import { type DeclarativeElement } from './declarative-element.js';
/**
 * Checks if the input is an instance of a DeclarativeElement, the super class of all custom
 * elements defined with element-vir.
 *
 * @category Util
 */
export declare function isDeclarativeElement(input: unknown): input is DeclarativeElement;
/**
 * Checks if the input is an instance of a DeclarativeElement, the super class of all custom
 * elements defined with element-vir.
 *
 * @category Util
 */
export declare function assertIsDeclarativeElement(input: unknown): asserts input is DeclarativeElement;