Generated by SassMeister.com.

input.scss

@mixin button ($a, $b, $c) {
    color: $a;
    border: $b;
    content: $c;
}

.foo {
    @include button(#{theme('colors.white')}, 1px solid blue, 'hi')
}

output.css

.foo {
  color: theme("colors.white");
  border: 1px solid blue;
  content: "hi";
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.26.11",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}