Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

@function to-list($value, $keep: 'both') {
  $keep: if(index('keys' 'values', $keep), $keep, 'both');

  @if type-of($value) == map {
    $keys: ();
    $values: ();
    @each $key, $val in $value {
      $keys: append($keys, $key);
      $values: append($values, $val);
    }

    @if $keep == 'keys' {
      @return $keys;
    }
    @else if $keep == 'values' {
      @return $values;
    }
    @else {
      @return zip($keys, $values);
    }
  }

  @return if(type-of($value) != list, ($value,), $value);

}

$transitions: (
  width: .5s,
  height: 1s,
  margin: 1.5
);

//$transition: to-list($transitions, 'both');

.box{
  transition: to-list($transitions, 'both');;
}

SassMeister-output.css

.box {
  transition: width 0.5s, height 1s, margin 1.5;
}