/**
 * ElevenLabs Speech-to-Text (Scribe) Handler
 *
 * Batch transcription via `POST /v1/speech-to-text`. Shares the
 * `ELEVENLABS_API_KEY` / `ELEVENLABS_BASE_URL` environment with the ElevenLabs
 * TTS and music handlers — same account, different endpoint.
 *
 * @module voice/providers/ElevenLabsSTT
 */
import type { TTSAudioFormat, STTCredentials, STTHandler, STTLanguage, STTOptions, STTResult } from "../../types/index.js";
/**
 * ElevenLabs Scribe Speech-to-Text Handler
 *
 * Batch-only (no `transcribeStream`). Word timings and speaker labels come
 * back on every response when the audio has them; `diarize` asks Scribe to
 * attribute words to speakers.
 *
 * @see https://elevenlabs.io/docs/api-reference/speech-to-text/convert
 */
export declare class ElevenLabsSTT implements STTHandler {
    private readonly apiKey;
    private readonly baseUrl;
    private readonly defaultTimeoutMs;
    /** Scribe accepts files up to 1 GB / ~4.5 hours; 2 hours is a conservative cap. */
    readonly maxAudioDuration = 7200;
    readonly supportsStreaming = false;
    /**
     * @param apiKeyOrCredentials - The `credentials.stt.elevenlabs` slice
     *   (`apiKey`, `baseURL`, `timeoutMs`), or an API key (the original
     *   positional form). The environment fills whatever is left out:
     *   `ELEVENLABS_API_KEY`, and `ELEVENLABS_STT_BASE_URL` before the
     *   account-wide `ELEVENLABS_BASE_URL`.
     */
    constructor(apiKeyOrCredentials?: string | STTCredentials["elevenlabs"]);
    isConfigured(): boolean;
    getSupportedFormats(): TTSAudioFormat[];
    getSupportedLanguages(): Promise<STTLanguage[]>;
    transcribe(audio: Buffer | ArrayBuffer, options?: STTOptions): Promise<STTResult>;
    private toSTTResult;
    /** A usable timeout: a finite, positive number of milliseconds. */
    private static validTimeout;
    /** A finite number clamped to [0, 1]; `undefined` for anything else. */
    private static unitInterval;
    /** Mean `exp(logprob)` over the words that carry a finite one, clamped to [0, 1]; `undefined` when none does. */
    private static meanWordConfidence;
    /** Scribe takes ISO 639-1/3 codes; a BCP-47 tag like `en-US` or `pt_BR` is reduced to its primary subtag. */
    private toScribeLanguageCode;
    private getMimeType;
    /** 429 and 5xx are worth a resend; every other status is a fixed error. */
    private static isRetriableStatus;
    private static normalizeBaseUrl;
}