import-only files not in sourcemap

[htho]

I have file that has only @import rules, but nothing else.
This file can not be found in the sourcemap.
If I add a dummy comment, the file is in the sourcemap.

Maybe this is related to: #81?

I created a minimally working example:
https://github.com/htho/mwe-postcss-import-sourcemap-import-only

[RyanZim]

PR welcome to fix this.

[htho]

Puh.

I wouldn't even know where to start. I have no clue about the interaction between postcss and postcss-import.

[romainmenke]

If I add a dummy comment, the file is in the sourcemap.

That is the only way to "fix" this.

postcss-import removes @import statements and anything that is imported will be coming from other files.

If a file contains only @import statements it will never be part of the source maps.

We could automatically add a comment with the @import statement as comment text :
/* @import "foo.css" */

But any half decent minifier will scrub comments, re-introducing the issue.

---

I am also unsure what the use case is.
Technically the file is missing from the source maps, but is this a problem?
Sourcemaps should still work for all other CSS.

If so, which problem?
Are there alternative solutions?

[romainmenke]

We could automatically add a comment with the @import statement as comment text :
/* @import "foo.css" */

esbuild seems to do something like this.

---

style.css :

@import url("a.css");

a.css :

.box {
	background-color: green;
}

becomes :

/* tests/001-core-features/001/default/a.css */
.box {
  background-color: green;
}

/* tests/001-core-features/001/default/style.css */

[RyanZim]

If someone wants this badly enough they're willing to submit a PR, we can consider it. But I don't see the point of adding it just for the sake of it. So far, one request in ~4 years; doesn't seem to be a common need.

[romainmenke]

Yeah, I also fail to see the issue.

I don't think the fact that it's missing from a sourcemap is breaking anything or can cause any inconvenience.