loadable-components: importAsync() not generating webpackChunkName magic comment

[wkeese]

Hi all. I'm trying to convert from Babel to SWC, but Webpack stopped generating chunks for dynamic imports in my server build.

My best guess is that this is because of the difference in output between @loadable/babel-plugin and @swc/plugin-loadable-components.

When using @babel/loadable-plugin, the output was

importAsync: () => Promise.resolve().then(() =>
_interopRequireWildcard(require(/* webpackChunkName: "components-JobRunningAnalysisAnimation-JobRunningAnalysisAnimation" */"./components/JobRunningAnalysisAnimation/JobRunningAnalysisAnimation"))).then(m => m.JobRunningAnalysisAnimation),

But when using @swc/plugin-loadable-components, the output is

importAsync: ()=>import("./components/JobRunningAnalysisAnimation/JobRunningAnalysisAnimation")
.then((m)=>m.JobRunningAnalysisAnimation),

or if I set the module.type to "commonjs", then

importAsync: ()=>Promise.resolve().then(()=>/*#__PURE__*/ 
_interop_require_wildcard(require("./components/JobRunningAnalysisAnimation/JobRunningAnalysisAnimation"))).then((m)=>m.JobRunningAnalysisAnimation),

It's weird because I see the webpackChunkName comment was generated in #300.

Is there a way to generate that webpackChunkName magic comment? Or is this a red herring and my problem is elsewhere?

PS: I see the magic comments being generated in the test files, like https://github.com/swc-project/plugins/blob/main/packages/loadable-components/tests/fixture/simple%20import/should%20transform%20path%20into%20chunk-friendly%20name/. But when I try the same thing locally, it doesn't get the magic comment:

import loadable from "@loadable/component";
loadable(() => import("../foo/bar"));

[wkeese]

Ah, I figured it out. I was trying to turn off minification, but inadvertently enabled it:

{
  "minify": false,
  "jsc": {
    "minify": {
      "compress": false,
      "mangle": false
    },
    "experimental": {
      "plugins": [
        ["@swc/plugin-loadable-components", {}],
    }
  },
}

The second minify section was actually stripping those magic comments.