export declare abstract class AbstractLinkedList<T, S extends {
    next?: S;
    item: T;
}> implements Iterable<T> {
    protected first?: S;
    protected localLength: number;
    get length(): number;
    [Symbol.iterator](): IterableIterator<T>;
    protected getHolderAtNotChecked(index: number): S | undefined;
    getItemAt(index: number): T | undefined;
    get empty(): boolean;
    contains(item: T): boolean;
    toArray(): T[];
}
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