import type { NumberArray } from 'cheminfo-types';
export interface XGetTargetIndexOptions {
    target?: number;
    /**
     * @default 0
     */
    targetIndex?: number;
}
/**
 *  Returns the targetIndex
 * @param x - array of numbers
 * @param options - options
 */
export declare function xGetTargetIndex(x: NumberArray, options?: XGetTargetIndexOptions): number;
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