export type GoogleFlowFetchLike = (url: string, init: {
    method: string;
    headers: Record<string, string>;
    body?: string;
}) => Promise<{
    ok: boolean;
    status: number;
    text(): Promise<string>;
}>;
export declare const GOOGLE_FLOW_BASE = "https://api.useapi.net/v1/google-flow";
export type GoogleFlowUpscaleResolution = '1080p' | '4K';
export interface UpscaleFlowVideoInput {
    /** Bearer token (USEAPI_API_TOKEN). */
    apiToken: string;
    /** A Flow-GENERATED video id (`user:..-email:..-video:..`). NOT an uploaded/edited file. */
    mediaGenerationId: string;
    /** Target resolution. '1080p' (default) is free; '4K' costs 50 credits + Ultra. */
    resolution?: GoogleFlowUpscaleResolution;
    fetchImpl?: GoogleFlowFetchLike;
    /**
     * Transient-retry budget for 429/5xx/network errors (default 2). Retrying is
     * SAFE here: useapi Flow endpoints throttle routinely, and re-upscaling the
     * same mediaGenerationId is cached server-side (no extra credits).
     */
    maxRetries?: number;
    /** Base backoff between retries, ms (default 1000; grows linearly). */
    retryBackoffMs?: number;
    /**
     * captcha-retry auto-solve count (`captchaRetry`). Omit → VCLAW_FLOW_CAPTCHA_RETRY
     * (default 3); 0 opts out (no field sent).
     */
    captchaRetry?: number;
}
export interface UpscaleFlowVideoResult {
    /** Signed MP4 URL of the upscaled video (download promptly — it expires). */
    videoUrl: string;
    /** The upscaled clip's own Flow media id (re-upscale/chain target). */
    mediaGenerationId: string | null;
    /** Credits left after the call (1080p leaves it unchanged — it's free). */
    remainingCredits: number | null;
    raw: unknown;
}
/**
 * Upscale a Flow-generated video (synchronous; 30–60s). Throws on a non-2xx
 * response or a body without a video URL. The `mediaGenerationId` MUST be a Flow
 * generation — an external/edited clip is rejected by the API.
 */
export declare function upscaleFlowVideo(input: UpscaleFlowVideoInput): Promise<UpscaleFlowVideoResult>;
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