export declare const ANIMATION_DURATION_MS = 200;
/**
 * Hook to animate a text word by word.
 * @param text - the full text content to be animated.
 * @param reduceMotion - whether to reduce motion and disable animations.
 * @param responseState - the current state of the response ('static', 'streaming', 'complete').
 * @param onAnimationStateChange - optional callback fired when animation starts or finishes
 *   (including the CSS fade-in settling time of the last word).
 * @returns the portion of text that can already be rendered and a boolean indicating whether the text is still animating.
 * @internal
 */
export declare const useTextAnimation: (text: string, reduceMotion: boolean, responseState: "static" | "streaming" | "complete", onAnimationStateChange?: (isAnimating: boolean) => void) => {
    displayedText: string;
    isTextAnimating: boolean;
};