import type { BroadcastIconsChangeMessage, IconMeta, IconsCollection, SvgIcon } from './registry/types.js';
type IconBroadcastEvent = MessageEvent<BroadcastIconsChangeMessage> | PageTransitionEvent;
/**
 * Manages cross-context synchronization of icon state using the BroadcastChannel API.
 *
 * @remarks
 * This class enables icon registry state to be shared between different browsing contexts
 * (e.g., iframes, tabs) within the same origin. It specifically handles synchronization
 * with Angular elements that may be running in separate contexts.
 *
 * The broadcast channel is automatically created on page show and disposed on page hide
 * to properly handle bfcache (back/forward cache) scenarios.
 */
export declare class IconsStateBroadcast {
    private static readonly _origin;
    private readonly _iconsCollection;
    private readonly _iconReferences;
    private _channel;
    /**
     * Creates an instance of IconsStateBroadcast.
     *
     * @param iconsCollection - The collection of registered SVG icons.
     * @param iconReferences - The collection of icon references/aliases.
     */
    constructor(iconsCollection: IconsCollection<SvgIcon>, iconReferences: IconsCollection<IconMeta>);
    /**
     * Sends a message to other browsing contexts via the broadcast channel.
     */
    send(data: BroadcastIconsChangeMessage): void;
    /** @internal */
    handleEvent(event: IconBroadcastEvent): void;
    private _syncState;
    private _create;
    private _dispose;
    private _getUserRefsCollection;
    private _getUserSetCollection;
}
export {};