import { ReactElement } from "react";
export declare function LazyFlatlist<T>(props: {
    keyExtractor: (item: T) => string;
    children: (props: {
        viewedItems: Set<string>;
        viewabilityConfig: any;
        onViewableItemsChanged: any;
        hasSeenItem: (item: T) => boolean;
    }) => React.ReactNode | null | undefined;
}): ReactElement;