export declare class PostCollapsibleTrigger {
    private trigger?;
    private observer;
    private root?;
    host: HTMLPostCollapsibleTriggerElement;
    /**
     * Link the trigger to a post-collapsible with this id
     */
    for: string;
    /**
     * Set the "aria-controls" and "aria-expanded" attributes on the trigger to match the state of the controlled post-collapsible
     */
    setAriaAttributes(): void;
    /**
     * Initiate a mutation observer that updates the trigger whenever necessary
     */
    connectedCallback(): void;
    /**
     * Attach a "postToggle" event listener to the root node
     * to update the trigger's "aria-expanded" attribute whenever the controlled post-collapsible is toggled
     */
    componentWillLoad(): void;
    /**
     * Add the "data-version" to the host element and set the trigger
     */
    componentDidLoad(): void;
    /**
     * Disconnect the mutation observer
     */
    disconnectedCallback(): void;
    /**
     * Update the "aria-controls" and "aria-expanded" attributes on the trigger button
     */
    update(): Promise<void>;
    private debouncedUpdate;
    /**
     * Toggle the post-collapsible controlled by the trigger
     */
    private toggleCollapsible;
    /**
     * Retrieve the post-collapsible controlled by the trigger
     */
    private get collapsible();
    /**
     * Find the button and add the proper event listener and ARIA attributes to it
     */
    private setTrigger;
}