import type { CSSResultGroup } from 'lit';
import SynergyElement from '../../internal/synergy-element.js';
import SynIcon from '../icon/icon.js';
import type SynSideNav from '../side-nav/side-nav.component.js';
/**
 * @summary The <syn-header /> element provides a generic application header
 * that can be used to add applications name, toolbar and primary navigation.
 *
 * @documentation https://synergy-design-system.github.io/?path=/docs/components-syn-header--docs
 * @status stable
 * @since 1.10.0
 *
 * @slot label - The label for the header
 * @slot logo - The logo that should be displayed. Will fall back to the SICK logo if not provided
 * @slot meta-navigation - The meta-navigation is used to add various application toolbar icons
 *                     Best used with `<syn-icon-button />` and `<syn-drop-down />`
 * @slot navigation - This slot can be used to add an optional horizontal navigation
 * @slot open-burger-menu-icon - An icon to use in lieu of the default burger-menu=open state.
 *                      The default close icon is a 'x'.
 * @slot closed-burger-menu-icon - An icon to use in lieu of the default burger-menu=closed state.
 *                      The default open icon is a burger menu.
 *
 * @event syn-burger-menu-closed - Emitted when the burger menu is toggled to closed
 * @event syn-burger-menu-hidden - Emitted when the burger menu is toggled to hidden
 * @event syn-burger-menu-open - Emitted when the burger menu is toggled to open
 *
 * @csspart base - The component's base wrapper
 * @csspart content - The wrapper most content items reside
 * @csspart logo - The wrapper the application logo resides in
 * @csspart label - The element wrapping the application name
 * @csspart meta-navigation - The Item wrapping the optional application menu
 * @csspart navigation - The wrapper that is holding the optional top navigation section
 * @csspart burger-menu-toggle-button - The button that toggles the burger menu
 */
export default class SynHeader extends SynergyElement {
    static styles: CSSResultGroup;
    static dependencies: {
        'syn-icon': typeof SynIcon;
    };
    private readonly hasSlotController;
    private readonly localize;
    /**
     * Internal mutation observer
     */
    private mutationObserver;
    private isSideNavAnimating;
    /**
     * The headers label. If you need to display HTML, use the `label` slot instead.
     */
    label: string;
    /**
     * Defines the current visibility and icon of the burger-menu icon.
     * The menu button is added automatically if the component finds a syn-side-nav in
     * variant="default".
     * The following values can be used:
     * - hidden: The burger menu is not visible
     * - open: The burger menu is visible and shows the close icon
     * - closed: The burger menu is visible and shows the open icon
     */
    burgerMenu: 'hidden' | 'open' | 'closed';
    /**
     * The side nav
     */
    private sideNav;
    private toggleBurgerMenu;
    private handleBurgerMenuToggle;
    /**
     * Automatically update the burger menu icon based
     * on the state of the side-nav, if one is connected.
     */
    private updateBurgerMenuBasedOnSideNav;
    handleBurgerMenu(): void;
    connectedCallback(): void;
    firstUpdated(): void;
    disconnectedCallback(): void;
    /**
     * Connect a `syn-side-nav` to add automatic interaction of the header with the side navigation
     * like showing the burger menu icon and open / close handling.
     *
     * If no side navigation is connected, the header will use the first `syn-side-nav` element it
     * finds.
     *
     * @param sideNav The side navigation to connect to the header
     */
    connectSideNavigation(sideNav: SynSideNav | null): void;
    render(): import("lit").TemplateResult;
}