From 1268bd286e9847c0b3df3adef6e5a4f3a83a78fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=B3=E5=BB=B7=E5=AE=89?=
 <73953029+nrps9909@users.noreply.github.com>
Date: Fri, 28 Aug 2026 16:06:21 +0800
Subject: [PATCH] fix: resize uncontrolled textarea values

---
 src/ResizableTextArea.tsx        |  2 +-
 tests/ResizableTextArea.test.tsx | 19 ++++++++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/ResizableTextArea.tsx b/src/ResizableTextArea.tsx
index 23f27d8..7420007 100644
--- a/src/ResizableTextArea.tsx
+++ b/src/ResizableTextArea.tsx
@@ -86,7 +86,7 @@ const ResizableTextArea = React.forwardRef<ResizableTextAreaRef, TextAreaProps>(
       if (needAutoSize) {
         startResize();
       }
-    }, [value, minRows, maxRows, needAutoSize]);
+    }, [mergedValue, minRows, maxRows, needAutoSize]);
 
     useLayoutEffect(() => {
       if (resizeState === RESIZE_START) {
diff --git a/tests/ResizableTextArea.test.tsx b/tests/ResizableTextArea.test.tsx
index 60b462d..f11b91e 100644
--- a/tests/ResizableTextArea.test.tsx
+++ b/tests/ResizableTextArea.test.tsx
@@ -1,4 +1,4 @@
-import { render } from '@testing-library/react';
+import { fireEvent, render } from '@testing-library/react';
 import React from 'react';
 import type { ResizableTextAreaRef, TextAreaProps } from '../src';
 import { ResizableTextArea } from '../src';
@@ -21,3 +21,20 @@ it('should have no onPressEnter prop', () => {
   render(<ResizableTextArea defaultValue="test" />);
   expect(resizableTextAreaProps().onPressEnter).toBeUndefined();
 });
+
+it('should resize when an uncontrolled value changes', () => {
+  const onInternalAutoSize = jest.fn();
+  const props = {
+    autoSize: true,
+    defaultValue: 'test',
+    onInternalAutoSize,
+  } as TextAreaProps & { onInternalAutoSize: VoidFunction };
+  const { container } = render(<ResizableTextArea {...props} />);
+
+  onInternalAutoSize.mockClear();
+  fireEvent.change(container.querySelector('textarea'), {
+    target: { value: 'a longer uncontrolled value' },
+  });
+
+  expect(onInternalAutoSize).toHaveBeenCalledTimes(1);
+});