import type { NumberArray } from 'cheminfo-types';
export interface XBinningOptions {
    /**
     * Number of consecutive points to average per bin. Must be a positive integer.
     * Ignored when `numberOfPoints` is provided.
     * @default 10
     */
    binSize?: number;
    /**
     * Target number of points in the output. When provided, the input is split
     * into `numberOfPoints` contiguous bins of as-equal-as-possible size, and
     * takes precedence over `binSize`. Must be a positive integer and
     * `<= array.length`.
     */
    numberOfPoints?: number;
    /**
     * If `true`, the first and last points of the input are preserved unchanged
     * in the output (useful to keep the exact domain endpoints of a spectrum).
     * The intermediate points (indices `1` to `length - 2`) are binned.
     * @default true
     */
    keepFirstAndLast?: boolean;
}
/**
 * Downsample an array by averaging consecutive non-overlapping points (binning).
 * Either specify a fixed `binSize` or a target `numberOfPoints`.
 * @param array - Input array.
 * @param options - Options.
 * @returns Downsampled array.
 */
export declare function xBinning(array: NumberArray, options?: XBinningOptions): Float64Array<ArrayBuffer>;
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