/**
 * Represents a single message in a chat conversation.
 */
export type ChatMessage = Record<string, any>;
/**
 * Represents a tool definition for function calling.
 */
export type ToolDefinition = Record<string, any>;
/**
 * Extra context for custom template variables.
 */
export type ExtraContext = Record<string, any>;
/**
 * ChatHistory manages conversation messages and optional metadata for chat templates.
 *
 * @example
 * ```typescript
 * // Create an empty chat history
 * const history = new ChatHistory();
 *
 * // Add messages
 * history.push({ role: "system", content: "You are a helpful assistant." });
 * history.push({ role: "user", content: "Hello!" });
 * history.push({ role: "assistant", content: "Hi! How can I help you?" });
 *
 * // Create with initial messages
 * const history2 = new ChatHistory([
 *   { role: "system", content: "You are a helpful assistant." },
 *   { role: "user", content: "What's the weather?" }
 * ]);
 *
 * // Set tools for function calling
 * history.setTools([
 *   {
 *     type: "function",
 *     function: {
 *       name: "get_weather",
 *       description: "Get the current weather",
 *       parameters: {
 *         type: "object",
 *         properties: {
 *           location: { type: "string" }
 *         }
 *       }
 *     }
 *   }
 * ]);
 * ```
 */
export interface ChatHistory {
    /**
     * Creates a new ChatHistory instance.
     * @param messages - Optional array of initial messages
     */
    new (messages?: ChatMessage[]): ChatHistory;
    /**
     * Adds a message to the end of the chat history.
     * @param message - The message to add
     * @returns The ChatHistory instance for method chaining
     *
     * @example
     * ```typescript
     * history.push({ role: "user", content: "Hello!" });
     * ```
     *
     * @note The message structure is flexible and depends on the model used.
     */
    push(message: ChatMessage): ChatHistory;
    /**
     * Removes the last message from the chat history.
     * @throws {Error} If the history is empty
     */
    pop(): void;
    /**
     * Returns all messages in the chat history.
     * @returns Array of messages
     */
    getMessages(): ChatMessage[];
    /**
     * Replace all messages with a new list.
     *
     * @param messages - The new list of messages
     * @returns The ChatHistory instance for method chaining
     */
    setMessages(messages: ChatMessage[]): ChatHistory;
    /**
     * Removes all messages from the chat history.
     */
    clear(): void;
    /**
     * Returns the number of messages in the chat history.
     * @returns The number of messages
     */
    size(): number;
    /**
     * Checks if the chat history is empty.
     * @returns true if the history contains no messages, false otherwise
     *
     * @example
     * ```typescript
     * if (history.empty()) {
     *   console.log("No messages yet");
     * }
     * ```
     */
    empty(): boolean;
    /**
     * Sets the tools array for function calling.
     * @param tools - Array of tool definitions
     * @returns The ChatHistory instance for method chaining
     *
     * @example
     * ```typescript
     * history.setTools([
     *   {
     *     type: "function",
     *     function: {
     *       name: "get_weather",
     *       description: "Get current weather",
     *       parameters: {
     *         type: "object",
     *         properties: {
     *           location: { type: "string", description: "City name" }
     *         },
     *         required: ["location"]
     *       }
     *     }
     *   }
     * ]);
     * ```
     *
     * @note The tool structure is flexible and depends on the model used.
     */
    setTools(tools: ToolDefinition[]): ChatHistory;
    /**
     * Gets the tools array.
     * @returns The tools array
     */
    getTools(): ToolDefinition[];
    /**
     * Sets extra context for custom template variables.
     * @param context - Object containing custom variables
     * @returns The ChatHistory instance for method chaining
     *
     * @example
     * ```typescript
     * history.setExtraContext({
     *   user_name: "Alice",
     *   date: "2025-01-01",
     *   custom_instruction: "Be concise"
     * });
     * ```
     *
     * @note The extra context structure is flexible and depends on the model used.
     */
    setExtraContext(context: ExtraContext): ChatHistory;
    /**
     * Gets the extra context.
     * @returns The extra context object
     */
    getExtraContext(): ExtraContext;
}