import type { FaceDescriptor, FaceMatchResult } from '../types';
/**
 * Compute Euclidean distance between two 128-dim face descriptors.
 */
export declare function compareFaces(d1: FaceDescriptor, d2: FaceDescriptor): number;
/**
 * Find the best match among candidates.
 * Returns null if no match is below the threshold.
 */
export declare function findMatch<T extends {
    faceDescriptor: number[];
}>(descriptor: FaceDescriptor, candidates: T[], threshold?: number): FaceMatchResult<T> | null;
/**
 * Find all matches below the threshold, sorted by distance.
 */
export declare function findAllMatches<T extends {
    faceDescriptor: number[];
}>(descriptor: FaceDescriptor, candidates: T[], threshold?: number): FaceMatchResult<T>[];
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