export declare type NextReturn<T> = {
    done?: boolean;
    value: T;
};
export declare function next_async<T>(iter: AsyncIterable<T>): Promise<NextReturn<T>>;
export declare function next_sync<T>(iter: Iterable<T>): NextReturn<T>;
export declare function next<T>(iter: Iterable<T> | AsyncIterable<T>): Promise<NextReturn<T>>;
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