import { Equivalence } from "@tsplus/stdlib/prelude/Equivalence/definition";
import { Chunk } from "@tsplus/stdlib/collections/Chunk/definition";
/**
 * Creates an array of unique values, in order, from all given arrays using an
 * `Equivalence<A>` for equality comparisons.
 * @tsplus static Chunk.Aspects union
 * @tsplus pipeable Chunk union
 * @tsplus location "@tsplus/stdlib/collections/Chunk/operations/union"
 */
export declare function union<A>(E: Equivalence<A>, that: Chunk<A>): (self: Chunk<A>) => Chunk<A>;
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