import { LitElement } from 'lit';
/**
 * @element ui-focus-trap
 * @description Traps keyboard focus within the element
 * Essential for modals, drawers, and dialogs to maintain accessibility
 *
 * @slot - Content to trap focus within
 *
 * @fires focus-trapped - Fired when focus trap is activated
 * @fires focus-released - Fired when focus trap is deactivated
 *
 * @example
 * ```html
 * <ui-focus-trap active>
 *   <div role="dialog">
 *     <button>First focusable</button>
 *     <input type="text">
 *     <button>Last focusable</button>
 *   </div>
 * </ui-focus-trap>
 * ```
 */
export declare class UIFocusTrap extends LitElement {
    static styles: import("lit").CSSResult;
    /**
     * Whether the focus trap is active
     */
    active: boolean;
    /**
     * Whether to restore focus to the previously focused element when deactivated
     */
    restoreFocus: boolean;
    private _previouslyFocused;
    private _boundHandleKeyDown;
    private _observer;
    connectedCallback(): void;
    disconnectedCallback(): void;
    updated(changedProperties: Map<string, any>): void;
    private _activate;
    private _deactivate;
    private _handleKeyDown;
    private _getFocusableElements;
    private _focusFirstElement;
    render(): import("lit-html").TemplateResult<1>;
}
declare global {
    interface HTMLElementTagNameMap {
        'ui-focus-trap': UIFocusTrap;
    }
}
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