/**
 * HalfTrend
 *
 * ATR-based trend detection with amplitude-filtered state transitions.
 * Tracks highest lows / lowest highs over the amplitude period, flips direction
 * when SMA of high/low crosses these extremes and price confirms.
 *
 * Reference: TradingView "HalfTrend" by everget
 */
import { type IndicatorResult, type InputConfig, type PlotConfig, type Bar } from 'oakscriptjs';
import type { MarkerData } from '../types';
export interface HalfTrendInputs {
    amplitude: number;
    channelDeviation: number;
    showArrows: boolean;
    showLabels: boolean;
}
export declare const defaultInputs: HalfTrendInputs;
export declare const inputConfig: InputConfig[];
export declare const plotConfig: PlotConfig[];
export declare const metadata: {
    title: string;
    shortTitle: string;
    overlay: boolean;
};
export declare function calculate(bars: Bar[], inputs?: Partial<HalfTrendInputs>): IndicatorResult & {
    markers: MarkerData[];
};
export declare const HalfTrend: {
    calculate: typeof calculate;
    metadata: {
        title: string;
        shortTitle: string;
        overlay: boolean;
    };
    defaultInputs: HalfTrendInputs;
    inputConfig: InputConfig[];
    plotConfig: PlotConfig[];
};
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