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babel

Make the web (development) faster.

npm Downloads undefined

Travis Status Coverage

Supporting swc

Backers on Open Collective Sponsors on Open Collective

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 (y flag)
    • 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 (es3) 610 ops/sec ±1.76% (82 runs sampled)
swc (es2015) 682 ops/sec ±0.63% (88 runs sampled)
swc (es2016) 1,659 ops/sec ±4.32% (79 runs sampled)
swc (es2017) 1,384 ops/sec ±7.24% (82 runs sampled)
swc (es2018) 1,765 ops/sec ±11.78% (82 runs sampled)
swc-optimize (es3) 535 ops/sec ±1.01% (83 runs sampled)
babel 42.12 ops/sec ±6.27% (55 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.