/**
 * Finds all duplicates.
 *
 * @category Array
 * @category Package : @augment-vir/common
 * @example
 *
 * ```ts
 * import {extractDuplicates} from '@augment-vir/common';
 *
 * const result = extractDuplicates([
 *     'a',
 *     'b',
 *     '',
 *     'a',
 * ]);
 * // result is `{duplicates: ['a'], uniques: ['b', '']}`
 * ```
 *
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export declare function extractDuplicates<T>(items: ReadonlyArray<T>, comparator?: (a: T, b: T) => boolean): {
    duplicates: T[];
    uniques: T[];
};