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