/// <reference types="react" />
export declare const viewportStartContext: {
    useState: () => number;
    useRef: () => {
        readonly current: number;
    };
    useSetter: () => (action: import("react").SetStateAction<number>) => void;
    Provider: ({ children }: {
        children: import("react").ReactNode;
    }) => JSX.Element;
};
export declare const viewportSizeContext: {
    useState: () => number;
    useRef: () => {
        readonly current: number;
    };
    useSetter: () => (action: import("react").SetStateAction<number>) => void;
    Provider: ({ children }: {
        children: import("react").ReactNode;
    }) => JSX.Element;
};