/**
 * Compares two directory paths and returns a value indicating their order.
 * @example
 * ```ts
 * import { dirComparator } from '@d-zero/shared/sort/dir';
 *
 * const dirs = [
 * 	['a', 'b', 'c'],
 * 	['a', 'b', 'd'],
 * 	['a', 'b', ''],
 * 	['a', 'b', 'index'],
 * 	['a', 'b', 'index', ''],
 * 	['a', 'b', 'index', 'c'],
 * 	['a', 'b', 'index', 'd'],
 * 	['a', 'b', 'index', '1'],
 * 	['a', 'b', 'index', '2'],
 * 	['a', 'b', 'index', '10'],
 * ];
 *
 * dirs.sort(dirComparator);
 * ```
 * @param d1 - The first directory path to compare.
 * @param d2 - The second directory path to compare.
 * @returns A value of 0 if the directory paths are equal, -1 if d1 should be sorted before d2, or 1 if d1 should be sorted after d2.
 */
export declare function dirComparator(d1: readonly string[], d2: readonly string[]): 0 | -1 | 1;