/**
 * 统一的错误类型定义
 * 替代分散在各处的 try-catch 和错误处理
 */
export type ErrorCode = 'NETWORK_ERROR' | 'TOOL_CALL_ERROR' | 'MODEL_ERROR' | 'RAG_ERROR' | 'STORAGE_ERROR' | 'AUDIO_ERROR' | 'AUTH_ERROR' | 'UNKNOWN_ERROR';
export declare class ChatError extends Error {
    readonly code: ErrorCode;
    readonly details?: any | undefined;
    constructor(message: string, code: ErrorCode, details?: any | undefined);
    toJSON(): {
        name: string;
        message: string;
        code: ErrorCode;
        details: any;
    };
}
export declare function isChatError(error: unknown): error is ChatError;
export declare function createChatError(message: string, code: ErrorCode, details?: any): ChatError;