/**
 * Net Present Value (NPV) compares the money received in the future to an amount of money received today, while accounting for time and interest [through the discount rate]. It's based on the principal of time value of money (TVM), which explains how time affects monetary value.
 *
 * @see https://www.investopedia.com/articles/fundamental-analysis/09/net-present-value.asp
 * @param rate
 * @param initial
 * @param cashFlows
 * @returns
 */
export declare function NPV(rate: number, cashFlows: number[]): number;