import { BaseChannel } from './index';
/**
 * Feishu / Lark Channel — v1.1.0
 *
 * Supports:
 * - Event Subscription (webhook) mode for receiving messages
 * - Bot send via Feishu Open API
 * - URL verification challenge
 * - Message card (interactive) responses
 * - Group chat & P2P messaging
 * - Event deduplication
 * - No external dependencies (uses Node.js built-in http/https)
 */
export interface FeishuChannelConfig {
    /** Feishu App ID */
    appId?: string;
    /** Feishu App Secret */
    appSecret?: string;
    /** Verification token for event subscription */
    verificationToken?: string;
    /** Encrypt key (optional, for encrypted events) */
    encryptKey?: string;
    /** Webhook server port (default: 8081) */
    port?: number;
    /** API base URL (use 'https://open.larksuite.com' for Lark international) */
    apiBase?: string;
}
export declare class FeishuChannel extends BaseChannel {
    readonly type = "feishu";
    private config;
    private server;
    private tokenCache;
    private processedEvents;
    constructor(config?: FeishuChannelConfig);
    start(): Promise<void>;
    stop(): Promise<void>;
    /** Handle Feishu event */
    private handleEvent;
    /** Parse Feishu event body (exported for testing) */
    static parseEventBody(body: any): {
        type: string;
        challenge?: string;
        eventType?: string;
        content?: string;
        chatId?: string;
        senderId?: string;
        messageId?: string;
    };
    /** Get tenant access token (cached) */
    private getAccessToken;
    /** Send a text message to a chat */
    sendTextMessage(chatId: string, text: string): Promise<void>;
    /** Send an interactive card message */
    sendCardMessage(chatId: string, card: Record<string, unknown>): Promise<void>;
    /** Read request body */
    private readBody;
    /** HTTPS POST */
    private httpsPost;
    /** HTTPS POST with Bearer auth */
    private httpsPostWithAuth;
}
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