export declare class ConcatIterator<T> implements Iterator<T> {
    iterables: Iterable<Iterable<T>>;
    iterator: Iterator<Iterable<T>>;
    curIterator: Iterator<T> | null;
    constructor(iterables: Iterable<Iterable<T>>);
    private moveToNextIterable();
    next(): IteratorResult<T>;
}