createPortal impl on web for Portal

src/components/Portal.web.tsx

@@ -0,0 +1,35 @@
+import React, {useContext, useId} from 'react'
+import {createPortal} from 'react-dom'
+
+export function createPortalGroup() {
+  const Context = React.createContext<string | null>(null)
+
+  function Provider(props: React.PropsWithChildren<{}>) {
+    const id = useId()
+    return <Context.Provider value={id}>{props.children}</Context.Provider>
+  }
+
+  function Outlet() {
+    const id = useContext(Context)
+    if (!id) throw new Error('Outlet must be used within a Portal Provider')
+    return <div id={id} />
+  }
+
+  function Portal({children}: React.PropsWithChildren<{}>) {
+    const id = useContext(Context)
+    if (!id) throw new Error('Portal must be used within a Portal Provider')
+    const elem = document.getElementById(id)
+    if (!elem) {
+      console.error('Portal element not found', id)
+      return null
+    }
+    return createPortal(children, elem)
+  }
+
+  return {Provider, Outlet, Portal}
+}
+
+const DefaultPortal = createPortalGroup()
+export const Provider = DefaultPortal.Provider
+export const Outlet = DefaultPortal.Outlet
+export const Portal = DefaultPortal.Portal