fix: fix click outside within Shadow DOM

package.json

@@ -38,6 +38,7 @@
     "@rollup/plugin-typescript": "^11.1.6",
     "@testing-library/dom": "^10.4.0",
     "@testing-library/react": "^16.0.0",
+    "@testing-library/user-event": "14.5.2",
     "@types/eslint": "^8.56.10",
     "@types/jest": "^29.5.12",
     "@types/node": "22",

src/click_outside_wrapper.tsx

@@ -20,12 +20,19 @@
   onClickOutsideRef.current = onClickOutside;
   const handleClickOutside = useCallback(
     (event: MouseEvent) => {
-      if (ref.current && !ref.current.contains(event.target as Node)) {
+      const target =
+        (event.composed &&
+          event.composedPath &&
+          event
+            .composedPath()
+            .find((eventTarget) => eventTarget instanceof Node)) ||
+        event.target;
+      if (ref.current && !ref.current.contains(target as Node)) {
         if (
           !(
             ignoreClass &&
-            event.target instanceof HTMLElement &&
-            event.target.classList.contains(ignoreClass)
+            target instanceof HTMLElement &&
+            target.classList.contains(ignoreClass)
           )
         ) {
           onClickOutsideRef.current?.(event);

src/test/datepicker_test.test.tsx

@@ -1,4 +1,5 @@
 import { render, act, waitFor, fireEvent } from "@testing-library/react";
+import { userEvent } from "@testing-library/user-event";
 import { enUS, enGB } from "date-fns/locale";
 import React from "react";
 
@@ -26,6 +27,7 @@ import {
 import DatePicker, { registerLocale } from "../index";
 
 import CustomInput from "./helper_components/custom_input";
+import ShadowRoot from "./helper_components/shadow_root";
 import TestWrapper from "./helper_components/test_wrapper";
 import { getKey, safeQuerySelector } from "./test_utils";
 
@@ -196,6 +198,33 @@ describe("DatePicker", () => {
     expect(shadow.getElementById("test-portal")).toBeDefined();
   });
 
+  it("calendar should stay open when clicked within shadow dom and closed when clicked outside", async () => {
+    let instance: DatePicker | null = null;
+    render(
+      <ShadowRoot>
+        <DatePicker
+          ref={(node) => {
+            instance = node;
+          }}
+        />
+      </ShadowRoot>,
+    );
+
+    expect(instance).toBeTruthy();
+    expect(instance!.input).toBeTruthy();
+
+    await userEvent.click(instance!.input!);
+    expect(instance!.isCalendarOpen()).toBe(true);
+    expect(instance!.calendar).toBeTruthy();
+    expect(instance!.calendar!.containerRef.current).toBeTruthy();
+
+    await userEvent.click(instance!.calendar!.containerRef.current!);
+    expect(instance!.isCalendarOpen()).toBe(true);
+
+    await userEvent.click(document.body);
+    expect(instance!.isCalendarOpen()).toBe(false);
+  });
+
   it("should not set open state when it is disabled and gets clicked", () => {
     const { container } = render(<DatePicker disabled />);
 

src/test/helper_components/shadow_root.tsx

@@ -0,0 +1,35 @@
+import React, {
+  type FC,
+  type PropsWithChildren,
+  useLayoutEffect,
+  useRef,
+  useState,
+} from "react";
+import { createPortal } from "react-dom";
+
+const ShadowRoot: FC<PropsWithChildren> = ({ children }) => {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const shadowRootRef = useRef<ShadowRoot>(null);
+  const [isInitialized, setIsInitialized] = useState(false);
+
+  useLayoutEffect(() => {
+    const container = containerRef.current;
+    if (isInitialized || !container) {
+      return;
+    }
+
+    shadowRootRef.current =
+      container.shadowRoot ?? container.attachShadow({ mode: "open" });
+    setIsInitialized(true);
+  }, [isInitialized]);
+
+  return (
+    <div ref={containerRef}>
+      {isInitialized &&
+        shadowRootRef.current &&
+        createPortal(children, shadowRootRef.current)}
+    </div>
+  );
+};
+
+export default ShadowRoot;