@function each($brightness-config) {
  @each $key, $brightness in $brightness-config {
    $brightness-config: map.set(
      $brightness-config,
      $key,
      (
        --bs-brightness: brightness($brightness),
      )
    );
  }
  @return $brightness-config;
}

$utilities: map-merge(
  $utilities,
  (
    "brightness": (
      property: --bs-brightness,
      class: brightness,
      variants: brightness,
      values: each($brightness-config),
    ),
  )
);