import { Portfolio, Transaction } from '../types';
export declare function getPortfolio(): Promise<Portfolio>;
export declare function savePortfolio(portfolio: Portfolio): Promise<void>;
/**
 * Calculate Time-Weighted Return (TWR) for an asset
 * TWR eliminates the distorting effects of cash inflows and outflows
 * and provides a more accurate measure of investment performance
 *
 * @param transactions Array of transactions for the asset
 * @param currentPrice Current price of the asset
 * @param currentDate Current date
 * @returns The time-weighted return as a decimal (e.g., 0.1 for 10%)
 */
export declare function calculateTWR(transactions: Transaction[], currentPrice: number, currentDate: Date): number;
export declare function updatePortfolio(): Promise<void>;