interface UseTypewriterOptions {
    /** Characters revealed per second (default: `500`). */
    speed?: number;
    /** When true, reveal the full text immediately (and snap to it if it grows). */
    skipAnimation?: boolean;
}
interface UseTypewriterResult {
    /** The portion of `fullText` revealed so far. */
    displayedText: string;
    /** `true` while characters are still being revealed. */
    isTyping: boolean;
}
/**
 * Reveals a string character-by-character at a steady rate via
 * `requestAnimationFrame`. Designed for bursty, streamed agent text: as
 * `fullText` grows the reveal keeps chasing the new end, and flipping
 * `skipAnimation` to `true` (e.g. once generation finishes) snaps to the full
 * text. Pair it with `ChatAgentMessage`.
 *
 * @example
 * ```tsx
 * const { displayedText, isTyping } = useTypewriter(message)
 * return (
 *   <ChatAgentMessage>
 *     <Markdown>{displayedText}</Markdown>
 *     {isTyping ? <Cursor /> : null}
 *   </ChatAgentMessage>
 * )
 * ```
 */
export declare function useTypewriter(fullText: string, options?: UseTypewriterOptions): UseTypewriterResult;
export {};