/**
 * Default.ts
 *
 * @package  vrkd/src/list
 * @author  Fernando Salazar
 */
export type Storage<V> = {
    [k: string]: V;
};
/**
 * List class adds a CRUD wrapper to an object.
 */
export declare class List<V> {
    /**
     * List storage
     */
    private _storage;
    /**
     * Unique identifier for appending keyless values.
     */
    private _count;
    /**
     * Class constructor
     */
    constructor($storage?: Storage<V>);
    /**
     * Assign a `$val` to a `$key`
     */
    set($key: string, $val: V): void;
    /**
     * Get a value by `$key`
     */
    get($key: string): V;
    /**
     * Does storage have `$key`
     */
    has($key: string): boolean;
    /**
     * Add value to storage with no key provided.
     * It will generate and return the key it was assigned to.
     *
     * @param  {V} $value to be added.
     * @return {int} The `$key` index of the value.
     */
    append($value: V): string;
    /**
     * Remove value by `$key`.
     *
     * @param  {string} $key
     * @return {void}
     */
    remove($key: string): void;
    /**
     * Get all keys from storage
     */
    keys(): string[];
    /**
     * Get storage in a json string.
     *
     * @return {string} JSON string
     */
    toJSON(): string;
}