/**
 * OpenRouter API client for chat completions
 */
import type { ChatCompletionRequest, ChatCompletionResponse, ChatCompletionChunk, ModelsListResponse, ApiKeyValidationResponse, APIMessage } from '../types/index.js';
export interface OpenRouterClientOptions {
    apiKey: string;
    timeout?: number;
}
export declare class OpenRouterClient {
    private readonly apiKey;
    private readonly timeout;
    constructor(options: OpenRouterClientOptions);
    /**
     * Create a chat completion (non-streaming)
     */
    createChatCompletion(request: ChatCompletionRequest): Promise<ChatCompletionResponse>;
    /**
     * Create a chat completion with streaming
     */
    streamChatCompletion(request: ChatCompletionRequest, signal?: AbortSignal): AsyncGenerator<ChatCompletionChunk>;
    /**
     * List available models
     */
    listModels(): Promise<ModelsListResponse>;
    /**
     * Validate API key
     */
    validateApiKey(): Promise<ApiKeyValidationResponse>;
    /**
     * Convert internal messages to API format
     */
    static toAPIMessages(messages: Array<{
        role: string;
        content: string;
    }>): APIMessage[];
    /**
     * Get request headers
     */
    private getHeaders;
    /**
     * Fetch with retry logic
     */
    private fetchWithRetry;
    /**
     * Handle error response
     */
    private handleErrorResponse;
    /**
     * Sleep for a specified duration
     */
    private sleep;
}
//# sourceMappingURL=openrouter.d.ts.map