Comments in CSS may be mangled if the comment contain a newline

[ericcornelissen]

Bug Report

• Package(s): language-css
• Version(s): v0.1.26

Description

When mangling a CSS stylesheets with comments, the language-css plugin might accidentally mangle in comments if the comment contains a newline.

Proof of Concept

1. Have a CSS file with mangle-able CSS in a CSS comment (/* */). For example:

   .cls-foo {
     color: purple;
   }
   
   /*
   .cls-bar {
     color: orange;
   }
   */

2. Run WebMangler CLI (version 0.1.6) with WebMangler Core (version 0.1.24) and the default mangler plugins & default language plugins (at the exact versions found in the WebMangler Core package.json).

3. Observe that the comments have been mangled. For the example above:

   .a {
     color: purple;
   }
   
   /*
   .b {
     color: orange;
   }
   */