/**
 * adapters/kokoro/media.ts — Audio transcription via Whisper CLI.
 *
 * Transport-agnostic: only handles local audio files.
 * Downloading media from WhatsApp/Telegram stays in per-project code.
 */
/** Absolute path to the Whisper CLI binary. */
export declare const WHISPER_BIN: string;
/** Whisper model (overridable via env). */
export declare const WHISPER_MODEL: string;
/**
 * Map a MIME type to a sensible file extension for images.
 */
export declare function mimetypeToExt(mimetype: string | null | undefined): string;
/**
 * Map a MIME type to a sensible file extension for documents.
 */
export declare function mimetypeToDocExt(mimetype: string | null | undefined): string;
/**
 * Transcribe a local audio file using the Whisper CLI.
 *
 * @param audioPath - Absolute path to the audio file (WAV, OGG, MP3, etc.)
 * @param label - Label prefix for the transcript (e.g. "[Voice note]" or "[Audio]")
 * @returns Formatted transcript string, or null on failure.
 */
export declare function transcribeAudio(audioPath: string, label?: string): Promise<string | null>;
/**
 * Split text into chunks suitable for sequential TTS voice notes.
 * Splits at paragraph breaks, then sentence boundaries, then commas,
 * then word boundaries. Guarantees no chunk exceeds maxChars.
 */
export declare function splitIntoChunks(text: string, maxChars?: number): string[];
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