• Laravel Mix Version: 6.0.9
• Node Version: 14.15.0
• NPM Version: 6.14.8
• OS: Win10

Description:

sass() step won't allow to transverse to project's root in V6, Below was working fine in V5.

Steps To Reproduce:

Example mix file:

const mix = require('laravel-mix');

const dest = 'public/front';

mix
  .setPublicPath(dest)
  .js('resources/js/front.js', `${dest}/app.js`)
  .vue()
  .extract()
  .options({
    processCssUrls: false,
  })
  .sass('resources/scss/front.scss', `${dest}/app.css`)
  .sass('resources/scss/mail.scss', '../../resources/views/vendor/mail/html/themes/default.css'); // <-- V5 working example

V6 Error:

[webpack-cli] [Error: EINVAL: invalid argument, mkdir 'C:\Apps\xampp\htdocs\cspu\public\front\C:\Apps\xampp\resources\views\vendor\mail\html\themes'] {
  errno: -4071,
  code: 'EINVAL',
  syscall: 'mkdir',
  path: 'C:\\Apps\\xampp\\htdocs\\cspu\\public\\front\\C:\\Apps\\xampp\\resources\\views\\vendor\\mail\\html\\themes'
}

Might be related to setPublicPath()? Looks like it resolves to absolute and when absolute path used in sass too, output resolves in concatenated two absolutes paths. Though, it looks like it tries to transverse, see the segments of the second absolute path.