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swc is a super-fast compiler written in rust; producing widely-supported javascript from modern standards and typescript.

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Make the web (development) faster.

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swc is a super-fast typescript / javascript compiler written in rust.


Check out the documentation in the website.


Please see comparison with babel.


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) | 2123 ops/sec ±0.84% (88 runs sampled) | | swc (es2017) | 2131 ops/sec ±1.13% (90 runs sampled) | | swc (es2018) | 2981 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) |

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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:

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See You may also find the architecture documentation useful (


swc is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).


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