import { ViewToken, ViewabilityConfig } from "react-native";
export declare const useHasSeenItem: <T>({ keyExtractor }: {
    keyExtractor: (item: T) => string;
}) => {
    onViewableItemsChanged: ({ viewableItems }: {
        viewableItems: ViewToken[];
        changed: ViewToken[];
    }) => void;
    viewabilityConfig: ViewabilityConfig;
    hasSeenItem: (item: T) => boolean;
    viewedItems: Set<string>;
};