export interface SingleImmutableLinkedListNode<T> {
    elem: T;
    previous: SingleImmutableLinkedListNode<T> | undefined;
}
export declare class SingleImmutableLinkedList<T> implements Iterable<T> {
    readonly last: SingleImmutableLinkedListNode<T>;
    readonly length: number;
    constructor(last: SingleImmutableLinkedListNode<T>, length: number);
    concat(elem: T): SingleImmutableLinkedList<T>;
    [Symbol.iterator](): Iterator<T>;
}
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