// return transition list from a list of properties
// @param $property {string|list} property list
// @param $duration {string} transition duration
// @param $easing {string} easing function
// @return transition list
@function make-transition($property, $duration, $easing) {
  $result: ();
  @if (type-of($property) == 'string') {
    $property: ($property);
  }
  @each $prop in $property {
    $declaration: $prop $easing $duration;
    $result: append($result, $declaration, $separator: comma);
  }
  @return $result;
}