import { Equivalence } from "@tsplus/stdlib/prelude/Equivalence/definition";
import { Tree } from "@tsplus/stdlib/collections/Tree/definition";
/**
 * Test if a value is a member of a `Tree`. Takes a `Equivalence<A>` and a
 * value of `A` and returns a `boolean` if the `value` is contained in `Tree`
 * @tsplus static Tree.Aspects elem
 * @tsplus pipeable Tree elem
 * @tsplus location "@tsplus/stdlib/collections/Tree/elem"
 */
export declare function elem<A>(E: Equivalence<A>, value: A): (self: Tree<A>) => boolean;
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