compile with swc

[sachinraja]

Feel free to close this PR if it is too experimental to use. It switches out babel for swc, a super-fast javascript compiler written in rust. Building the repo is 20x faster (123.29ms) compared to babel (2848ms). I realize this is a minimal difference, but it is still faster. SWC is applied to the test (@swc/jest) and script files (@swc/register) too.

Notes

• Next.js recently added support for compiling their server and client files.
• Deno uses swc
• Parcel's new compiler runs on top of swc

[ghost]

Can you compare it to https://github.com/evanw/esbuild ?

[sachinraja]

I don't see the benefits of doing that. This project currently uses babel, which is a compiler, not a bundler. The way I see it is swc is like babel and esbuild is like webpack.

[reinink]

Hey we'd like to merge this, but the tests are currently failing because swc isn't maintaining the export order of our plugins (in corePlugins.js). If you can think of a solution for this and want to implement it, that would be great. Otherwise we'll get to this eventually and get it merged. Thanks for submitting this!

[sachinraja]

Are you sure? Looking at the CI errors, it seems like swc failed to install.

Just tried it and it seemed to be a combination of those errors. Installing the latest versions for swc resolved the script errors, but the tests are failing because of the export order.

I don't believe Node itself even guarantees that the order will be kept with a wildcard import (looks to be sorting alphabetically). I think the way to do it would be to have a more explicit ordering system.

[RobinMalfait]

Hey! Thank you for your PR!
Much appreciated! 🙏

I had to rebase and bump some versions and had no push rights. That said, @sachinraja you are still marked as a contributor on the other PR I opened #5593.

Thank you for your initial work!

[sachinraja]

Awesome, glad to see this merged!