Writing a plugin, I always get None for return_type

[drinking-code]

I want to write a plugin, but I've run into a problem I can't get around.
When running a visitor over an AST of a file like this:

class MyClass {
  myMethod(): string {
    return 'string';
  }
}

where there is a class with a method that has a return type, the return type I get from within the plugin is None (see repro here; run npm run to build and run example.

Am I doing something wrong or is this an actual bug in SWC? The parser recognises the return type; if I look at the AST output by the .parse() function, the return type is properly there. It is only from within the plugin where return_type is None

[magic-akari]

swc/crates/swc/src/config/mod.rs

Lines 709 to 738 in ed64833

	Optional::new(
	typescript::tsx::<Option<&dyn Comments>>(
	cm.clone(),
	typescript::Config {
	import_export_assign_config,
	verbatim_module_syntax,
	..Default::default()
	},
	typescript::TsxConfig {
	pragma: Some(
	transform
	.react
	.pragma
	.clone()
	.unwrap_or_else(default_pragma)
	),
	pragma_frag: Some(
	transform
	.react
	.pragma_frag
	.clone()
	.unwrap_or_else(default_pragma_frag)
	),
	},
	comments.map(|v| v as _),
	top_level_mark
	),
	syntax.typescript()
	),
	plugin_transforms,

The plugin_transforms pass is executed after the typescript pass.

swc/crates/swc/src/config/mod.rs

Lines 669 to 674 in ed64833

	let pass: Box<dyn Fold> = if experimental
	.disable_builtin_transforms_for_internal_testing
	.into_bool()
	{
	Box::new(plugin_transforms)
	} else {

There is an option to only run plugin_transforms. However, I am uncertain of its usability due to the presence of the word internal_testing in its name.

[drinking-code]

Thanks!
Setting disableBuiltinTransformsForInternalTesting: true gives me the type annotations inside the plugin.
(I think that's pretty weird behaviour, but so be it.)

Will see how far I get with this