/**
 * Input validators — validate options before processing begins.
 *
 * Failing fast at configuration time (not mid-stream) gives
 * developers clear, actionable error messages.
 */
import type { CsvSuperOptions } from '../types/index.js';
/**
 * Validates all options passed to csvSuper() and returns a
 * Required<CsvSuperOptions> object with all defaults filled in.
 * Throws a CsvSuperError with a descriptive message on invalid input.
 */
export declare function validateOptions(options: CsvSuperOptions): Required<CsvSuperOptions>;
/**
 * Validates that a file path is a non-empty string.
 */
export declare function validateFilePath(filePath: unknown): asserts filePath is string;
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