import { CSSResultGroup, TemplateResult, LitElement } from 'lit';
import { SbbTitleLevel } from '../../title.js';

/**
 * It can be used as a container for one or more `sbb-alert` component.
 *
 * @slot - Use the unnamed slot to add `sbb-alert` elements to the `sbb-alert-group`.
 * @slot accessibility-title - title for this `sbb-alert-group` which is only visible for screen reader users.
 * @event {CustomEvent<SbbAlertElement>} didDismissAlert - Emits when an alert was removed from DOM.
 * @event {CustomEvent<void>} empty - Emits when `sbb-alert-group` becomes empty.
 */
export declare class SbbAlertGroupElement extends LitElement {
    static styles: CSSResultGroup;
    static readonly events: {
        readonly didDismissAlert: "didDismissAlert";
        readonly empty: "empty";
    };
    /**
     * The role attribute defines how to announce alerts to the user.
     *
     * 'status': sets aria-live to polite and aria-atomic to true.
     * 'alert': sets aria-live to assertive and aria-atomic to true.
     */
    role: 'alert' | 'status' | string;
    /** Title for this alert group which is only visible for screen reader users. */
    accessibilityTitle?: string;
    /** Level of the accessibility title, will be rendered as heading tag (e.g. h2). Defaults to level 2. */
    accessibilityTitleLevel: SbbTitleLevel;
    /** Whether the group currently has any alerts. */
    private _hasAlerts?;
    /** Emits when an alert was removed from DOM. */
    private _didDismissAlert;
    /** Emits when `sbb-alert-group` becomes empty. */
    private _empty;
    private _abort;
    private _removeAlert;
    connectedCallback(): void;
    private _slotChanged;
    protected render(): TemplateResult;
}
declare global {
    interface HTMLElementTagNameMap {
        'sbb-alert-group': SbbAlertGroupElement;
    }
}
//# sourceMappingURL=alert-group.d.ts.map