import type { NumberArray } from 'cheminfo-types';
export interface XFindClosestIndexOptions {
    /**
     * Is the array sorted ? This allows to make a dichotomic search that is much faster.
     * @default true
     */
    sorted?: boolean;
}
/**
 * Returns the closest index of a `target`
 * @param array - array of numbers
 * @param target - target
 * @param options
 * @returns - closest index
 */
export declare function xFindClosestIndex(array: NumberArray, target: number, options?: XFindClosestIndexOptions): number;
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