import type { NumberArray } from 'cheminfo-types';
import type { XGetFromToIndexOptions } from './xGetFromToIndex.ts';
/**
 * Calculate the sum of the values
 * @param array - Object that contains property x (an ordered increasing array) and y (an array).
 * @param options - Options.
 * @returns XSum value on the specified range.
 */
export declare function xSum(array: NumberArray, options?: XGetFromToIndexOptions): number;
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