@function kabab-case() {
  @return 'foo';
}

@function snake_case() {
  @return 'foo';
}

@function camelCase() {
  @return 'foo';
}

@function PascalCase() {
  @return 'foo';
}

@function Camel_Snake_Case() {
  @return 'foo';
}

@function SCREAMING_SNAKE_CASE() {
  @return 'foo';
}

@function _with-leading-underscore() {
  @return 'foo';
}

@function _does_NOT-fitSTANDARD($x) {
  @return $x;
}

$foo: SCREAMING_SNAKE_CASE();

.class {
  content: snake_case();
  color: _does_NOT-fitSTANDARD('bar');
  border-color: $foo;
  transform: translateX(1px) translateY(1px) translateZ(1px) scaleX(0.5) scaleY(0.5) scaleZ(0.5) skewX(1deg) skewY(1deg) rotateX(1deg) rotateY(1deg) rotateZ(1deg);
}