import type { NpvInput, NpvResult } from './types.js';
/**
 * Calculate net present value (NPV), IRR, and profitability index
 *
 * @param input - Initial investment, cash flow series, and discount rate
 * @returns NPV result (irr is null when the IRR iteration does not converge)
 * @throws RangeError if initialInvestment is negative, cashFlows is empty,
 *   or discountRate is outside [0, 1)
 */
export declare function npv(input: NpvInput): NpvResult;
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