/**
 * Main FetchProxy class implementation
 */
import type { ProxyOptions, ProxyRequestOptions, CircuitState } from "./types";
export declare class FetchProxy {
    private options;
    private circuitBreaker;
    private urlCache;
    private proxyLogger;
    constructor(options?: ProxyOptions);
    proxy(req: Request, source?: string, options?: ProxyRequestOptions): Promise<Response>;
    private executeRequest;
    private buildTargetURL;
    private prepareHeaders;
    private prepareRequestOptions;
    private addQueryString;
    getCircuitBreakerState(): CircuitState;
    getCircuitBreakerFailures(): number;
    clearURLCache(): void;
    close(): void;
    /**
     * Execute before request hooks
     */
    private executeBeforeRequestHooks;
    /**
     * Execute before circuit breaker hooks
     */
    private executeBeforeCircuitBreakerHooks;
    /**
     * Execute after circuit breaker hooks
     */
    private executeAfterCircuitBreakerHooks;
    /**
     * Execute after response hooks
     */
    private executeAfterResponseHooks;
}
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