/**
 * Plain-English explanations for the useapi Google Flow refusals that a retry
 * can never fix. Pure: every Flow HTTP caller in `src/` passes a failed
 * response's status and body here BEFORE deciding whether to retry, so
 * the retry decision and the message cannot drift apart between callers.
 *
 * Spec: https://useapi.net/assets/aibot/api-google-flow-v1.txt (generated
 * 2026-09-25). Changelog entries this module covers:
 *  - 2026-09-16: every account added before that date runs on Google's retiring
 *    `labs` backend. `GET /characters`, `GET /voices`, `GET /assets/media/{email}`
 *    and `POST /videos/concatenate` already return 404 "Flow RPCs have been
 *    deprecated and disabled"; generation stops once Google finishes the
 *    switch-off. The fix is to re-add the account. Code does not change.
 *  - 2026-09-23: `403 PUBLIC_ERROR_MODEL_ACCESS_DENIED` means the account's plan
 *    does not offer the model. That includes `veo-3.1-lite-low-priority` on an
 *    invited member of an Ultra family plan. It passed the captcha, so raising
 *    `captchaRetry` cannot help, and the 503 useapi briefly documented for it
 *    was withdrawn.
 *  - `429 no_eligible_account`: every account is quarantined for this model.
 *    The body carries `message`, `retryAfter` and a per-account `skipReasons[]`.
 */
export type FlowRefusalKind = 'model-access-denied' | 'labs-backend-retired' | 'no-eligible-account';
export interface FlowRefusal {
    kind: FlowRefusalKind;
    /** True when retrying the same request cannot succeed. */
    terminal: boolean;
    message: string;
}
export declare const FLOW_READD_ACCOUNT_STEP: string;
/**
 * Classify a failed useapi Google Flow response. Returns null for everything
 * else, so callers keep their existing handling (captcha retry, throttle
 * cooldown, moderation) unchanged.
 */
export declare function explainFlowRefusal(status: number, bodyText: string): FlowRefusal | null;
/** Account `backend` field (2026-09-16). Returns operator advice for `labs`, else null. */
export declare function flowAccountBackendAdvice(backend: unknown): string | null;
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