/** Manages opening/closing of project code box panel. */
declare class PanelToggle {
    /** Panel element. */
    private panelElement;
    /** Open/Close button. */
    private buttonElement;
    /** Panel content container element. */
    private panelContentContainerElement;
    /** Function that is called when panel is opened/closed. */
    private onToggle;
    /** Indicates whether panel is currently opened. */
    private opened;
    /** Text for button aria-label attribute when panel is closed. */
    private readonly openPanelAriaLabel;
    /** Text for button aria-label attribute when panel is opened. */
    private readonly closePanelAriaLabel;
    /**
     * Creates new panel toggle.
     * @param panelElement Panel element.
     * @param buttonElement Open/close button.
     * @param panelContentContainerElement Panel content container element.
     * @param openPanelAriaLabel Text for open/close button aria-label attribute when panel is closed.
     * @param closePanelAriaLabel Text for open/close button aria-label attribute when panel is opened.
     * @param onToggle Function to be called when panel is opened/closed.
     */
    constructor(panelElement: HTMLElement, buttonElement: HTMLButtonElement, panelContentContainerElement: HTMLElement, openPanelAriaLabel: string, closePanelAriaLabel: string, onToggle: () => void);
    /**
     * Opens panel.
     */
    open(): void;
    /**
     * Closes panel.
     */
    close(): void;
    /**
     * Checks whether panel is opened.
     * @returns Indicates whether panel is opened.
     */
    isOpened(): boolean;
    /**
     * Called when button is clicked.
     */
    private onButtonClick;
}
export default PanelToggle;