/**
 * Convert a synchronous iterator into an asynchronous one.
 */
export declare const asyncIteratorFrom: <TYield, TReturn, TNext>(iterator: Iterator<TYield, TReturn, TNext>) => AsyncIterator<TYield, TReturn, TNext>;
/**
 * If the value is already an Iterator, return it.
 * If the value is Iterable, return an Iterator for it.
 * Otherwise, throw an error.
 */
export declare const iteratorOf: <T>(it: Iterable<T, undefined, undefined> | Iterator<T, undefined, undefined>) => Iterator<T, undefined, undefined>;
/**
 * If the value is already an Iterator, return it.
 * If the value is AsyncIterable, return an Iterator for it.
 * It the value is Iterable, upgrade an Iterator for it to an AsyncIterator
 * and return that.
 * Otherwise, throw an error.
 * @remarks
 * As the only difference between an Iterator and an AsyncIterator
 * is the return type of the `next` function, this function cannot
 * distinguish whether a given Iterator is an AsyncIterator or not.
 * If your calling code does not use `await` and instead uses `then`
 * directly, you may end up with errors.
 */
export declare const asyncIteratorOf: <T>(it: AsyncIterable<T, undefined, undefined> | Iterable<T, undefined, undefined> | AsyncIterator<T, undefined, undefined>) => AsyncIterator<T, undefined, undefined>;
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