export declare const SMOOTH_STREAMING_COMMIT_INTERVAL_MS = 16;
export declare const SMOOTH_STREAMING_LONG_TEXT_THRESHOLD_GRAPHEMES = 640;
export declare const SMOOTH_STREAMING_LONG_TEXT_TAIL_GRAPHEMES = 180;
/**
 * Split `text` into grapheme clusters.
 *
 * Results are cached: when `text` is an append of a previously segmented
 * string, only the appended suffix is segmented (plus a small overlap) and
 * merged with the cached result, making this O(delta) instead of O(n) per
 * call.
 *
 * When the new text is not a prefix-extension of the cache (e.g. a full reset
 * or non-append change) we fall back to full segmentation and reset the cache.
 */
export declare function splitStreamingTextGraphemes(text: string): string[];
/**
 * Reset the incremental segmentation cache.  Call this when switching to a
 * new message so the cache from the previous message isn't carried over.
 * (Not strictly necessary for correctness — the cache is keyed on content —
 * but avoids holding a reference to the last message's text string.)
 */
export declare function resetSegmenterCache(): void;
export declare function initialSmoothStreamingGraphemeCount(graphemes: readonly string[]): number;
export declare function smoothStreamingRevealCount({ backlog, elapsedMs, inputDone, }: {
    backlog: number;
    elapsedMs: number;
    inputDone?: boolean;
}): number;
export declare function smoothStreamingPunctuationDelayMs(grapheme: string | undefined, backlog: number): number;
//# sourceMappingURL=streaming-text-smoothing.d.ts.map