import { Tree } from "@tsplus/stdlib/collections/Tree/definition";
/**
 * Iterate over the Tree in breadth-first order, applying `f`
 * @tsplus static Tree.Aspects forEach
 * @tsplus pipeable Tree forEach
 * @tsplus location "@tsplus/stdlib/collections/Tree/forEach"
 */
export declare function forEach<A, U>(f: (a: A) => U): (self: Tree<A>) => void;
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