[Sheets] [Pt. 1] Root PR (#5557)

Co-authored-by: Samuel Newman <mozzius@protonmail.com>
Co-authored-by: Eric Bailey <git@esb.lol>
Co-authored-by: dan <dan.abramov@gmail.com>
Co-authored-by: Hailey <me@haileyok.com>

src/components/Portal.tsx

@@ -12,6 +12,8 @@ type ComponentMap = {
   [id: string]: Component
 }
 
+export type PortalComponent = ({children}: {children?: React.ReactNode}) => null
+
 export function createPortalGroup() {
   const Context = React.createContext<ContextType>({
     outlet: null,