import React from 'react' ; export type PortalMethods = { mount : ( name : string , children : React . ReactNode ) => number ; update : ( name : string , key : number , children : React . ReactNode ) => void ; unmount : ( name : string , key : number ) => void ; } ; export function createPortalContext ( name ) { const PortalContext = React . createContext < PortalMethods | null > ( null ) ; PortalContext . displayName = 'PortalContext-' + name ; return PortalContext ; }