Generated by SassMeister.com.

input.scss

foo {
    background: red;
    bar {
        background: green;
    }
}

output.css

foo {
  background: red;
}
foo bar {
  background: green;
}

settings.json

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