (Message us on Gitter 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]
Documentation
Check out the documentation in the website.
Installation
Currently this requires nightly version of rust.
npm i -D swc
or
yarn add --dev swc
Features
Parsers
- es2019
- jsx
- typescript
Transforms
New generation javascript to old-days javascript.
-
es3
- member-expression-literals
- property-literals
- reserved-words
-
es5
- property-mutators
-
es2015
- arrow-functions
- block-scoped-functions
- block-scoping
- Note: this might be buggy (at this time)
- classes
- computed-properties
- destructuring
- duplicate-keys
- for-of
- function-name
- instanceof
- literals
- new-target
- object-super
- parameters
- shorthand-properties
- spread
- sticky regex (
yflag) - template-literals
- invalid escape sequences inside tagged template literals. (aka es2018)
- typeof-symbol
- unicode-regex
-
es2016
- exponentiation-operator
-
es2017
- async-to-generator
-
es2018
- async-generator-functions
- dotall-regex
- object-rest-spread
- Using symbol as a key
- optional-catch-binding
- unicode-property-regex
-
react
- 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. You may also find the architecture documentation useful (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.