import type { HighLowClose } from '../../base/Candle.type.js';
import { TrendIndicator } from '../../base/Indicator.js';
export type VortexResult = {
    minus: number;
    plus: number;
};
export declare class VortexIndicator extends TrendIndicator<VortexResult, HighLowClose<number>> {
    #private;
    readonly interval: number;
    constructor(interval?: number);
    getRequiredInputs(): number;
    update(candle: HighLowClose<number>, replace: boolean): VortexResult | null;
    protected calculateSignalState(result?: VortexResult | null | undefined): "BEARISH" | "BULLISH" | "SIDEWAYS" | "UNKNOWN";
}