fix: Proper async handling for portals

src/internal/portal/__tests__/portal.test.tsx

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 import React, { useState } from 'react';
-import { act, fireEvent, render, screen } from '@testing-library/react';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 
 import { warnOnce } from '../../logging';
 import Portal, { PortalProps } from '../index';
@@ -108,6 +108,30 @@ describe('Portal', () => {
       expect(document.body.contains(container)).toBe(false);
     });
 
+    test('should support aborting async container setup', async () => {
+      const container = document.createElement('div');
+      const onAbort = jest.fn();
+      const onContinue = jest.fn();
+      const getContainer: PortalProps['getContainer'] = async ({ abortSignal }) => {
+        abortSignal.addEventListener('abort', onAbort);
+        await Promise.resolve();
+        onContinue(abortSignal.aborted);
+        return container;
+      };
+      const removeContainer = jest.fn();
+      const { unmount } = renderPortal({
+        children: <p data-testid="portal-content">Hello!</p>,
+        getContainer,
+        removeContainer,
+      });
+      unmount();
+      await waitFor(() => {
+        expect(onContinue).not.toHaveBeenCalled();
+        expect(onAbort).toHaveBeenCalled();
+        expect(removeContainer).toHaveBeenCalledWith(null);
+      });
+    });
+
     test('allows conditional change of getContainer/removeContainer', async () => {
       function MovablePortal({ getContainer, removeContainer }: Pick<PortalProps, 'getContainer' | 'removeContainer'>) {
         const [visible, setVisible] = useState(false);

src/internal/portal/index.tsx

@@ -8,8 +8,8 @@ import { warnOnce } from '../logging';
 
 export interface PortalProps {
   container?: null | Element;
-  getContainer?: () => Promise<HTMLElement>;
-  removeContainer?: (container: HTMLElement) => void;
+  getContainer?: (options: { abortSignal: AbortSignal }) => Promise<HTMLElement>;
+  removeContainer?: (container: HTMLElement | null) => void;
   children: React.ReactNode;
 }
 
@@ -23,13 +23,17 @@ function manageDefaultContainer(setState: React.Dispatch<React.SetStateAction<El
 }
 
 function manageAsyncContainer(
-  getContainer: () => Promise<HTMLElement>,
-  removeContainer: (container: HTMLElement) => void,
+  getContainer: (options: { abortSignal: AbortSignal }) => Promise<HTMLElement>,
+  removeContainer: (container: HTMLElement | null) => void,
   setState: React.Dispatch<React.SetStateAction<Element | null>>
 ) {
-  let newContainer: HTMLElement;
-  getContainer().then(
+  let newContainer: HTMLElement | null = null;
+  const abortController = new AbortController();
+  getContainer({ abortSignal: abortController.signal }).then(
     container => {
+      if (abortController.signal.aborted) {
+        return;
+      }
       newContainer = container;
       setState(container);
     },
@@ -38,6 +42,7 @@ function manageAsyncContainer(
     }
   );
   return () => {
+    abortController.abort();
     removeContainer(newContainer);
   };
 }