/**
 * Trend Strength Index
 *
 * Measures trend strength using the Pearson correlation between
 * closing prices and bar indices over a rolling window.
 * Range: -1 to 1, where positive = uptrend, negative = downtrend.
 * Formula: correlation(close, bar_index, length)
 */
import { type IndicatorResult, type InputConfig, type PlotConfig, type HLineConfig, type Bar } from 'oakscriptjs';
export interface TrendStrengthInputs {
    /** Period length */
    length: number;
    /** Bullish fill color */
    bullishColor: string;
    /** Bearish fill color */
    bearishColor: string;
}
export declare const defaultInputs: TrendStrengthInputs;
export declare const inputConfig: InputConfig[];
export declare const plotConfig: PlotConfig[];
export declare const hlineConfig: HLineConfig[];
export declare const metadata: {
    title: string;
    shortTitle: string;
    overlay: boolean;
};
export declare function calculate(bars: Bar[], inputs?: Partial<TrendStrengthInputs>): IndicatorResult;
export declare const TrendStrengthIndex: {
    calculate: typeof calculate;
    metadata: {
        title: string;
        shortTitle: string;
        overlay: boolean;
    };
    defaultInputs: TrendStrengthInputs;
    inputConfig: InputConfig[];
    plotConfig: PlotConfig[];
    hlineConfig: HLineConfig[];
};
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