import type { NumberArray } from 'cheminfo-types';
export interface XCheckOptions {
    /**
     * Minimum length
     * @default 1
     */
    minLength?: number;
}
/**
 * Checks if the input is a non-empty array of numbers.
 * Only checks the first element.
 * @param input - Array to check.
 * @param options - Additional checks.
 */
export declare function xCheck(input?: NumberArray, options?: XCheckOptions): asserts input is NumberArray;
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