import type { DataXY, NumberArray } from 'cheminfo-types';
/**
 * Filters x,y values to allow strictly growing values in x-axis.
 * @param data - object that contains property x (an ordered increasing array) and y (an array).
 * @returns filtered data with strictly increasing x values.
 */
export declare function xyEnsureGrowingX<DataType extends NumberArray = NumberArray>(data: DataXY<DataType>): DataXY<DataType | number[]>;
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