/**
 * Logger interface for HttpClient
 */
export interface HttpLogger {
    debug: (message: string, meta?: Record<string, unknown>) => void;
    error: (message: string, meta?: Record<string, unknown>) => void;
    info: (message: string, meta?: Record<string, unknown>) => void;
    warn: (message: string, meta?: Record<string, unknown>) => void;
}
export declare const setHttpLogger: (logger: HttpLogger) => void;
/**
 * Shared HTTP client with connection management and pooling
 * Prevents connection exhaustion and improves performance
 */
export declare class HttpClient {
    private static instance;
    private readonly agents;
    private readonly userAgent;
    private constructor();
    static getInstance(userAgent?: string): HttpClient;
    /**
     * Set custom user agent for all requests
     */
    setUserAgent(userAgent: string): void;
    /**
     * Get or create HTTP agent for a domain with connection pooling
     */
    private getAgent;
    /**
     * Make HTTP request with proper connection management using axios
     */
    fetch(url: string, options?: RequestInit): Promise<Response>;
    /**
     * Cleanup unused connections (called periodically)
     */
    cleanup(): void;
    /**
     * Graceful shutdown - close all connections
     */
    shutdown(): Promise<void>;
}
export declare const getHttpClient: (userAgent?: string) => HttpClient;
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