/**
 * Directional Indicators (DI+ and DI-).
 * @param high High price series
 * @param low Low price series
 * @param close Close price series
 * @param period Lookback period (must be > 0)
 * @returns Tuple `[diplus, diminus]` as Float64Array
 */
export declare function di(high: ArrayLike<number>, low: ArrayLike<number>, close: ArrayLike<number>, period: number): [Float64Array, Float64Array];
/**
 * DX (Directional Movement Index).
 * @param high High price series
 * @param low Low price series
 * @param close Close price series
 * @param period Lookback period (must be > 0)
 * @returns Float64Array of DX values (NaN where undefined)
 */
export declare function dx(high: ArrayLike<number>, low: ArrayLike<number>, close: ArrayLike<number>, period: number): Float64Array;
/**
 * Average Directional Index (ADX).
 * @param high High price series
 * @param low Low price series
 * @param close Close price series
 * @param period Lookback period (must be > 0)
 * @returns Float64Array of ADX values (NaN where undefined)
 */
export declare function adx(high: ArrayLike<number>, low: ArrayLike<number>, close: ArrayLike<number>, period: number): Float64Array;
/**
 * ADXR (Average DX Rating) - smoothed ADX.
 * @param high High price series
 * @param low Low price series
 * @param close Close price series
 * @param period Lookback period (must be > 0)
 * @returns Float64Array of ADXR values (NaN where undefined)
 */
export declare function adxr(high: ArrayLike<number>, low: ArrayLike<number>, close: ArrayLike<number>, period: number): Float64Array;