export declare function formatError(error: unknown): {
    message: string;
    responseData?: unknown;
};
export declare function extractApiCode(responseData: unknown): number | undefined;
export declare function stringifyErrorPayload(payload: unknown): string;
export declare function isUniversalCardBuildFailure(responseData: unknown): boolean;
export declare function isCompletionNotFoundError(responseData: unknown): boolean;
export declare function isRetryableError(error: unknown): boolean;
export interface RetryOptions {
    maxAttempts: number;
    baseDelayMs: number;
    maxDelayMs: number;
}
export declare const DEFAULT_RETRY_OPTIONS: RetryOptions;
export declare function withRetry<T>(fn: () => Promise<T>, options?: RetryOptions): Promise<T>;
export type ConnectionState = 'disconnected' | 'connecting' | 'connected';
export declare function buildFallbackInteractiveCard(sourceCard: object): object;
export interface FeishuEventData {
    event_id?: string;
    token?: string;
    create_time?: string;
    event_type?: string;
    tenant_key?: string;
    ts?: string;
    uuid?: string;
    type?: string;
    app_id?: string;
    sender: {
        sender_id?: {
            union_id?: string;
            user_id?: string;
            open_id?: string;
        };
        sender_type: string;
        tenant_key?: string;
    };
    message: {
        message_id: string;
        root_id?: string;
        parent_id?: string;
        create_time: string;
        update_time?: string;
        chat_id: string;
        thread_id?: string;
        chat_type: string;
        message_type: string;
        content: string;
        mentions?: Array<{
            key: string;
            id: {
                union_id?: string;
                user_id?: string;
                open_id?: string;
            };
            name: string;
            tenant_key?: string;
        }>;
        user_agent?: string;
    };
}
export interface FeishuMessageEvent {
    messageId: string;
    chatId: string;
    threadId?: string;
    chatType: 'p2p' | 'group';
    senderId: string;
    senderType: 'user' | 'bot';
    content: string;
    msgType: string;
    attachments?: FeishuAttachment[];
    mentions?: Array<{
        key: string;
        id: {
            open_id: string;
        };
        name: string;
    }>;
    rawEvent: FeishuEventData;
}
export interface FeishuAttachment {
    type: 'image' | 'file';
    fileKey: string;
    fileName?: string;
    fileType?: string;
    fileSize?: number;
}
export declare function getString(value: unknown): string | undefined;
export declare function getNumber(value: unknown): number | undefined;
export declare function collectAttachmentsFromContent(content: unknown): FeishuAttachment[];
export declare function extractTextFromPost(content: unknown): string;
export interface FeishuCardActionEvent {
    openId: string;
    action: {
        tag: string;
        value: Record<string, unknown>;
    };
    token: string;
    messageId?: string;
    chatId?: string;
    threadId?: string;
    rawEvent: unknown;
}
export type FeishuCardActionResponse = object;
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