/**
 * Calculate confidence score based on date proximity
 *
 * Client-Aware Logic:
 * - Client same-business matches: Always return 1.0
 *   This allows amount/currency matching to be primary ranking factors for recurring charges from clients
 * - Non-client or cross-business matches: Apply linear degradation (1.0 same-day to 0.0 at 30+ days)
 *
 * @param date1 - First date
 * @param date2 - Second date
 * @param isClientMatch - Whether transaction business matches document business AND is a registered CLIENT (default: false)
 * @returns Confidence score from 0.0 (30+ days) to 1.0 (same day for non-client, always for client)
 */
export declare function calculateDateConfidence(date1: Date, date2: Date, isGentleEligible?: boolean): number;