import type { ProxyHandle, StartFallbackProxyOptions } from './api-proxy-types.js';
export { buildApiKeyHeaders, buildPassthroughHeaders, isRetryableStatus, looksLikeErrorBody, stripOauthBeta, } from './api-proxy-headers.js';
/**
 * Start the fallback proxy.
 *
 * In `oauth-first` mode the proxy implements live transitions in both
 * directions: it falls back to the API key on subscription failures, then
 * periodically probes OAuth so the running claude session can return to
 * subscription billing as soon as the rate limit clears — no restart.
 *
 * In `api-first` mode the proxy always uses the API key.
 */
export declare function startFallbackProxy(opts: StartFallbackProxyOptions): Promise<ProxyHandle>;