import { LitElement, PropertyValues } from 'lit';
declare const ALLOWED_PLACEMENTS: readonly ["right", "left", "top", "bottom"];
export type DrawerPlacement = (typeof ALLOWED_PLACEMENTS)[number];
export declare class WebUiDrawer extends LitElement {
    static styles: import('lit').CSSResult[];
    open: boolean;
    noScrollLock: boolean;
    noBackdropClose: boolean;
    /**
     * request-only 模式下，Escape、遮罩和关闭按钮只派发 `open-change` 请求，
     * 不会自行修改 `open`。Consumer 回写 `open` 后才执行关闭动画。
     */
    requestOnly: boolean;
    get placement(): DrawerPlacement;
    set placement(v: string);
    private _placement;
    heading: string;
    closable: boolean;
    /**
     * Headless 模式：只保留 overlay 基础设施（backdrop、动画、scroll lock、dialog 语义），
     * 移除内置 UI（glass 样式、header、close 按钮、footer）。Consumer 自定义内容样式。
     */
    headless: boolean;
    /**
     * 内部原生 dialog 的 accessible name。headless 模式必须由 Consumer 提供，
     * 因为该模式不会渲染可自动关联的内置 header。
     */
    dialogLabel: string;
    private get dialog();
    private _hasHeaderSlot;
    private _hasFooterSlot;
    private readonly _userOpenChange;
    private readonly _scrollLock;
    private readonly _presence;
    connectedCallback(): void;
    firstUpdated(): void;
    disconnectedCallback(): void;
    private _checkSlotContent;
    private handleHeaderSlotChange;
    private handleFooterSlotChange;
    protected updated(props: PropertyValues): void;
    private handleTransitionEnd;
    private handleKeydown;
    show(): void;
    close(): void;
    private readonly _closeFromUser;
    private handleCancel;
    private handleNativeClose;
    private handleBackdropClick;
    private emitOpenChange;
    private _syncScrollLock;
    render(): import('lit').TemplateResult<1>;
    readonly $events: {
        'open-change': CustomEvent<{
            open: boolean;
        }>;
    };
}
declare global {
    interface HTMLElementTagNameMap {
        'web-ui-drawer': WebUiDrawer;
    }
}
export {};