[Bug]: Not Playing Well With Sass `@extend` Syntax

[fweth]

Describe the bug

Not sure if this is in the responsibility of PurgeCSS, but when I have this SCSS file:

@import "bootstrap/scss/bootstrap";
/* purgecss start ignore */
.rte {
  a {
    @extend .text-decoration-underline, .link-offset-3;
  }
  blockquote {
    @extend .blockquote, .ms-4,.mt-5, .fs-4;
  }
}
/* purgecss end ignore */

then it doesn't create classes for a or blockquote if it can't find the classes inside the @extend clause in the wild. So I don't know how the pre-processed CSS handed from Sass to PurgeCSS exactly looks like and if PurgeCSS even has a change to fix this, but it's still not the behaviour I expected.

To Reproduce

Compile the SCSS code from with Sass and PurgeCSS, e.g. via Vite.js.

Expected Behavior

PurgeCSS should create styles for .rte a and .rte blockquote even when it doesn't encounter the Bootstrap classes the files it looks through.

Environment

Node 18

Add any other context about the problem here

No response

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