/**
 * Normalized Compression Distance — information-theoretic similarity.
 *
 *   NCD(x, y) = (C(xy) - min(C(x), C(y))) / max(C(x), C(y))
 *
 * Range: [0, 1+ε] where 0 = identical information content.
 * Deterministic. No model dependency. Approximates the universal distance metric.
 *
 * Reference: Li, Chen, Li, Ma, Vitányi (2004) "The Similarity Metric"
 */
export declare function ncd(a: string, b: string): number;
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