/**
 * Two derivatives of one spectrum, in a single pass.
 */
import type { NumberArray } from 'cheminfo-types';
export interface SGGPairOptions {
    /**
     * @default 9
     */
    windowSize?: number;
    /**
     * The two derivative orders, in the order they are returned.
     * @default [1, 2]
     */
    derivatives?: [number, number];
    /**
     * @default 3
     */
    polynomial?: number;
}
/**
 * Apply the Savitzky Golay algorithm for two derivative orders at once.
 *
 * Each y value is read once and multiplied into both accumulators, and the
 * window spacing is measured once and raised twice, where calling `sgg` twice
 * repeats both. Peak picking wants the first and second derivative of the same
 * trace, which is what the default asks for.
 *
 * Two and not a list: an accumulator per order behind a loop costs more than
 * sharing the reads saves, so a general version measured slower than calling
 * `sgg` repeatedly. Ask for more than two by calling this and `sgg`.
 * @param ys - Array of y values.
 * @param xs - Array of X or deltaX.
 * @param options - Options controlling window size, derivatives and polynomial order.
 * @returns The two derivative arrays, in the order requested.
 */
export declare function sggPair(ys: NumberArray, xs: NumberArray | number, options?: SGGPairOptions): [Float64Array, Float64Array];
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