8d5670e72b
**Description:** This is a part of https://github.com/swc-project/swc/pull/9230. I profiled the performance, and `thread_local` took too long to get the address of the thread-local variable. So, I inlined the reference into the allocator. # Benchmark result ``` Gnuplot not found, using plotters backend common/allocator/alloc/std/1000000 time: [4.9478 ms 4.9653 ms 4.9922 ms] Found 17 outliers among 100 measurements (17.00%) 4 (4.00%) high mild 13 (13.00%) high severe common/allocator/alloc/no-scope/1000000 time: [5.4821 ms 5.4938 ms 5.5068 ms] Found 17 outliers among 100 measurements (17.00%) 2 (2.00%) high mild 15 (15.00%) high severe common/allocator/alloc/scoped/1000000 time: [3.1401 ms 3.1456 ms 3.1518 ms] Found 12 outliers among 100 measurements (12.00%) 3 (3.00%) high mild 9 (9.00%) high severe common/allocator/alloc/cached-no-scope/1000000 time: [5.0992 ms 5.1090 ms 5.1198 ms] Found 11 outliers among 100 measurements (11.00%) 2 (2.00%) high mild 9 (9.00%) high severe common/allocator/alloc/cached-scoped/1000000 time: [3.0191 ms 3.0230 ms 3.0273 ms] Found 11 outliers among 100 measurements (11.00%) 2 (2.00%) low mild 1 (1.00%) high mild 8 (8.00%) high severe ``` |
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| CONTRIBUTING.md | ||
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Make the web (development) faster.
SWC (stands for Speedy Web Compiler) is a super-fast TypeScript / JavaScript compiler written in Rust. It's a library for Rust and JavaScript at the same time. If you are using SWC from Rust, see rustdoc and for most users, your entry point for using the library will be parser.
Also, SWC tries to ensure that
If you select the latest version of each crates, it will work
for rust users.
MSRV of crates is currently 1.71.
To update all SWC crates you use, you can run curl https://raw.githubusercontent.com/swc-project/swc/main/scripts/update-all-swc-crates.sh | bash -s. This script will update all dependencies to the latest version and run cargo build to ensure that everything works.
Note that you need
jqcargo upgrade
command to run the script.
If you are using SWC from JavaScript, please refer to docs on the website.
Documentation
Check out the documentation in the website.
Features
Please see comparison with babel.
Performance
Please see benchmark results on the website.
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 Discord (preferred) or Github discussions for guidance!)
- Giving funds by becoming a sponsor (see https://opencollective.com/swc)!
Contributing
See CONTRIBUTING.md. You may also find the architecture documentation useful (ARCHITECTURE.md).
License
SWC is primarily distributed under the terms of the Apache License (Version 2.0).
See LICENSE for details.