/**
 * Optional speech-to-text for inbound Telegram audio (voice / audio / video_note).
 * The transcriber posts the downloaded bytes to an OpenAI-compatible
 * `/v1/audio/transcriptions` endpoint (e.g. a local WhisperKit server) and
 * returns the transcript text, which the download path then inlines into the
 * attachment's `text` field so a caption-less voice note reaches the model as
 * words, not just an on-disk file path.
 */
/** Transcription endpoint + model settings (the full transcriptions-route URL, not a base). */
export interface TelegramTranscriptionConfig {
    /** Full URL of the OpenAI-compatible transcriptions route (e.g. `http://localhost:50060/v1/audio/transcriptions`). */
    readonly endpoint: string;
    /** Model name sent as the multipart `model` part (required by the server). */
    readonly model: string;
    /** Optional ISO-639 language hint sent as the `language` part. */
    readonly language?: string;
    /**
     * Bound for one transcription call in milliseconds (default 120s, enforced
     * by the download path). Independent of `attachments.downloadTimeoutMs`:
     * download latency scales with file size, transcription latency with audio
     * duration.
     */
    readonly timeoutMs?: number;
}
/** A pluggable transcriber. The download path passes a per-call abort signal. */
export interface TelegramTranscriber {
    transcribe(input: {
        bytes: Uint8Array;
        mimeType: string;
        filename?: string;
    }, signal: AbortSignal): Promise<string>;
}
type FetchImpl = typeof fetch;
/**
 * Build a {@link TelegramTranscriber} that POSTs `multipart/form-data` (parts
 * `file`, `model`, and optional `language`) to an OpenAI-compatible
 * transcriptions endpoint and reads back `{ text }`. Uses only native `fetch` +
 * `FormData` + `Blob` (no added dependencies). A non-2xx response, or a body
 * without a non-empty `text` string, throws so the caller can fall back.
 */
export declare function createOpenAiTranscriber(config: TelegramTranscriptionConfig, fetchImpl?: FetchImpl): TelegramTranscriber;
export {};
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