import { ZeroCrossSeries } from '../../base/Indicator.js';
export type PVOConfig = {
    fastPeriod?: number;
    slowPeriod?: number;
};
export declare class PVO extends ZeroCrossSeries {
    #private;
    readonly fastPeriod: number;
    readonly slowPeriod: number;
    constructor({ fastPeriod, slowPeriod }?: PVOConfig);
    getRequiredInputs(): number;
    update(volume: number, replace: boolean): number | null;
}