export type NarrationTestTtsSuccessPayload = {
    audioBase64: string;
    byteLength: number;
    mimeType: string;
    narrationRequestId: string;
    dryRun: boolean;
};
type Wrapped = {
    data: NarrationTestTtsSuccessPayload;
};
/**
 * Single POST to test TTS — avoids admin client replaying the request after 401 refresh
 * (which would call ElevenLabs twice for the same demo).
 */
export declare function postNarrationTestTtsOnce(voiceId: string, token: string | null, opts?: {
    providerId?: string;
}): Promise<Wrapped>;
export {};