/**
 * Sentence boundary detection — Decision D-4, I-5.1.
 *
 * Uses `Intl.Segmenter` with `{ granularity: 'sentence' }`:
 *   - Browser-native & Node 16+ — zero bundle size
 *   - Handles abbreviations (Mr., Dr.), decimals ($3.50), URLs, markdown
 *   - Language-aware (detects locale automatically)
 *   - No regex required
 */
/**
 * Given a streaming text buffer, extract all **complete** sentences and
 * return the remaining partial sentence that has not ended yet.
 *
 * The last segment from `Intl.Segmenter` is treated as incomplete because
 * more tokens may still arrive. All earlier segments are complete.
 *
 * I-5.5: This function is called on each new token during streaming.
 * On natural stream end, the remaining buffer is spoken as-is.
 *
 * @param buffer  Accumulated token buffer
 * @returns       `{ sentences, remaining }` — sentences ready to speak, leftover
 */
export declare function extractCompleteSentences(buffer: string): {
    sentences: string[];
    remaining: string;
};
/**
 * Split a **complete** text into all its sentences.
 * Use for pre-existing text — not for streaming buffers.
 */
export declare function splitSentences(text: string): string[];