/**
 * A simple key-value storage class using Map.
 */
export declare class State {
    private state;
    constructor();
    /**
     * Store a value with a specific key.
     * @param key - The key for the value.
     * @param value - The value to be stored.
     */
    set(key: string, value: any): void;
    /**
     * Retrieve a value by key.
     * @param key - The key of the value to retrieve.
     * @returns The stored value or undefined if not found.
     */
    get(key: string): any | undefined;
    /**
     * Delete a key from storage.
     * @param key - The key to remove.
     * @returns True if the key was deleted, false otherwise.
     */
    delete(key: string): boolean;
    /**
     * Check if a key exists in the storage.
     * @param key - The key to check.
     * @returns True if the key exists, false otherwise.
     */
    has(key: string): boolean;
    /**
     * Get an array of all stored keys.
     * @returns An array of keys.
     */
    keys(): string[];
    /**
     * Get an array of all stored values.
     * @returns An array of values.
     */
    values(): any[];
    /**
     * Get an array of all key-value pairs.
     * @returns An array of [key, value] tuples.
     */
    entries(): [string, any][];
    /**
     * Remove all entries from storage.
     */
    clear(): void;
}