import { RedBlackTree } from "@tsplus/stdlib/collections/RedBlackTree/definition";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * Returns the first entry in the tree.
 * @tsplus getter RedBlackTree first
 * @tsplus location "@tsplus/stdlib/collections/RedBlackTree/first"
 */
export declare function first<K, V>(tree: RedBlackTree<K, V>): Maybe<readonly [K, V]>;
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