import type { AttributeToken } from 'pug-lexer';
import type { EmptyAttributesForceQuotesOption, EmptyAttributesOption } from './types';
/**
 * Formats the token's `val` if it's empty, based on the `pugEmptyAttributes` option.
 *
 * @param token The attribute token.
 * @param emptyAttributesOption The option.
 * @param emptyAttributesForceQuotesOption Array with string-patterns for attribute names that needs empty quotes.
 */
export declare function formatEmptyAttribute(token: AttributeToken, emptyAttributesOption: EmptyAttributesOption, emptyAttributesForceQuotesOption: EmptyAttributesForceQuotesOption): void;