Allow BodyPortals to accept ref parameter

src/components/BodyPortal.tsx

@@ -22,18 +22,25 @@ const getInsertBeforeTarget = (bodyPortalSlots: string[], slot?: string) => {
 }
 
 export const BodyPortal = ({
-  children, className, role, slot, tagName
-}: React.PropsWithChildren<{className?: string; role?: string; slot?: string; tagName?: string}>) => {
+  children, className, ref, role, slot, tagName
+}: React.PropsWithChildren<{
+  className?: string;
+  ref?: React.MutableRefObject<HTMLElement | null>;
+  role?: string;
+  slot?: string;
+  tagName?: string
+}>) => {
   const tag = tagName?.toUpperCase() ?? 'DIV';
-  const ref = React.useRef<HTMLElement>(document.createElement(tag));
-  if (ref.current.tagName !== tag) {
-    ref.current = document.createElement(tag);
+  const internalRef = React.useRef<HTMLElement>(document.createElement(tag));
+  if (internalRef.current.tagName !== tag) {
+    internalRef.current = document.createElement(tag);
   }
+  if (ref) { ref.current = internalRef.current; }
 
   const bodyPortalOrderedRefs = React.useContext(BodyPortalSlotsContext);
 
   React.useLayoutEffect(() => {
-    const element = ref.current;
+    const element = internalRef.current;
 
     if (className) { element.classList.add(...className.split(' ')); }
 
@@ -56,5 +63,5 @@ export const BodyPortal = ({
     };
   }, [bodyPortalOrderedRefs, className, role, slot, tag]);
 
-  return createPortal(children, ref.current);
+  return createPortal(children, internalRef.current);
 };