text: import {Style} from '@flexio-oss/stylist'
  
  /**
   * @interface
   */
  export class LayersStyle extends Style {
  
    /**
     * @return {string}
     */
    container() {
      throw new Error('should be override')
    }
  
    /**
     * @return {string}
     */
    layer() {
      throw new Error('should be override')
    }
  
    /**
     * @return {string}
     */
    layerActive() {
      throw new Error('should be override')
    }
  
  }
  
  /**
   *
   * @param instance
   * @return {boolean}
   */
  export const isLayers = (instance) => instance instanceof LayersStyle
  