export declare const HEIGHT_ANIMATION_PROPERTY = "grid-template-rows";
/**
 * Returns a `transitionend` listener for the typing indicator's
 * height transition. Filters by property name so unrelated
 * transitions on the same element (e.g. opacity) don't trigger the
 * callback.
 * @param onHeightTransitionEnd
 */
export declare function createHeightTransitionEndHandler(onHeightTransitionEnd: () => void): (event: TransitionEvent) => void;
/**
 * Verifies that the passed element actually transitions on the
 * property the height-transition handler filters on. Surfaces SCSS
 * drift loudly instead of silently breaking auto-scroll-on-indicator-
 * appearance.
 * @param element
 */
export declare function verifyHeightAnimationProperty(element: Element | null | undefined): void;
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