import type { ProviderConfig } from "./types.js";
/**
 * Default fallback URL for cold start mitigation.
 * This always-on endpoint handles requests when the primary endpoint has a cold start.
 */
export declare const DEFAULT_FALLBACK_URL = "https://superagent.sh/api/fallback";
/**
 * Default timeout in milliseconds before falling back to the always-on endpoint.
 * If the primary endpoint doesn't respond within this time, the request is
 * cancelled and retried on the fallback endpoint.
 */
export declare const DEFAULT_FALLBACK_TIMEOUT_MS = 5000;
/**
 * Get the fallback URL based on priority:
 * 1. Client option (highest priority)
 * 2. Environment variable SUPERAGENT_FALLBACK_URL
 * 3. Default constant (lowest priority)
 */
export declare function getFallbackUrl(clientOption?: string): string;
/**
 * Superagent provider configuration
 */
export declare const superagentProvider: ProviderConfig;
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