/**
 * Utilities for measuring fingerprint entropy and uniqueness
 */
export interface FingerprintCharacteristics {
    battery?: string;
    screen?: string;
    canvas?: string;
    webglParams?: string;
    audio?: string;
    userAgent?: string;
    [key: string]: string | undefined;
}
/**
 * Calculate Shannon entropy of a string
 * Higher values indicate more randomness/uniqueness
 */
export declare function calculateStringEntropy(str: string): number;
/**
 * Estimate bit entropy of a fingerprint
 * @param fingerprint The fingerprint string
 * @param characteristics The collected fingerprint characteristics
 * @returns Estimated bits of entropy
 */
export declare function estimateFingerprintEntropy(fingerprint: string, characteristics: Partial<FingerprintCharacteristics>): number;
/**
 * Get a qualitative assessment of fingerprint strength
 */
export declare function getFingerprintQuality(entropyBits: number): {
    rating: "weak" | "moderate" | "strong" | "very strong";
    description: string;
};