/**
 * OpenAI LLM Client Implementation
 *
 * Implements the LLMClient interface for OpenAI's GPT models.
 * Supports chat, streaming, function calling, and token counting.
 */
import { LLMClient, LLMClientConfig, ChatParams, ChatResponse, ChatChunk, Message } from '../client';
/**
 * OpenAI Client implementing LLMClient interface
 */
export declare class OpenAIClient implements LLMClient {
    readonly provider = "openai";
    private client;
    private config;
    constructor(config: LLMClientConfig);
    /**
     * Generate a chat completion
     */
    chat(params: ChatParams): Promise<ChatResponse>;
    /**
     * Generate a streaming chat completion
     */
    chatStream(params: ChatParams): AsyncIterableIterator<ChatChunk>;
    /**
     * Count tokens in a message or text
     */
    countTokens(input: string | Message[], model: string): Promise<number>;
    /**
     * List available OpenAI models
     */
    listModels(): Promise<string[]>;
    /**
     * Validate API credentials
     */
    validateCredentials(): Promise<boolean>;
    /**
     * Convert our ChatParams to OpenAI format
     */
    private convertChatParams;
    /**
     * Convert our Message format to OpenAI format
     */
    private convertMessages;
    /**
     * Convert our ToolDefinition format to OpenAI format
     */
    private convertTools;
    /**
     * Convert OpenAI ChatCompletion to our ChatResponse format
     */
    private convertChatResponse;
    /**
     * Convert OpenAI stream chunk to our ChatChunk format
     */
    private convertStreamChunk;
    /**
     * Convert OpenAI finish reason to our format
     */
    private convertFinishReason;
    /**
     * Estimate token count when tiktoken is unavailable
     */
    private estimateTokens;
    /**
     * Handle and convert OpenAI errors to our error types
     */
    private handleError;
}
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