import type { NotificationChannel, ChannelConfig, NotificationEvent } from '../types';
/**
 * 解析 Activity Streams 2.0 消息为 NotificationEvent
 */
export declare function parseActivityStreamsMessage(data: string): NotificationEvent;
/**
 * Channel 抽象基类
 */
export declare abstract class BaseChannel implements NotificationChannel {
    protected _connected: boolean;
    protected readonly config: ChannelConfig;
    constructor(config: ChannelConfig);
    get connected(): boolean;
    abstract connect(): Promise<void>;
    abstract disconnect(): void;
    /**
     * 处理收到的消息
     */
    protected handleMessage(data: string): void;
    /**
     * 处理错误
     */
    protected handleError(error: Error): void;
    /**
     * 处理连接关闭
     */
    protected handleClose(): void;
}
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