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Rust-based platform for the Web
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Implement object rest / spread (#98) 
swc_ecma_parser:
 - improve parser's tests
It now shows the code failed to parse
 - allow rest pattern in catch clause
 - fix parsing of named export (semicolon)

swc_ecma_transforms:
 - implement array spread
 - add helper methods (objectWithoutProperties)
 - add some fast paths
 - make es2015::parameters handle catch clauses
 - don't show helpers when execution failed
 - export fixer
2018-12-26 17:09:48 +09:00
.cargo Make it thread safe 2018-11-17 17:02:34 +09:00
.vscode Performance & Node binding (#84) 2018-12-21 16:54:36 +09:00
atoms More works (#66) 2018-11-18 14:00:07 +09:00
common implements async to generator (#91) 2018-12-24 10:58:40 +09:00
ecmascript Implement object rest / spread (#98) 2018-12-26 17:09:48 +09:00
macros Performance & Node binding (#84) 2018-12-21 16:54:36 +09:00
scripts ECMAScript parser (#1) 2018-01-12 16:53:06 +09:00
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.travis.yml Es2015 (#80) 2018-11-28 12:24:08 +09:00
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README.md

speedy web compiler

Build Status codecov

Make the web (development) faster.

swc is rust port of babel and closure compiler.

Installation

Currently this requires nightly version of rust.

npm i -D swc

or

yarn add --dev swc

Features

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 (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

Performance

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.