/**
 * Compare two arrays.
 * @param a - Array to compare.
 * @param b - Array to compare.
 * @param from - Index to start compare from.
 * @returns Equals or not.
 */
export declare function compareArrays(a: unknown[], b: unknown[], from?: number): boolean;
/**
 * Clone simple object.
 * @param value
 * @returns Object clone.
 */
export declare function clone<T>(value: T): T;
/**
 * Concat arrays.
 * @param items
 * @returns Concatinated arrays.
 */
export declare function concat<T>(items: (T | T[])[]): T[];
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