import { Triple } from "./triple";
export declare const UNDEF: unique symbol;
export declare function duplicateLast<V, E>(solution: Solution<V, E>): Solution<V, E>;
export declare function sameValueZero(x: any, y: any): boolean;
export declare function unpackArg<T = any>(args: T[]): T | typeof UNDEF;
export declare function unpackArgs<T>(length: number, args: T[]): (T | typeof UNDEF)[];
export interface Solution<V, E> {
    readonly results: ReadonlyArray<SolutionStep<V, E>>;
    readonly collected: Record<string | number | symbol, unknown>;
}
export interface SolutionStep<V, E> {
    readonly triple?: Triple<V, E>;
    readonly value: V | E;
}
export declare function from<T>(x: Iterable<T>): Iterable<T>;
export declare function asyncfrom<T>(x: Iterable<T>): AsyncIterable<T>;
export declare function lastOrError<T>(arr: ReadonlyArray<T>): T;
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