fix(fuselage-toastbar): React 18 compatibility

.changeset/many-monkeys-deliver.md

@@ -0,0 +1,7 @@
+---
+'@rocket.chat/fuselage-toastbar': patch
+---
+
+Enable compatibility with React 18
+
+React 18's Strict Mode fires effects twice, which breaks Fuselage's toast bar portal.

packages/fuselage-toastbar/src/ToastBar.stories.tsx

@@ -53,85 +53,51 @@ export const Default: StoryFn = () => {
   );
 };
 
-export const TopStart: StoryFn = () => {
+const Template: StoryFn<{
+  position: 'top-start' | 'top-end' | 'bottom-start' | 'bottom-end';
+}> = ({ position }) => {
   const dispatchToastMessage = useToastBarDispatch();
 
-  const handleDispatch = () =>
-    dispatchToastMessage({
-      type: 'success',
-      message: DEFAULT_MESSAGE,
-      position: 'top-start',
-    });
-
   useEffect(() => {
-    handleDispatch();
-  }, []);
-
-  return (
-    <Button primary onClick={handleDispatch}>
-      Dispatch ToastBar
-    </Button>
-  );
-};
-
-export const TopEnd: StoryFn = () => {
-  const dispatchToastMessage = useToastBarDispatch();
-
-  const handleDispatch = () =>
     dispatchToastMessage({
       type: 'success',
       message: DEFAULT_MESSAGE,
+      position,
     });
-
-  useEffect(() => {
-    handleDispatch();
-  }, []);
+  }, [dispatchToastMessage, position]);
 
   return (
-    <Button primary onClick={handleDispatch}>
+    <Button
+      primary
+      onClick={() =>
+        dispatchToastMessage({
+          type: 'success',
+          message: DEFAULT_MESSAGE,
+          position,
+        })
+      }
+    >
       Dispatch ToastBar
     </Button>
   );
 };
 
-export const BottomStart: StoryFn = () => {
-  const dispatchToastMessage = useToastBarDispatch();
-
-  const handleDispatch = () =>
-    dispatchToastMessage({
-      type: 'success',
-      message: DEFAULT_MESSAGE,
-      position: 'bottom-start',
-    });
-
-  useEffect(() => {
-    handleDispatch();
-  }, []);
-
-  return (
-    <Button primary onClick={handleDispatch}>
-      Dispatch ToastBar
-    </Button>
-  );
+export const TopStart = Template.bind({});
+TopStart.args = {
+  position: 'top-start',
 };
 
-export const BottomEnd: StoryFn = () => {
-  const dispatchToastMessage = useToastBarDispatch();
-
-  const handleDispatch = () =>
-    dispatchToastMessage({
-      type: 'success',
-      message: DEFAULT_MESSAGE,
-      position: 'bottom-end',
-    });
+export const TopEnd = Template.bind({});
+TopEnd.args = {
+  position: 'top-end',
+};
 
-  useEffect(() => {
-    handleDispatch();
-  }, []);
+export const BottomStart = Template.bind({});
+BottomStart.args = {
+  position: 'bottom-start',
+};
 
-  return (
-    <Button primary onClick={handleDispatch}>
-      Dispatch ToastBar
-    </Button>
-  );
+export const BottomEnd = Template.bind({});
+BottomEnd.args = {
+  position: 'bottom-end',
 };

packages/fuselage-toastbar/src/ToastBarPortal.ts

@@ -1,17 +1,62 @@
 import type { ReactElement, ReactNode } from 'react';
-import { memo, useEffect, useState } from 'react';
+import { memo, useLayoutEffect } from 'react';
 import { createPortal } from 'react-dom';
 
-import { createAnchor } from './lib/utils/createAnchor';
-import { deleteAnchor } from './lib/utils/deleteAnchor';
+const ensureAnchorElement = (id: string): HTMLElement => {
+  const existingAnchor = document.getElementById(id);
+  if (existingAnchor) return existingAnchor;
+
+  const newAnchor = document.createElement('div');
+  newAnchor.id = id;
+  document.body.appendChild(newAnchor);
+  return newAnchor;
+};
+
+const getAnchorRefCount = (anchorElement: HTMLElement): number => {
+  const { refCount } = anchorElement.dataset;
+  if (refCount) return parseInt(refCount, 10);
+  return 0;
+};
+
+const setAnchorRefCount = (
+  anchorElement: HTMLElement,
+  refCount: number,
+): void => {
+  anchorElement.dataset.refCount = String(refCount);
+};
+
+const refAnchorElement = (anchorElement: HTMLElement): void => {
+  setAnchorRefCount(anchorElement, getAnchorRefCount(anchorElement) + 1);
+
+  if (anchorElement.parentElement !== document.body) {
+    document.body.appendChild(anchorElement);
+  }
+};
+
+const unrefAnchorElement = (anchorElement: HTMLElement): void => {
+  const refCount = getAnchorRefCount(anchorElement) - 1;
+  setAnchorRefCount(anchorElement, refCount);
+
+  if (refCount <= 0) {
+    document.body.removeChild(anchorElement);
+  }
+};
 
 type ToastBarPortalProps = {
   children?: ReactNode;
 };
 
 const ToastBarPortal = ({ children }: ToastBarPortalProps): ReactElement => {
-  const [toastBarRoot] = useState(() => createAnchor('toastBarRoot'));
-  useEffect(() => (): void => deleteAnchor(toastBarRoot), [toastBarRoot]);
+  const toastBarRoot = ensureAnchorElement('toastBarRoot');
+
+  useLayoutEffect(() => {
+    refAnchorElement(toastBarRoot);
+
+    return () => {
+      unrefAnchorElement(toastBarRoot);
+    };
+  }, [toastBarRoot]);
+
   return createPortal(children, toastBarRoot);
 };