how to start contributing?
Hi team. I'm new to https://github.com/swc-project/swc but already think I'm a fan of the project. How do I get started on contrubuting?
Use `swc_ecma_compat_es2017::async_to_generator` for conditional async transformations
Hey team, I've been working on a plugin that takes
async functions and transforms them to generators for usage with mobx flows. I've gotten reasonably far but came across: https://docs.rs/swc_ecma_compat_es2017/latest/src/swc_ecma_compat_es2017/async_to_generator.rs.html#39-46
This transformation is exactly what i've been aiming for and would make for a far more robust solution, as what i've written so far handles the conditional cases as I expect.
The issue i'm running into is that I'd like to instantiate the AsyncToGenerator visitor to visit_children_with it when the conditions are met to perform this transformation, but async_to_generator returns Pass which does not satisfy VisitMut...minify output to gzip
Noob question how i can output it to minify gzip file using swc minify? is there a config? thanks
Changelog for minifier
Hi all,
My company uses the minifier component of swc. Recently, we migrated from v1.9.3 of core to v1.11.9, and we saw a huge upwards spike in cumulative layout shift (CLS) reported from real users' browsers. is there any significant changes that could account for this?...
How to handle the execution order of WASM plugins
Hello, I'm developing a plugin to transform code in Rust.
It seems that the options provided by SWC (e.g.,
externalHelpers, env.targets, ...) are processed after all plugins have completed execution.
For example, if I want a plugin to execute after the externalHelpers transformation, is there any approach I can try?...Solution:
You could try invoking transform twice
Comments not going on new lines always
Hi all,
Trying to port a sprockets codebase using jquery v1 (I know, I hate it too) from TSC (v2) to swc. I'm having trouble with it though, as its placing the sprockets require calls on the end of lines when the previous line closes a multi-line comment. Does anyone know a way to work around this?...
How can keep css comments after codegen?
Hello friends, in rust I can not be able to keep comments for a css file or content
for example as you see I return the comments in lexer
Some(&comments), but it deletes the comments
```rust...How to set "paramtypes" metadata in Javascript?
I'm currently working on NodeJs/Javascript setup (no typescript) that relies on decorators. Unfortunately I'm not able to convince swc to emit correct metadata. Here's an example
```javascript
function decorator() {}
...
Solution:
You can’t
Encountering SIGBUS intermittently
Hey – regarding this https://github.com/swc-project/swc/discussions/9996
Encountering the following error on CI but unable to reproduce it locally, when using
@swc/jest:
```
● Test suite failed to run...Any examples of maintaining same plugin for babel and swc?
Hey!
I'm trying to think about making an swc compatible plugin for some existing babel plugins, but unfortunately the plugins I'm trying to migrate are quite complex, and long!
One of the concerns about writing a new plugin in rust has been the possibility of behaviour drift as, we can't drop the babel plugins yet for older consumers....
Emitter in SWC does not add expected space after '=>' in Arrow Functions
Hello friends, I am new to rust and SWC, I hope I am not wasting your time 🥹🙏🏻
I edited with extra space.
```javascript
// This is first test we need to have
console.log("We are here");...
Does SWC remove comments in the code when transforming a JS file's AST and converting it back to a c
Hello friends, I'm quite new to Rust. Recently, I used OXC in my Elixir project with NIF to modify JS files in my CLI. Unfortunately, after making changes to the JS file, all the comments above functions or within the code are removed, which is a major issue for me. Before diving into SWC, I wanted to ask if this library exhibits the same behavior.
My next question is whether SWC supports converting the entire AST to JSON and vice versa, particularly from JSON back to AST.
My current requirement is focused on JS files.
Thanks in advance!...
Compile .node DSO on freebsd
I posted this in the wrong place, my apologies…
so I tried compiling for wasm, as suggested, but the instructions from the AI really didn't work, and I'm not familiar enough with rust and swc to know really what that means... it suggested adding a section to the next config to use the swc-wasm pkg from the bindings folder, but that didn't work. I tried yarn adding the @next/swc-freebsd-x64 package, which seems to satisfy the error checking, but does not yield a built project -- probably because that hasn't been updated since 13.x, and I am trying to use next 14.2.5 (happy to upgrade to 15 if that would help)... any other thoughts? This is my current output running yarn build:
yarn run v1.22.22...
Parsing error
Are there specific settings that allow me to parse the following code?
```
function test() {
(arguments = x)[1] = {};
}...
1:1 line number mapping
Is there a way to have line numbers in typescript be the same line numbers as javascript? For example, if there's a statement on line 17 in the TS source, SWC would put it on line 17 in the generated JS
I'm using the Rust API...
how to migrate from visit_mut_with to Pass?
I'm upgrading the swc dependency for the qwik optimizer (https://github.com/QwikDev/qwik/blob/2ed63b78bd4a20b0f96b4e6fba9ae396916f2321/packages/qwik/src/optimizer/core/src/parse.rs#L266) and it looks like I need to convert
```rust
program.visit_mut_with(&mut typescript::strip(
Default::default(),
top_level_mark,...
preset-env support
So, in short, I've bumped into the following info (was even updated somewhat recently).
What I wanna know: is that a fact? Can someone point me to
/*#__PURE__*/ annotation handles/config/settings/API? (specifically, I'm in need of what @babel/plugin-transform-react-pure-annotations does, since their absence/incorrectness is kind of detrimental to tree-shaking)
Oh and, hello authors of the least rusty swc 😄...
Plugin panics when trying to read line number from SourceMapper
I've got a plugin where part of the logic involves reading the current line number:
```rs
pub struct MyVisitor {
// Provided by in from TransformPluginProgramMetadata...
how can I mark a context?
I'm trying to mark a call expression for checking if I visited it later, but this doesn't print that it worked:
```rs
impl VisitMut for CleanMarker {
fn visit_mut_module_item(&mut self, node: &mut ast::ModuleItem) {
if let ast::ModuleItem::Stmt(ast::Stmt::Expr(expr)) = node {...
wasm build uses old swc libraries?
I'm a Rust newbie, maybe I'm doing something wrong.
I have everything building natively with the latest swc.
However, when I try to build for wasm, it's giving errors that indicate it's still using the old API?
```...