import { PropertyValues } from 'lit';
import { SpectrumElement } from '../../element/index.js';
import { AvatarSize } from './Avatar.types.js';
/**
 * Base class for the avatar component.
 *
 * Provides the core API for displaying a circular profile image. Concrete
 * classes supply the stylesheet and render template.
 */
export declare abstract class AvatarBase extends SpectrumElement {
    /**
     * @internal
     *
     * The set of valid numeric size values for the avatar.
     *
     * This is an internal property not intended for consumer use, but used in
     * internal validation logic, stories, and tests to keep them in sync with
     * the canonical type definition in `Avatar.types.ts`.
     */
    static readonly VALID_SIZES: readonly AvatarSize[];
    /**
     * URL of the profile image to display.
     */
    src: string;
    /**
     * Text description of the avatar image.
     */
    alt: string | undefined;
    /**
     * The size of the avatar. Invalid values fall back to the default (500).
     *
     * @default 500
     */
    get size(): AvatarSize;
    set size(value: AvatarSize);
    private _size;
    /**
     * Renders a visual outline around the avatar image.
     */
    outline: boolean;
    /**
     * Renders the avatar at reduced opacity, indicating the entity is inactive or unavailable.
     */
    disabled: boolean;
    /**
     * Marks the avatar as decorative, hiding it from assistive technology.
     */
    decorative: boolean;
    protected firstUpdated(changes: PropertyValues): void;
    protected updated(changes: PropertyValues): void;
    private _syncAriaHidden;
    private _warnMissingAlt;
}