import { Equivalence } from "@tsplus/stdlib/prelude/Equivalence/definition";
import { ImmutableArray } from "@tsplus/stdlib/collections/ImmutableArray/definition";
/**
 * Test if a value is a member of an array. Takes a `Equivalence<A>` as a single
 * argument which returns the function to use to search for a value of type `A`
 * in an `ImmutableArray<A>`.
 * @tsplus static ImmutableArray.Aspects elem
 * @tsplus pipeable ImmutableArray elem
 * @tsplus location "@tsplus/stdlib/collections/ImmutableArray/elem"
 */
export declare function elem<A>(E: Equivalence<A>, a: A): (self: ImmutableArray<A>) => boolean;
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