import React from "react";
export declare function fillRef<T>(ref: React.Ref<T>, node: T): void;
export declare function composeRef<T>(...refs: React.Ref<T>[]): React.Ref<T>;
export declare function isString(value: any): boolean;
export declare function isNumber(value: any): boolean;
export declare function controlScrollSpeed(node: HTMLElement, scrollPosition: number, innerNodeHeight?: number, prvePageCallBack?: () => void, nextPageCallBack?: () => void, pageOffsetNumber?: number, isPage?: boolean, pass?: boolean): number;