Expose use_define_for_class_fields in SWC config

[cafreeman]

Describe the feature

When compiling a class with class fields using TypeScript syntax, SWC currently down-levels class fields no matter what version of JS is being targeted.

In other words, this:

class Foo {
  foo = 'foo';
}

gets turned into this:

class Foo {
    constructor(){
        this.foo = 'foo';
    }
}

no matter what config options you use.

However, the capability to avoid this down-leveling already exists in SWC (and is even tested!) but is unfortunately simply not exposed as a config option in the the SWC config itself.

Could you please provide a way to actually enable this feature in the SWC config?

Babel plugin or link to the feature description

No response

Additional context

No response

[magic-akari]

setPublicClassFields

[cafreeman]

Hmmm, interesting, but both Babel and SWC preserve class fields when targeting the latest version of ES. SWC only tweaks the class fields when using the TypeScript syntax, so I'm not sure this assumption is playing a role here.

[Austaras]

No, typescript has its seperate class field transform pass

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.