@mixin form-validation-state-selector($state) {
  @if ($state == "valid" or $state == "invalid") {
    .was-validated #{if(&, "&", "")}:#{$state}:not(.skip-validation),
    #{if(&, "&", "")}.is-#{$state}:not(.skip-validation) {
      @content;
    }
  } @else {
    #{if(&, "&", "")}.is-#{$state}:not(.skip-validation) {
      @content;
    }
  }
}