init

src/shared-theme/ColorModeSelect.tsx

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+import * as React from 'react';
+import { useColorScheme } from '@mui/material/styles';
+import MenuItem from '@mui/material/MenuItem';
+import Select, { SelectProps } from '@mui/material/Select';
+
+export default function ColorModeSelect(props: SelectProps) {
+  const { mode, setMode } = useColorScheme();
+  if (!mode) {
+    return null;
+  }
+  return (
+    <Select
+      value={mode}
+      onChange={(event) =>
+        setMode(event.target.value as 'system' | 'light' | 'dark')
+      }
+      SelectDisplayProps={{
+        // @ts-ignore
+        'data-screenshot': 'toggle-mode',
+      }}
+      {...props}
+    >
+      <MenuItem value="system">System</MenuItem>
+      <MenuItem value="light">Light</MenuItem>
+      <MenuItem value="dark">Dark</MenuItem>
+    </Select>
+  );
+}