/**
 * TTS Text Processing Utilities
 *
 * Stateless utility functions for text segmentation and NDJSON processing.
 * These functions are designed to be pure functions without side effects.
 */
/**
 * Split input text into sentence chunks suitable for TTS processing.
 *
 * Enhanced version that implements intelligent text segmentation respecting
 * sentence boundaries while ensuring each chunk stays within TTS API limits.
 * It handles various punctuation patterns and provides graceful fallback to
 * word/character boundaries when necessary.
 *
 * Chunking Strategy:
 * 1. First, split by sentence boundaries (multilingual punctuation)
 * 2. Merge sentences into chunks up to maxLength
 * 3. If a sentence exceeds maxLength:
 *    - For text with spaces: split by words
 *    - For text without spaces (Japanese, etc.): split by characters
 *
 * @param text - Input text to be segmented
 * @param maxLength - Maximum length of each chunk
 * @returns Array of text chunks, each guaranteed to be <= maxLength
 */
export declare function chunkText(text: string, maxLength?: number): string[];
/**
 * Extract audio data from NDJSON response.
 *
 * Handles both single JSON object and NDJSON (multiple lines) formats.
 * Decodes base64-encoded audio data and returns as binary.
 *
 * @param ndjsonStr - NDJSON string containing audio_base64 field
 * @returns Decoded binary audio data
 */
export declare function extractAudioFromNdjson(ndjsonStr: string): Uint8Array;
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