import type { ToolRegistry } from "./registry.js";
import type { ActivityItem } from "./types.js";
/** One stable viewport; updates replace its content without moving the conversation. */
export declare function RollingActivity({ items, toolRegistry, previousItem, showCount, }: {
    items: ActivityItem[];
    /** The standalone item visible immediately before this reel mounted. */
    previousItem?: ActivityItem | undefined;
    toolRegistry?: ToolRegistry;
    /** Show "+N earlier"; off when an enclosing status line already counts steps. */
    showCount?: boolean;
}): import("react").JSX.Element | null;