export declare class AdvancedIterator<T> {
    private readonly iterator;
    private readonly buffer;
    private bufferIndex;
    private isDone;
    private nextCount;
    constructor(iterator: IterableIterator<T>);
    readonly done: boolean;
    readonly current: T;
    readonly previous: T;
    readonly peek: T;
    next(): T;
    rest(): IterableIterator<T>;
    private advance();
    private getNextBufferIndex();
}