/**
 * The spacing of an x axis over a window, which every derivative divides by.
 */
import type { NumberArray } from 'cheminfo-types';
/**
 * The mean spacing of `h` over the window centred on `center`.
 *
 * The sum of consecutive differences telescopes, so only the two ends of the
 * window are read instead of every point.
 * @param h - The x values.
 * @param center - Index the window is centred on.
 * @param half - Half the window size.
 * @returns The mean spacing.
 */
export declare function meanGap(h: NumberArray, center: number, half: number): number;
/**
 * A spacing raised to a derivative order.
 *
 * Orders 1 and 2 are spelled out because `x ** 1` is far slower than `x`.
 * @param spacing - The mean spacing.
 * @param derivative - The order.
 * @returns The divisor for that order.
 */
export declare function raise(spacing: number, derivative: number): number;
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