/**
 * Configuration for the focus trap helper
 */
export interface FocusTrapConfig {
    /** Element that focus is trapped within */
    trapElement: HTMLElement;
}
/**
 * Focus trap helper for BootstrapSheet.
 *
 * Keeps keyboard focus inside the trap element while it is active: cycles
 * Tab/Shift+Tab between the first and last focusable descendants, tracks
 * DOM changes that affect focusability via a MutationObserver, and restores
 * focus to the previously focused element when the sheet closes.
 */
export default class FocusTrap {
    #private;
    constructor(config: FocusTrapConfig);
    /**
     * Remember the currently focused element so it can be restored later
     */
    capture(): void;
    /**
     * Start trapping focus: track focusable elements and cycle Tab keys
     */
    activate(): void;
    /**
     * Stop trapping focus: detach the keydown handler and the observer
     */
    deactivate(): void;
    /**
     * Focus the first focusable element, or the trap element itself
     */
    focusInitial(): void;
    /**
     * Restore focus to the element that was focused before activation
     */
    restore(): void;
}
/**
 * Inert manager for BootstrapSheet.
 *
 * Hides everything outside the sheet from assistive technology while the
 * sheet is open. Uses the native `inert` attribute when supported, falling
 * back to `aria-hidden` otherwise, and restores the previous state on remove.
 * @see {@link https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/inert}
 */
export declare class InertManager {
    #private;
    /**
     * Apply inert (or aria-hidden) to everything outside the given elements.
     *
     * Walks from each excluded element up to `<body>`, hiding its siblings at
     * every level. Hiding only the children of `<body>` would be enough for a
     * sheet authored as a direct child of `<body>`, but not for one nested in an
     * app root or a wrapper component: there the wrapper itself would be hidden,
     * and since `inert` is inherited, the sheet would go inert along with it.
     * @param excluded - Elements to leave interactive (e.g. sheet and backdrop)
     */
    apply(excluded: readonly (Element | null | undefined)[]): void;
    /**
     * Restore the previous accessibility state of all hidden nodes
     */
    remove(): void;
}
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