/**
 * Voice message transcription using OpenAI Whisper API
 *
 * Transcribes audio buffers to text using the OpenAI audio transcription endpoint.
 * Uses native fetch + FormData (Node 18+), no additional npm dependencies required.
 *
 * @module voice-transcriber
 */
export interface TranscribeOptions {
    /** OpenAI API key */
    apiKey: string;
    /** Whisper model to use (default: "whisper-1") */
    model?: string;
    /** Language hint for better accuracy (ISO 639-1, e.g., "en") */
    language?: string;
}
export interface TranscribeResult {
    /** The transcribed text */
    text: string;
}
/**
 * Transcribe an audio buffer using the OpenAI Whisper API
 *
 * @param audioBuffer - The audio file contents as a Buffer
 * @param filename - Original filename (used for content-type detection)
 * @param options - Transcription options including API key and model
 * @returns The transcription result with text
 * @throws Error if the API call fails
 */
export declare function transcribeAudio(audioBuffer: Buffer, filename: string, options: TranscribeOptions): Promise<TranscribeResult>;
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