import { RedBlackTree } from "@tsplus/stdlib/collections/RedBlackTree/definition";
import type { Direction } from "@tsplus/stdlib/collections/RedBlackTree/definition";
/**
 * Get the keys of the tree.
 * @tsplus static RedBlackTree.Aspects keys
 * @tsplus pipeable RedBlackTree keys
 * @tsplus location "@tsplus/stdlib/collections/RedBlackTree/keys"
 */
export declare function keys(direction?: Direction): <K, V>(self: import("@tsplus/stdlib/collections/RedBlackTree/definition").RedBlackTree<K, V>) => IterableIterator<K>;
//# sourceMappingURL=keys.d.ts.map