/**
 * SyncChannel - Channel-based API for real-time features
 *
 * Provides a composable API for presence tracking, custom events,
 * and channel-scoped communication.
 */
import type { RealtimeClient } from '../realtime/client.js';
import { PresenceStore } from './presence.svelte.js';
import type { User } from './presence.svelte.js';
export interface ChannelOptions {
    /** Enable presence tracking for this channel */
    presence?: boolean;
    /** Enable custom event broadcasting */
    broadcast?: boolean;
}
export interface ChannelOptionsResolved {
    presence: boolean;
    broadcast: boolean;
}
/**
 * Channel for scoped real-time communication
 */
export declare class SyncChannel {
    readonly name: string;
    readonly presence: PresenceStore | null;
    private realtimeClient;
    private options;
    private subscribed;
    private eventHandlers;
    constructor(realtimeClient: RealtimeClient, name: string, user?: User, options?: ChannelOptions);
    private unsubscribeEphemeral?;
    private setupEventListeners;
    /**
     * Subscribe to the channel
     */
    subscribe(): Promise<void>;
    unsubscribe(): Promise<void>;
    /**
     * Track presence state (if presence is enabled)
     */
    track<T>(state: T): void;
    /**
     * Stop tracking presence
     */
    untrack(): void;
    /**
     * Listen for custom events on this channel
     */
    on<T>(event: string, handler: (data: T) => void): () => void;
    /**
     * Broadcast a custom event to all subscribers of this channel
     */
    broadcast<T>(event: string, data: T): Promise<void>;
    /**
     * Check if the channel is subscribed
     */
    isSubscribed(): boolean;
}