import type { GtfsValidatorOptions } from './interfaces/index.js';
/**
 * Validates options object and normalizes values.
 *
 * @param options - The options to validate
 * @returns Normalized options
 * @throws {GtfsValidationError} If options are invalid
 *
 * @internal
 */
export declare function validateOptions(options?: GtfsValidatorOptions): GtfsValidatorOptions;