import type { OpenHighLowCloseVolume } from '../../base/Candle.type.js';
import { TrendIndicatorSeries } from '../../base/Indicator.js';
export declare class OBV extends TrendIndicatorSeries<OpenHighLowCloseVolume<number>> {
    readonly candles: OpenHighLowCloseVolume<number>[];
    readonly interval: number;
    constructor(interval: number);
    getRequiredInputs(): number;
    update(candle: OpenHighLowCloseVolume<number>, replace: boolean): number | null;
    protected calculateSignalState(result: number | null | undefined): "BEARISH" | "BULLISH" | "SIDEWAYS" | "UNKNOWN";
}