import { FrontmatterContent } from 'mdast';
import { Node } from 'unist';
/**
 * Type guard for FrontmatterContent.
 *
 * @param node - The node to test.
 * @returns True if node is FrontmatterContent.
 */
export declare function isFrontmatterContent(node: Node): node is FrontmatterContent;
/**
 * Type assertion for FrontmatterContent.
 *
 * @param node - The node to test.
 */
export declare function assertFrontmatterContent(node: Node): asserts node is FrontmatterContent;