discourse/app/assets/javascripts/admin/addon/components/setting-validation-message.gjs

import Component from "@ember/component";
import icon from "discourse/helpers/d-icon";

export default class SettingValidationMessage extends Component {
  <template>
    <div class="validation-error {{unless this.message 'hidden'}}">
      {{icon "xmark"}}
      {{this.message}}
    </div>
  </template>
}