fix(/src/lib/components/Flowbite): fix window is not defined in `ne…

…xt.js` (#652)

Thanks @fsioni --

* fix(themecontext): fixing `ReferenceError: window is not defined error with Next.js

The variable `userPreferenceIsDark` was initialized with a value from the window object. This was causing an error with Next because of SSR. I added the check of the window, if it's on the server side, set to white

* fix(themecontext): fixing `ReferenceError: window is not defined` error with Next.js

The variable`userPreferenceIsDark` was initialized with a value from the window object. This was
causing an error with Next because of SSR. I added the check of the window, if it's on the server
side the value is set to `false`

src/lib/components/Flowbite/ThemeContext.tsx

@@ -31,7 +31,7 @@ export function useTheme(): ThemeContextProps {
 }
 
 export const useThemeMode = (): [Mode, React.Dispatch<React.SetStateAction<Mode>>, () => void] => {
-  const userPreferenceIsDark = () => window.matchMedia?.('(prefers-color-scheme: dark)').matches;
+  const userPreferenceIsDark = () => windowExists() && window.matchMedia?.('(prefers-color-scheme: dark)').matches;
   const getPrefersColorScheme = (): Mode => (userPreferenceIsDark() ? 'dark' : 'light');
   const onToggleMode = () => {
     const newMode = mode === 'dark' ? 'light' : 'dark';