import { TemplateResult, CSSResultArray, PropertyValues, nothing } from 'lit';
import NileElement from '../../internal/nile-element';
/**
 * Keyboard shortcut reference dialog, opened from the toolbar or Mod-/.
 * Emits `wysiwyg-shortcut-help-close` when dismissed (Esc, ✕ or backdrop).
 */
export declare class NileWysiwygShortcutHelp extends NileElement {
    open: boolean;
    private panelEl?;
    /** Body overflow value before we locked it; null = not locked by us. */
    private previousBodyOverflow;
    static get styles(): CSSResultArray;
    /**
     * Locks page scrolling while the dialog is open (the fixed backdrop blocks
     * clicks but not wheel/touch scrolling of the document behind it).
     * Save/restore keeps it composable with other locks (e.g. fullscreen).
     */
    protected updated(changed: PropertyValues): void;
    disconnectedCallback(): void;
    /** Moves focus into the dialog so Esc lands here. */
    focusPanel(): void;
    private close;
    private handleKeydown;
    render(): TemplateResult | typeof nothing;
}
declare global {
    interface HTMLElementTagNameMap {
        'nile-wysiwyg-shortcut-help': NileWysiwygShortcutHelp;
    }
}