import { type DeclarativeElementDefinition } from './declarative-element.js';
/**
 * Asserts that the given input is a declarative element definition.
 *
 * @category Util
 * @see
 * - {@link isDeclarativeElementDefinition}
 */
export declare function assertDeclarativeElementDefinition(input: unknown, failMessage?: string | undefined): asserts input is DeclarativeElementDefinition;
/**
 * Checks that the given input is a declarative element definition.
 *
 * @category Util
 * @see
 * - {@link assertDeclarativeElementDefinition}
 */
export declare function isDeclarativeElementDefinition(input: unknown): input is DeclarativeElementDefinition;