type NestedPaths<T, Depth extends any[] = []> = T extends object ? Depth['length'] extends 3 ? never : {
    [K in keyof T]: K extends string ? T[K] extends any[] ? `${K}` : `${K}` | `${K}:${NestedPaths<T[K], [...Depth, any]>}` : never;
}[keyof T] : never;
type NestedValue<T, P extends string> = P extends `${infer K}:${infer Rest}` ? K extends keyof T ? NestedValue<T[K], Rest> : never : P extends keyof T ? T[P] : never;
/**
 * Utility class for array operations.
 * This class cannot be instantiated.
 */
export declare class ArrayUtils {
    private constructor();
    /**
     * Get unique objects by nested keys with full type safety
     * @example
     * const data = [
     *   {
     *     category: 'Tech',
     *     url: '/tech',
     *     data: { pathnames: { cat: 'alpha', sub: 'beta' } }
     *   },
     *   {
     *     category: 'Health',
     *     url: '/health',
     *     data: { pathnames: { cat: 'gamma', sub: 'delta' } }
     *   },
     *   {
     *     category: 'Tech',
     *     url: '/tech',
     *     data: { pathnames: { cat: 'alpha', sub: 'epsilon' } }
     *   }
     * ];
     *
     * // Get unique items by nested category
     * const result = ArrayUtils.getUniqueByKey(
     *   data,
     *   'data:pathnames:cat', // Group by nested category
     *   'category',           // Include top-level category
     *   'url'                 // Include URL
     * );
     *
     * // Result type: Array<{ 'data:pathnames:cat': string, category: string, url: string }>
     * console.log(result);
     * // Output:
     * // [
     * //   {
     * //     'data:pathnames:cat': 'alpha',
     * //     category: 'Tech',
     * //     url: '/tech'
     * //   },
     * //   {
     * //     'data:pathnames:cat': 'gamma',
     * //     category: 'Health',
     * //     url: '/health'
     * //   }
     * // ]
     */
    static getUniqueByKey<T extends object, GK extends NestedPaths<T>, IK extends NestedPaths<T>[]>(array: T[], groupKey: GK, ...includeKeys: IK): Record<GK | IK[number], NestedValue<T, GK | IK[number]>>[];
    /**
     * Extracts unique values from an array of objects based on a specified key.
     *
     * @template T - The object type in the array.
     * @template K - The key in the object whose unique values should be extracted.
     * @param {T[]} array - The array of objects to process.
     * @param {K} key - The key whose unique values should be returned.
     * @returns {T[K][]} An array of unique values for the specified key.
     *
     * @example
     * const data = [
     *   { id: 1, category: 'Tech', url: 'https://example.com/tech' },
     *   { id: 2, category: 'Health', url: 'https://example.com/health' },
     *   { id: 3, category: 'Tech', url: 'https://example.com/tech' },
     *   { id: 4, category: 'Education', url: 'https://example.com/education' },
     * ];
     *
     * const uniqueCategories = getUniqueValues(data, 'category');
     * console.log(uniqueCategories);
     * // Output: ['Tech', 'Health', 'Education']
     */
    static getUniqueValues: <T, K extends keyof T>(array: T[], key: K) => T[K][];
}
export {};