From 29cc1392405283a0015aca318b1d06af5757c807 Mon Sep 17 00:00:00 2001
From: Un7corn <sjd77777djs@gmail.com>
Date: Thu, 12 Mar 2026 11:58:33 +0800
Subject: [PATCH 1/4] Create useDarkMode.ts

---
 .../template/src/hooks/useDarkMode.ts         | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 packages/cra-template-typescript/template/src/hooks/useDarkMode.ts

diff --git a/packages/cra-template-typescript/template/src/hooks/useDarkMode.ts b/packages/cra-template-typescript/template/src/hooks/useDarkMode.ts
new file mode 100644
index 00000000000..872b1e4ad54
--- /dev/null
+++ b/packages/cra-template-typescript/template/src/hooks/useDarkMode.ts
@@ -0,0 +1,78 @@
+import { useEffect, useState } from 'react'
+
+type Theme = 'light' | 'dark'
+
+const STORAGE_KEY = 'theme'
+const MEDIA_QUERY = '(prefers-color-scheme: dark)'
+
+function getStoredTheme(): Theme | null {
+  try {
+    const value = window.localStorage.getItem(STORAGE_KEY)
+    return value === 'light' || value === 'dark' ? value : null
+  } catch {
+    return null
+  }
+}
+
+function getSystemTheme(): Theme {
+  return window.matchMedia(MEDIA_QUERY).matches ? 'dark' : 'light'
+}
+
+export function useDarkMode() {
+  const [theme, setThemeState] = useState<Theme>(() => {
+    if (typeof window === 'undefined') {
+      return 'light'
+    }
+
+    return getStoredTheme() ?? getSystemTheme()
+  })
+
+  useEffect(() => {
+    document.documentElement.setAttribute('data-theme', theme)
+
+    try {
+      window.localStorage.setItem(STORAGE_KEY, theme)
+    } catch {
+      // ignore storage errors
+    }
+  }, [theme])
+
+  useEffect(() => {
+    if (typeof window === 'undefined') {
+      return
+    }
+
+    const mediaQuery = window.matchMedia(MEDIA_QUERY)
+
+    const handleChange = (event: MediaQueryListEvent) => {
+      const storedTheme = getStoredTheme()
+
+      if (!storedTheme) {
+        setThemeState(event.matches ? 'dark' : 'light')
+      }
+    }
+
+    if (typeof mediaQuery.addEventListener === 'function') {
+      mediaQuery.addEventListener('change', handleChange)
+      return () => mediaQuery.removeEventListener('change', handleChange)
+    }
+
+    mediaQuery.addListener(handleChange)
+    return () => mediaQuery.removeListener(handleChange)
+  }, [])
+
+  const setTheme = (nextTheme: Theme) => {
+    setThemeState(nextTheme)
+  }
+
+  const toggleTheme = () => {
+    setThemeState(prev => (prev === 'light' ? 'dark' : 'light'))
+  }
+
+  return {
+    theme,
+    isDark: theme === 'dark',
+    setTheme,
+    toggleTheme
+  }
+}

From fec723088cccc1c35c1560df97f7e18ced53c762 Mon Sep 17 00:00:00 2001
From: Un7corn <sjd77777djs@gmail.com>
Date: Thu, 12 Mar 2026 12:28:42 +0800
Subject: [PATCH 2/4] Create uDarkMode.ts

---
 .../template/src/hooks/uDarkMode.ts           | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 packages/cra-template-typescript/template/src/hooks/uDarkMode.ts

diff --git a/packages/cra-template-typescript/template/src/hooks/uDarkMode.ts b/packages/cra-template-typescript/template/src/hooks/uDarkMode.ts
new file mode 100644
index 00000000000..d3d844f6ade
--- /dev/null
+++ b/packages/cra-template-typescript/template/src/hooks/uDarkMode.ts
@@ -0,0 +1,62 @@
+import { useState, useEffect, useCallback } from 'react'
+
+type Theme = 'light' | 'dark'
+
+const STORAGE_KEY = 'theme'
+
+function getInitialTheme(): Theme {
+  const stored = localStorage.getItem(STORAGE_KEY)
+  if (stored === 'light' || stored === 'dark') {
+    return stored
+  }
+
+  if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
+    return 'dark'
+  }
+
+  return 'light'
+}
+
+export function useDarkMode() {
+  const [theme, setThemeState] = useState<Theme>(() => getInitialTheme())
+
+  useEffect(() => {
+    const root = document.documentElement
+    root.setAttribute('data-theme', theme)
+    localStorage.setItem(STORAGE_KEY, theme)
+  }, [theme])
+
+  useEffect(() => {
+    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
+
+    const handleChange = (e: MediaQueryListEvent) => {
+      const stored = localStorage.getItem(STORAGE_KEY)
+      if (!stored) {
+        setThemeState(e.matches ? 'dark' : 'light')
+      }
+    }
+
+    mediaQuery.addEventListener('change', handleChange)
+
+    return () => {
+      mediaQuery.removeEventListener('change', handleChange)
+    }
+  }, [])
+
+  const toggle = useCallback(() => {
+    setThemeState(prev => (prev === 'light' ? 'dark' : 'light'))
+  }, [])
+
+  const setTheme = useCallback((theme: Theme) => {
+    setThemeState(theme)
+  }, [])
+
+  return {
+    theme,
+    isDark: theme === 'dark',
+    toggle,
+    setTheme
+  }
+}
+
+export default useDarkMode

From cad2a6de99b672a875808440b79eaea166bb97f1 Mon Sep 17 00:00:00 2001
From: Un7corn <sjd77777djs@gmail.com>
Date: Thu, 12 Mar 2026 12:29:26 +0800
Subject: [PATCH 3/4] Create Header.tsx

---
 .../template/src/components/Header.tsx        | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 packages/cra-template-typescript/template/src/components/Header.tsx

diff --git a/packages/cra-template-typescript/template/src/components/Header.tsx b/packages/cra-template-typescript/template/src/components/Header.tsx
new file mode 100644
index 00000000000..7e6777e2af7
--- /dev/null
+++ b/packages/cra-template-typescript/template/src/components/Header.tsx
@@ -0,0 +1,36 @@
+import React from 'react'
+import { useDarkMode } from '../hooks/useDarkMode'
+
+const Header: React.FC = () => {
+  const { isDark, toggle } = useDarkMode()
+
+  return (
+    <div
+      style={{
+        position: 'absolute',
+        top: '20px',
+        right: '20px',
+        zIndex: 1000
+      }}
+    >
+      <button
+        onClick={toggle}
+        style={{
+          padding: '10px 20px',
+          fontSize: '16px',
+          cursor: 'pointer',
+          borderRadius: '8px',
+          border: '2px solid #61dafb',
+          backgroundColor: isDark ? '#1a1a1a' : '#ffffff',
+          color: isDark ? '#ffffff' : '#282c34',
+          transition: 'all 0.3s ease'
+        }}
+        aria-label={isDark ? '切换到亮色模式' : '切换到暗色模式'}
+      >
+        {isDark ? '🌙 深色模式' : '☀️ 浅色模式'}
+      </button>
+    </div>
+  )
+}
+
+export default Header

From 5b3959a0af724c395409423f8d4c8c0fa193deea Mon Sep 17 00:00:00 2001
From: Un7corn <sjd77777djs@gmail.com>
Date: Thu, 12 Mar 2026 12:30:02 +0800
Subject: [PATCH 4/4] Update App.tsx

---
 .../cra-template-typescript/template/src/App.tsx  | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/packages/cra-template-typescript/template/src/App.tsx b/packages/cra-template-typescript/template/src/App.tsx
index a53698aab3c..775e7ab4c34 100644
--- a/packages/cra-template-typescript/template/src/App.tsx
+++ b/packages/cra-template-typescript/template/src/App.tsx
@@ -1,15 +1,20 @@
-import React from 'react';
-import logo from './logo.svg';
-import './App.css';
+import React from 'react'
+import logo from './logo.svg'
+import './App.css'
+import Header from './components/Header'
 
 function App() {
   return (
     <div className="App">
+      <Header />
+
       <header className="App-header">
         <img src={logo} className="App-logo" alt="logo" />
+
         <p>
           Edit <code>src/App.tsx</code> and save to reload.
         </p>
+
         <a
           className="App-link"
           href="https://reactjs.org"
@@ -20,7 +25,7 @@ function App() {
         </a>
       </header>
     </div>
-  );
+  )
 }
 
-export default App;
+export default App