/**
 * Controller for managing the selected items.
 *
 * @private
 * @class SelectedItemsController
 */
export declare class SelectedItemsController {
    /**
     * The set holding the currently selected item values.
     */
    selectedItems: Set<unknown>;
    /**
     * The maximum number of items that can be selected simultaneously.
     */
    maxSelectionsCount: number;
    /**
     * Creates a new SelectedItemsController.
     *
     * @param {Array<*>|undefined} selectedItems Array of selected items.
     */
    constructor(selectedItems?: unknown[]);
    /**
     * Sets the maximum number of selections.
     */
    setMaxSelectionCount(maxSelectionsCount: number): void;
    /**
     * Adds selected values (single or array) to the set.
     *
     * @param {string|object|Array<string|object>} items Items to add.
     */
    add(items: unknown | unknown[]): void;
    /**
     * Removes a selected value from the set.
     *
     * @param {string|object} item Item to remove.
     * @returns {boolean} True if the item was removed, false otherwise.
     */
    remove(item: unknown): boolean;
    /**
     * Checks if a value is in the set.
     *
     * @param {*} value Value to check.
     * @returns {boolean}
     */
    has(value: unknown): boolean;
    /**
     * Clears the set.
     */
    clear(): void;
    /**
     * Gets the number of selected items.
     *
     * @returns {number}
     */
    getSize(): number;
    /**
     * Gets the elements of the set.
     *
     * @returns {Array<*>}
     */
    getItemsArray(): unknown[];
}