import { OBV as OBVIndicator } from 'technicalindicators';
import { OHLC } from '../types';
import { IndicatorInput, Indicator } from './base-indicator';
export declare type OnBalanceVolumeInput = IndicatorInput;
/**
 * On-balance volume (OBV) is a technical trading momentum indicator that
 * uses volume flow to predict changes in stock price. Joseph Granville
 * first developed the OBV metric in the 1963 book Granville's New Key to
 * Stock Market Profits. Granville believed that volume was the key force
 * behind markets and designed OBV to project when major moves in the markets
 * would occur based on volume changes. In his book, he described the
 * predictions generated by OBV as "a spring being wound tightly." He believed
 * that when volume increases sharply without a significant change in the
 * stock's price, the price will eventually jump upward or fall downward.
 */
export declare class OBV implements Indicator {
    indicator: OBVIndicator;
    /**
     * @param {OHLC[]} series candles series
     */
    constructor(series: OHLC[]);
    /**
     * Retrieve OBV values for instance
     * @return {number[]} values for instance data
     */
    getResults(): number[];
    /**
     * Calculate OBV to next tick
     * @param {OHLC} candle new candle to add to series
     * @return {number | undefined} next OBV value or undefined if period is
     * greater than actual series length
     */
    next(candle: OHLC): number | undefined;
    /**
     * Create instance from data
     * @param {OnBalanceVolumeInput} input input data
     * @return {OBV} OBV instance
     */
    static generator({ series }: OnBalanceVolumeInput): OBV;
    /**
     * Get OBV values from input
     * @param {OnBalanceVolumeInput} input input data
     * @return {number[]} OBV values
     */
    static calculate({ series, }: OnBalanceVolumeInput): number[];
}