import { CSSResultArray, PropertyValues, TemplateResult } from 'lit';
import { SpectrumElement } from '../../shared/base';
declare const VALID_VARIANTS: string[];
export type AlertBannerVariants = (typeof VALID_VARIANTS)[number];
/**
 * Base class for alert banner components
 */
export declare abstract class AlertBannerBase extends SpectrumElement {
    static get styles(): CSSResultArray;
    /**
     * Controls the display of the alert banner
     *
     * @param {Boolean} open
     */
    open: boolean;
    /**
     * Whether to include an icon-only close button to dismiss the alert banner
     *
     * @param {Boolean} dismissible
     */
    dismissible: boolean;
    /**
     * The variant applies specific styling when set to `negative` or `info`;
     * `variant` attribute is removed when it's passed an invalid variant.
     *
     * @param {String} variant
     */
    set variant(variant: AlertBannerVariants);
    get variant(): AlertBannerVariants;
    private _variant;
    protected isValidVariant(variant: string): boolean;
    protected abstract renderIcon(variant: string): TemplateResult;
    protected shouldClose(): void;
    close(): void;
    protected handleKeydown(event: KeyboardEvent): void;
    protected updated(changes: PropertyValues): void;
}
export {};