/**
 * Accumulation/Distribution (AD) line.
 * Computes the cumulative money flow: AD[i] = AD[i-1] + MFM[i] * volume[i],
 * where MFM = ((close - low) - (high - close)) / (high - low).
 * NaNs propagate for invalid input tuples and the accumulator only updates on finite values.
 * @param high High price series
 * @param low Low price series
 * @param close Close price series
 * @param volume Volume series
 * @returns Float64Array of AD values
 */
export declare function ad(high: ArrayLike<number>, low: ArrayLike<number>, close: ArrayLike<number>, volume: ArrayLike<number>): Float64Array;