import type { NumberArray } from 'cheminfo-types';
/**
 * Returns true if x is monotonic.
 * @param array - array of numbers.
 * @returns 1 if monotonic increasing, -1 if monotonic decreasing, 0 if not monotonic.
 */
export declare function xIsMonotonic(array: NumberArray): -1 | 0 | 1;
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