import { ImmutableArray } from "@tsplus/stdlib/collections/ImmutableArray/definition";
/**
 * Extends calls f with all the progressive slices up to the current element's
 * index, and uses the return value to construct the result array (i.e: like
 * `map` that also consumes all the elements up to `i`).
 * @tsplus static ImmutableArray.Aspects extend
 * @tsplus pipeable ImmutableArray extend
 * @tsplus location "@tsplus/stdlib/collections/ImmutableArray/extend"
 */
export declare function extend<A, B>(f: (fa: ImmutableArray<A>) => B): (self: ImmutableArray<A>) => ImmutableArray<B>;
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