/**
 * StepFun / 阶跃星辰 StepAudio 2.5 ASR.
 * Docs: https://platform.stepfun.com/docs/zh/guides/models/stepaudio-2.5-asr
 * API:  https://platform.stepfun.com/docs/zh/api-reference/audio/transcriptions
 *
 * Sync multipart upload (OpenAI-compatible shape):
 *   POST {base}/audio/transcriptions
 *   model=stepaudio-2.5-asr, response_format=json, file=<audio>
 *
 * Env:
 *   AGIM_STEPFUN_API_KEY           — preferred; falls back to STEPFUN_API_KEY / STEP_API_KEY
 *   AGIM_STEPFUN_BASE_URL          — optional, default https://api.stepfun.com/v1
 *   AGIM_STEPFUN_TRANSCRIBE_MODEL  — optional, default stepaudio-2.5-asr
 *
 * Vendor accepts mp3 / pcm / ogg / wav (<100 MB). We convert to 16 kHz WAV.
 */
export declare function isStepfunSpeechConfigured(): boolean;
export declare function transcribeWithStepfun(filePath: string, _opts?: {
    language?: string;
}): Promise<string>;
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