import type { AttributeSeparatorOption } from './types';
/**
 * Checks if the given `attributeSeparator` is valid.
 *
 * @param attributeSeparator The `attributeSeparator` option.
 * @returns The given `attributeSeparator`.
 * @throws Error if the `attributeSeparator` was not valid.
 */
export declare function resolveAttributeSeparatorOption(attributeSeparator: AttributeSeparatorOption): AttributeSeparatorOption;