/**
 * @public
 * @class utils
 */
/**
 * Given an array and an index, splits the array at index and pushes the first
 * chunk to the end of the second chunk.
 *
 * @private
 * @method arraySwap
 * @param {Array} arr An array to split, shift and rejoin.
 * @param {number} index The index where the split should occur.
 * @return {Array} The swapped/shifted array.
 */
export declare function arraySwap<T>(arr: T[], index: number): T[];
export declare function unique<T>(arr: T[]): T[];
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