import type { PpmInput, PpmResult } from './types.js';
/**
 * Convert between PPM, defect rate, and sigma level
 *
 * @param input - PPM conversion input
 * @returns PPM conversion result with all metrics
 * @throws {RangeError} defectRate outside [0, 100], ppm outside [0, 1,000,000], or
 *   sigma outside [0, 6] (this converter's supported short-term sigma domain with the
 *   conventional 1.5σ shift). Values were previously clamped silently, substituting a
 *   different quality level than requested.
 */
export declare function ppm(input: PpmInput): PpmResult;
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