Generated by SassMeister.com.

input.scss

 @function foo($a, $b) {
     @return $a + $b;
}

@function bar($start) { 
    $output: $start;
    @for $i from 0 to 100 { 
        $output: $output + foo($i, 3)
    }
    @return $output
}

selector {
   single: foo(1, 2);
   multi_string: bar('');
   multi_number: bar(0);
}

output.css

selector {
  single: 3;
  multi_string: "3456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102";
  multi_number: 5250;
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.32.12",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}