export declare function opFlattenAsync<T>(): (iter: AsyncIterable<AsyncIterable<T> | Iterable<T>>) => AsyncIterable<T>;
export declare function opFlattenSync<T>(): (iter: Iterable<Iterable<T>>) => Iterable<T>;
export declare const opFlatten: <T>() => import("../internalTypes").PipeFn<Iterable<T>, T>;
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