/**
 * Calculate confidence score based on currency match
 * @param transactionCurrency - Currency code from transaction
 * @param documentCurrency - Currency code from document
 * @returns 1.0 if same, 0.2 if one/both missing, 0.0 if different
 */
export declare function calculateCurrencyConfidence(transactionCurrency: string | null | undefined, documentCurrency: string | null | undefined): number;