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input.scss

@use "sass:string";
@use "sass:color";


@function hex-digit($char) {
  $char: string.to-lower-case($char);
  @return if($char == "0", 0,
          if($char == "1", 1,
          if($char == "2", 2,
          if($char == "3", 3,
          if($char == "4", 4,
          if($char == "5", 5,
          if($char == "6", 6,
          if($char == "7", 7,
          if($char == "8", 8,
          if($char == "9", 9,
          if($char == "a", 10,
          if($char == "b", 11,
          if($char == "c", 12,
          if($char == "d", 13,
          if($char == "e", 14,
          if($char == "f", 15, 0))))))))))))))));
}

@function hex-to-int($hex) {
  $total: 0;
  $multiplier: 1;
  @for $i from string.length($hex) to 0 {
    $total: $total + hex-digit(string.slice($hex, $i, $i)) * $multiplier;
    $multiplier: $multiplier * 16;
  }
  @return $total;
}

@function str-to-color($str) {
  @return rgb(hex-to-int(string.slice($str, 2, 3)),
              hex-to-int(string.slice($str, 4, 5)),
              hex-to-int(string.slice($str, 6, 7)));
}

a {
  b: str-to-color("#33b5e5");
}

output.css

a {
  b: #33b5e5;
}

settings.json

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