import { BollingerBands as BBIndicator } from 'technicalindicators';
import { OHLC, OHLCEnum } from '../types';
import { IndicatorInput, Indicator } from './base-indicator';
export interface BollingerBandsInput extends IndicatorInput {
    period?: number;
    source?: OHLCEnum;
    stdDev?: number;
}
export interface BollingerBandsOutput {
    middle: number;
    upper: number;
    lower: number;
}
/**
 * Bollinger Bands® are a type of chart indicator for technical analysis
 * and have become widely used by traders in many markets, including stocks,
 * futures, and currencies. Created by John Bollinger in the 1980s, the bands
 * offer unique insights into price and volatility. In fact, there are a
 * number of uses for Bollinger Bands®, such as determining overbought and
 * oversold levels, as a trend following tool, and for monitoring for breakouts.
 */
export declare class BB implements Indicator {
    indicator: BBIndicator;
    source: OHLCEnum;
    /**
     * @param {OHLC[]} series candles series
     * @param {OHLCEnum} source candles price source
     * @param {number} period period length
     * @param {number} stdDev standard deviation
     */
    constructor(series?: OHLC[], source?: OHLCEnum, period?: number, stdDev?: number);
    /**
     * Retrieve BB values for instance
     * @return {BollingerBandsOutput[]} values for instance data
     */
    getResults(): BollingerBandsOutput[];
    /**
     * Calculate BB to next tick
     * @param {OHLC} candle new candle to add to series
     * @return {BollingerBandsOutput | undefined} next BB value or undefined if
     * period is greater than actual series length
     */
    next(candle: OHLC): BollingerBandsOutput | undefined;
    /**
     * Create instance from data
     * @param {BollingerBandsInput} input input data
     * @return {BB} BB instance
     */
    static generator({ series, period, stdDev, source, }: BollingerBandsInput): BB;
    /**
     * Get BB values from input
     * @param {BollingerBandsInput} input input data
     * @return {BollingerBandsOutput[]} BB values
     */
    static calculate(input: BollingerBandsInput): BollingerBandsOutput[];
}