@error

@error

The @error directive throws the value of a SassScript expression as a fatal error, including a nice stack trace. It’s useful for validating arguments to mixins and functions. For example:

@mixin adjust-location($x, $y) {
  @if unitless($x) {
    @error "$x may not be unitless, was #{$x}.";
  }
  @if unitless($y) {
    @error "$y may not be unitless, was #{$y}.";
  }
  position: relative; left: $x; top: $y;
}

There is currently no way to catch errors.