import React from "react" ; export type BacklinkContextType = React . RefObject < HTMLDivElement > ; export const BacklinkContext = React . createContext < BacklinkContextType | undefined > ( undefined ) ; BacklinkContext . displayName = "BacklinkContext" ; export const useBacklink = ( ) => { const ctx = React . useContext ( BacklinkContext ) ; if ( ctx === undefined ) { throw new Error ( "useBacklink must be used within a BacklinkContext" ) ; } return ctx ; } ; export const BacklinkProvider = ( { children } ) => { const anchor = React . useRef < HTMLDivElement | null > ( null ) ; return ( < BacklinkContext . Provider value = { anchor } > { children } < /BacklinkContext.Provider>); } ;