import IHTMLCollection from '../element/IHTMLCollection';
import HTMLOptionElement from '../html-option-element/HTMLOptionElement';
import IHTMLOptionElement from '../html-option-element/IHTMLOptionsElement';
/**
 * HTML Options Collection
 *
 * Reference:
 * https://developer.mozilla.org/en-US/docs/Web/API/HTMLOptionsCollection
 */
export default interface IHTMLOptionsCollection extends IHTMLCollection<HTMLOptionElement> {
    readonly selectedIndex: number;
    length: number;
    /**
     * Adds new option to collection.
     *
     * @param element HTMLOptionElement to add TODO: also OPTGroup must supported.
     * @param before HTMLOptionElement or index number.
     */
    add(element: HTMLOptionElement, before?: number | IHTMLOptionElement): void;
    /**
     * Removes option element from the collection.
     *
     * @param index number.
     */
    remove(index: number): void;
}