import type { AIMessageContent, AttachmentContent, ChatMessagesData, ImageContent, MarkdownContent, SearchContent, SuggestionContent, TextContent, ThinkingContent, ToolCallContent, UserMessageContent } from '../type';
/**
 * 应用JSON Patch操作到状态对象
 * 使用fast-json-patch库实现RFC6902规范的JSON Patch操作
 * @param state 原始状态对象
 * @param delta 包含patch操作的数组
 * @returns 更新后的新状态对象
 */
export declare function applyJsonPatch(state: any, delta: any[]): any;
/**
 * 安全解析JSON字符串的工具函数
 *
 * @param value 待解析的值，可能是字符串或已解析的对象
 * @param fallbackValue 解析失败时的回退值，默认为原值
 * @param errorContext 错误上下文，用于日志输出
 * @returns 解析后的值或回退值
 */
export declare function safeParseJSON<T = any>(value: any, fallbackValue?: T, errorContext?: string): T;
export declare function findTargetElement(event: MouseEvent, selector: string | string[]): HTMLElement | null;
export declare function isUserMessage(message: ChatMessagesData): message is import("../type").UserMessage;
export declare function isAIMessage(message: ChatMessagesData): message is import("../type").AIMessage;
export declare function isThinkingContent(content: AIMessageContent): content is ThinkingContent;
export declare function isTextContent(content: AIMessageContent): content is TextContent;
export declare function isMarkdownContent(content: AIMessageContent): content is MarkdownContent;
export declare function isImageContent(content: AIMessageContent): content is ImageContent;
export declare function isSearchContent(content: AIMessageContent): content is SearchContent;
export declare function isSuggestionContent(content: AIMessageContent): content is SuggestionContent;
export declare function isAttachmentContent(content: UserMessageContent): content is AttachmentContent;
export declare function isToolCallContent(content: AIMessageContent): content is ToolCallContent;
export declare function isReasoningContent(content: any): boolean;
/** 提取消息复制内容 */
export declare function getMessageContentForCopy(message: ChatMessagesData): string;