swc.transform with experimental.emitIsolatedDts does not include comments in the output with preserveAllComments: true

[MillanWangGadget]

Describe the bug

swc.transform with experimental.emitIsolatedDts does not include comments in the output with preserveAllComments: true

Ideally, JSDoc comments could be preserved in the .d.ts output file

Input code

const result = await swc.transform(fullTextFromFile, {
  filename: filePath,
  jsc: {
    parser: {
      syntax: "typescript",
      tsx: true,
    },
    preserveAllComments: true, // Does not include comments in the emitted file
    experimental: {
      emitIsolatedDts: true,
    },
  },
});

Config

No response

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.7.25&code=H4sIAAAAAAAAA02OMQ7CMAxF95zij1AB3cvCgJBg7QmckNIg4lSJow5V704oHTr6P%2Ft911WlUKElP3wsHu01GEhPgjtGl3qMlOC4RBZpNCeJxKkL0SNkGbL8bi8DRfIgHJEkOn5hCTZIF8TZaxs3KFrJkVNBQb%2BtkdInfbEQP6HLRq26zEZcYKTlu1sZd9SsJQfoZpXuMSng78MEKgjzWc3qC9n9%2B5rdAAAA&config=H4sIAAAAAAAAA1WPSw7DIAwF9zkF8rrbdtE79BCIOhERP9mOVBTl7oUE0maH3xszsA5KwcwGnmotxzIkTYx0ziXhHER%2FSgKSE7IhmwRuvRWu1agd4x5tRwOiaUKpW8j3hoOLkbHjLfM22DH%2FC030iZD5ClZUh8nhVTc0Jfj4XvayfaQ%2B9tA%2F4Ad12XkxWH71TaEFh%2B0LYuVI0xQBAAA%3D

SWC Info output

No response

Expected behavior

The comments from the source file text to be included in the output

Actual behavior

No response

Version

"1.7.23"

Additional context

No response

[airhorns]

Looks like oxc also doesn't get the comments but is planning to fix it: oxc-project/oxc#5687

[airhorns]

Just to weigh in a little to help prioritize -- without comments, the emitIsolatedDts feature is not super useful in its current form. I think anyone building .d.ts files for consumption intends for them to be consumed by humans, like .d.ts files within node modules that power typechecking and autocomplete. Stripping all the nice documentation or explanation about these files makes those artifacts far far less useful for humans, and much different than the ones that the TypeScript compiler itself would produce.

I know this is probably a super annoying and invasive change to make to swc but as someone who adopted and then had to un-adopt the emitIsolatedDts experiment because of this missing piece, it'd be really great to get actual drop in compatibility with tsc! Also, I know it's marked experimental so no unfair expectations over here, just wanted to share.

[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.