import type { HighLow } from '../../base/Candle.type.js';
import { TechnicalIndicator } from '../../base/Indicator.js';
export type DonchianChannelsResult = {
    lower: number;
    middle: number;
    upper: number;
};
export declare class DonchianChannels extends TechnicalIndicator<DonchianChannelsResult, HighLow<number>> {
    #private;
    readonly interval: number;
    constructor(interval?: number);
    getRequiredInputs(): number;
    update(candle: HighLow<number>, replace: boolean): {
        lower: number;
        middle: number;
        upper: number;
    } | null;
}