/**
 * Returns an array of unique values from the given array.
 *
 * @param arr - The array to get unique values from.
 * @returns An array of unique values.
 */
export declare const getUnique: <T = any>(arr: T[]) => T[];
/**
 * Returns a new array containing only the unique elements from the original array,
 * based on the values returned by the mapper function.
 *
 * @example
 * ```ts
 * uniqBy([1.2, 1.5, 2.1, 3.2, 5.7, 5.3, 7.19], Math.floor);
 * // [1.2, 2.1, 3.2, 5.7, 7.19]
 * ```
 *
 * @param arr - The array to process.
 * @param mapper - The function used to convert the array elements.
 * @returns A new array containing only the unique elements from the original array, based on the values returned by the mapper function.
 */
export declare function getUniqueBy<T, U>(arr: readonly T[], mapper: (item: T) => U): T[];