feature request: support swc

[punkeel]

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

swc is a serious project with 10k stars on GitHub. It is used in Deno to transpile TypeScript code into JS. I'm not 100% sure, but there may be a WebAssembly version exposing parse / codegen functions.

It would be great to add support for swc in astexplorer.

cc @kdy1

[RReverser]

I'm not 100% sure, but there may be a WebAssembly version exposing parse / codegen functions.

It seems to have it right in the tree you provided: https://github.com/swc-project/swc/tree/master/wasm. If you can find or publish an npm package for bindings (see my https://github.com/RReverser/astexplorer-syn for an example), it should be fairly straightforward to integrate into ASTExplorer.

[punkeel]

Indeed, swc/wasm exists and is deployed to npm. It's targeting nodejs, so I've opened swc-project/swc#1277 to add a web version of it. I'll try playing a bit with AST Explorer to see if I can add support there, thanks for the syn pointer!

[punkeel]

I've pushed a WIP pr #556 that has the following known issues:

1. It doesn't build, as @swc/wasm isn't meant to be used from browsers. To test it locally, I've manually built a browser-friendly version and replaced the node_modules/... files. See issue linked above in swc project.
2. When the code (or a setting) is changed, Autofocus is broken. Would you have any ideas what could cause this?

Thinking it could be WebAssembly shenanigans, I've tried wrapping the parseSync call in JSON.parse(JSON.stringify(...)), but it didn't help.

Aside from that, it was really easy to integrate in AST Explorer, ✨ magic ✨ !

[RReverser]

Aside from that, it was really easy to integrate in AST Explorer, ✨ magic ✨ !

Glad you liked it :) I've set it up a long time ago, and sometimes felt bad about all the Webpack magic it's doing, but it does seem to make contributions easier.

[punkeel]

A first version of @swc/wasm-web was published, but another release is required to fix a bug, see swc-project/swc#1291.

I've started working on a swc transformer, and it was just as easy as adding a parser to AST Explorer (yay!). :)

I'll update the PR to include this transformer, and I've prepared another PR (#557) to replace http-server in dev with light-server, the former sending the proper Accept header for .wasm files.

For now, the transformer accepts a JSON object. I think swc-project/swc#1275 is needed before full-fledged plugins can be written, as they'd rely on @swc/core, even if it's just for types.

cc @9oelM

[9oelM]

@punkeel hi!

It seems that swc does not run something like a nightly build, which is the reason I had to build web wasm of swc myself and manually include it in 9oelm.github.io/swc-wasm-demo. It'd be great if swc would support nightly build (I'm open to helping if possible, too), although I'm not sure if this is the proper repo to talk about this 😅

Also i find that we got a lot to work on the wasm side of swc like what you said

[ShayRubach]

@9oelM TLDR - Is the swc type for ASTExplorer is fully working? And if so, how do I get an access to it? Any PR open or something?

[0xdevalias]

Given that the following PR has been merged and swc seems to be supported now, should this issue be closed?

• feat(parser): add swc support via @swc/wasm-web #637

[mantou132]

Currently "Autofocus" does not work when decorators are enabled?