import type { Comparator } from "@thi.ng/api";
/**
 * Syntax sugar for `Object.keys(x).sort()` with support for custom comparator
 * (default:
 * [`compare()`](https://docs.thi.ng/umbrella/compare/functions/compare.html))
 * and yielding iterator of sorted keys.
 *
 * @param x -
 * @param cmp -
 */
export declare function sortedKeys(x: any, cmp?: Comparator<string>): Generator<string, void, undefined>;
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