6fa85b646f
swc_ecma_preset_env: - can inject polyfills automatically - can apply transforms automatically swc: - added env config to .swcrc |
||
|---|---|---|
| .cargo | ||
| .github | ||
| .vscode | ||
| atoms | ||
| common | ||
| ecmascript | ||
| examples | ||
| macros | ||
| scripts | ||
| src | ||
| testing | ||
| tests | ||
| .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 Slack for guidance!)
- Giving funds by becoming a sponsor (see below)! Slackin for swc
Open Collective Sponsors
Become a sponsor and get your logo on our README on Github with a link to your site. [Become a sponsor]
Gold Sponsors
Silver Sponsors
Bronze Sponsors
Backers
Become a backer and get your image on our README on Github with a link to your site.
Documentation
Check out the documentation in the website.
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
- 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
-
es2019 (stage 4)
-
optional catch binding
-
big int literal
-
stage 3
-
class fields
-
numeric separator
-
nullish coalescing
-
stage 2
-
decorators
-
react
- jsx
-
preset-env
entrywith core-js@2/3usagewith core-js@2/3 It's implemented, but it's not perfect.
Performance
The lower bound of the speedup compared to babel is 18. The benchmarks were run on Macbook pro, dual core, 2.3GHz Intel Core i5, 16 GB ram
| performance | |
|---|---|
| swc (es3) | 761 ops/sec ±0.23% (89 runs sampled) |
| swc (es2015) | 800 ops/sec ±1.02% (87 runs sampled) |
| swc (es2016) | 2,123 ops/sec ±0.84% (88 runs sampled) |
| swc (es2017) | 2,131 ops/sec ±1.13% (90 runs sampled) |
| swc (es2018) | 2,981 ops/sec ±0.25% (90 runs sampled) |
| swc-optimize (es3) | 712 ops/sec ±0.21% (86 runs sampled) |
| babel | 41.75 ops/sec ±8.07% (56 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.