import type { Properties } from 'hast';
import type { Directives } from 'mdast-util-directive';
/**
 * Creates a regex for matching the directive.
 */
export declare const createDirectiveRegex: (directiveName: string, alias: string | string[] | null | undefined) => RegExp;
/**
 * Call a function to get a return value or use the value.
 */
export declare function createIfNeeded<T extends Directives>(value: ((node: T) => Properties | null | undefined) | Properties | null | undefined, node: T): Properties | null | undefined;
/**
 * Merges the props of global, preset, and local into a single object:
 * - The order of precedence is: localProps > presetProps > globalProps.
 * - For class or className, do not override but merge into a new className.
 */
export declare function mergeProps(globalProps: Properties | null | undefined, presetProps: Properties | null | undefined, localProps: Record<string, string | null | undefined> | null | undefined): Properties;
/**
 * Process a URL by removing the protocol and shortening the path
 * to a maximum length.
 */
export declare function processUrl(url: string, maxPathLength?: number): string;