/**
 * A generic, abstract class for managing an array-like collection of items.
 * @template T The type of elements stored in the list.
 */
export declare abstract class List<T = unknown> {
    protected inner: T[];
    /**
     * Constructor for the List class.
     * @param inner The internal array that stores the elements.
     * @throws Error if the provided array is not
     */
    constructor(inner: T[]);
    [Symbol.iterator](): Iterable<T>;
    get length(): number;
    /**
     * Provides direct access to the internal array of items.
     * @returns A reference to the internal array of items.
     */
    asArray(): T[];
    /**
     * Returns a copy of the internal array of items.
     * This ensures the internal array remains immutable when accessed via this method.
     * @returns A new array containing the elements of the internal array.
     */
    all(): T[];
}
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