import { type ReactNode } from 'react';
type Props = {
    suspenseFallback?: boolean;
    children: ReactNode;
};
export declare function supportsActivity(): boolean;
/**
 * Uses React.Activity if available, otherwise falls back to
 * Suspense (when suspenseFallback is true) or Fragment (when false).
 */
export declare function ActivityOrFallback({ suspenseFallback, children }: Props): ReactNode;
export {};
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