feat(clerk-js): PortalProvider POC

.changeset/wet-phones-camp.md

@@ -0,0 +1,2 @@
+---
+---

packages/clerk-js/src/ui/elements/Modal.tsx

@@ -1,4 +1,4 @@
-import { createContextAndHook, useSafeLayoutEffect } from '@clerk/shared/react';
+import { createContextAndHook, useSafeLayoutEffect, usePortalRoot } from '@clerk/shared/react';
 import React, { useRef } from 'react';
 
 import { descriptors, Flex } from '../customizables';
@@ -27,6 +27,7 @@ export const Modal = withFloatingTree((props: ModalProps) => {
   const { disableScrollLock, enableScrollLock } = useScrollLock();
   const { handleClose, handleOpen, contentSx, containerSx, canCloseModal, id, style, portalRoot, initialFocusRef } =
     props;
+  const portalRootFromContext = usePortalRoot();
   const overlayRef = useRef<HTMLDivElement>(null);
   const { floating, isOpen, context, nodeId, toggle } = usePopover({
     defaultOpen: true,
@@ -52,13 +53,15 @@ export const Modal = withFloatingTree((props: ModalProps) => {
     };
   }, []);
 
+  const effectivePortalRoot = portalRoot ?? portalRootFromContext ?? undefined;
+
   return (
     <Popover
       nodeId={nodeId}
       context={context}
       isOpen={isOpen}
       outsideElementsInert
-      root={portalRoot}
+      root={effectivePortalRoot}
       initialFocus={initialFocusRef}
     >
       <ModalContext.Provider value={modalCtx}>

packages/clerk-js/src/ui/elements/Popover.tsx

@@ -1,5 +1,6 @@
 import type { FloatingContext, ReferenceType } from '@floating-ui/react';
 import { FloatingFocusManager, FloatingNode, FloatingPortal } from '@floating-ui/react';
+import { usePortalRoot } from '@clerk/shared/react';
 import type { PropsWithChildren } from 'react';
 import React from 'react';
 
@@ -35,10 +36,13 @@ export const Popover = (props: PopoverProps) => {
     children,
   } = props;
 
+  const portalRoot = usePortalRoot();
+  const effectiveRoot = root ?? portalRoot ?? undefined;
+
   if (portal) {
     return (
       <FloatingNode id={nodeId}>
-        <FloatingPortal root={root}>
+        <FloatingPortal root={effectiveRoot}>
           {isOpen && (
             <FloatingFocusManager
               context={context}

packages/nextjs/src/client-boundary/controlComponents.ts

@@ -15,6 +15,7 @@ export {
   AuthenticateWithRedirectCallback,
   RedirectToCreateOrganization,
   RedirectToOrganizationProfile,
+  PortalProvider,
 } from '@clerk/clerk-react';
 
 export { MultisessionAppSupport } from '@clerk/clerk-react/internal';

packages/nextjs/src/index.ts

@@ -8,6 +8,7 @@ export {
   ClerkFailed,
   ClerkLoaded,
   ClerkLoading,
+  PortalProvider,
   RedirectToCreateOrganization,
   RedirectToOrganizationProfile,
   RedirectToSignIn,

packages/react/src/contexts/index.ts

@@ -1 +1,2 @@
 export { ClerkProvider } from './ClerkProvider';
+export { PortalProvider } from '@clerk/shared/react';

packages/shared/src/react/PortalProvider.tsx

@@ -0,0 +1,76 @@
+'use client';
+
+import React, { useEffect, useRef } from 'react';
+
+import { createContextAndHook } from './hooks/createContextAndHook';
+import { portalRootManager } from './portal-root-manager';
+
+type PortalProviderProps = React.PropsWithChildren<{
+  /**
+   * Function that returns the container element where portals should be rendered.
+   * This allows Clerk components to render inside external dialogs/popovers
+   * (e.g., Radix Dialog, React Aria Components) instead of document.body.
+   */
+  getContainer: () => HTMLElement | null;
+}>;
+
+const [PortalContext, , usePortalContextWithoutGuarantee] = createContextAndHook<{
+  getContainer: () => HTMLElement | null;
+}>('PortalProvider');
+
+/**
+ * PortalProvider allows you to specify a custom container for all Clerk floating UI elements
+ * (popovers, modals, tooltips, etc.) that use portals.
+ *
+ * This is particularly useful when using Clerk components inside external UI libraries
+ * like Radix Dialog or React Aria Components, where portaled elements need to render
+ * within the dialog's container to remain interactable.
+ *
+ * @example
+ * ```tsx
+ * function Example() {
+ *   const containerRef = useRef(null);
+ *   return (
+ *     <RadixDialog ref={containerRef}>
+ *       <PortalProvider getContainer={() => containerRef.current}>
+ *         <UserButton />
+ *       </PortalProvider>
+ *     </RadixDialog>
+ *   );
+ * }
+ * ```
+ */
+export const PortalProvider = ({ children, getContainer }: PortalProviderProps) => {
+  const getContainerRef = useRef(getContainer);
+  getContainerRef.current = getContainer;
+
+  // Register with the manager for cross-tree access (e.g., modals in Components.tsx)
+  useEffect(() => {
+    const getContainerWrapper = () => getContainerRef.current();
+    portalRootManager.push(getContainerWrapper);
+    return () => {
+      portalRootManager.pop();
+    };
+  }, []);
+
+  // Provide context for same-tree access (e.g., UserButton popover)
+  const contextValue = React.useMemo(() => ({ value: { getContainer } }), [getContainer]);
+
+  return <PortalContext.Provider value={contextValue}>{children}</PortalContext.Provider>;
+};
+
+/**
+ * Hook to get the current portal root container.
+ * First checks React context (for same-tree components),
+ * then falls back to PortalRootManager (for cross-tree like modals).
+ */
+export const usePortalRoot = (): HTMLElement | null => {
+  // Try to get from context first (for components in the same React tree)
+  const contextValue = usePortalContextWithoutGuarantee();
+  if (contextValue && 'getContainer' in contextValue) {
+    return contextValue.getContainer();
+  }
+
+  // Fall back to manager (for components in different React trees, like modals)
+  return portalRootManager.getCurrent();
+};

packages/shared/src/react/index.ts

@@ -20,3 +20,5 @@ export {
 } from './contexts';
 
 export * from './billing/payment-element';
+
+export { PortalProvider, usePortalRoot } from './PortalProvider';

packages/shared/src/react/portal-root-manager.ts

@@ -0,0 +1,37 @@
+/**
+ * PortalRootManager manages a stack of portal root containers.
+ * This allows PortalProvider to work across separate React trees
+ * (e.g., when Clerk modals are rendered in a different tree via Components.tsx).
+ */
+class PortalRootManager {
+  private stack: Array<() => HTMLElement | null> = [];
+
+  /**
+   * Push a new portal root getter onto the stack.
+   * @param getContainer Function that returns the container element
+   */
+  push(getContainer: () => HTMLElement | null): void {
+    this.stack.push(getContainer);
+  }
+
+  /**
+   * Pop the most recent portal root from the stack.
+   */
+  pop(): void {
+    this.stack.pop();
+  }
+
+  /**
+   * Get the current (topmost) portal root container.
+   * @returns The container element or null if no provider is active
+   */
+  getCurrent(): HTMLElement | null {
+    if (this.stack.length === 0) {
+      return null;
+    }
+    const getContainer = this.stack[this.stack.length - 1];
+    return getContainer();
+  }
+}
+
+export const portalRootManager = new PortalRootManager();