Reactive color mode in React using hooks

use-color-mode.hooks.tsx

import { useEffect } from 'react';
import useLocalStorage from './use-local-storage.hooks';

const useColorMode = () => {
  const [colorMode, setColorMode] = useLocalStorage('color-theme', 'light');

  useEffect(() => {
    const className = 'dark';
    const bodyClass = window.document.body.classList;

    colorMode === 'dark'
      ? bodyClass.add(className)
      : bodyClass.remove(className);
  }, [colorMode]);

  return [colorMode, setColorMode];
};

export default useColorMode;

use-local-storage.hooks.tsx

import { useEffect, useState } from 'react';

type SetValue<T> = T | ((val: T) => T);

function useLocalStorage<T>(
  key: string,
  initialValue: T
): [T, (value: SetValue<T>) => void] {
  // State to store our value
  // Pass  initial state function to useState so logic is only executed once
  const [storedValue, setStoredValue] = useState(() => {
    try {
      // Get from local storage by key
      const item = window.localStorage.getItem(key);
      // Parse stored json or if none return initialValue
      return item ? JSON.parse(item) : initialValue;
    } catch (error) {
      // If error also return initialValue
      console.log(error);
      return initialValue;
    }
  });

  // useEffect to update local storage when the state changes
  useEffect(() => {
    try {
      // Allow value to be a function so we have same API as useState
      const valueToStore =
        typeof storedValue === 'function'
          ? storedValue(storedValue)
          : storedValue;
      // Save state
      window.localStorage.setItem(key, JSON.stringify(valueToStore));
    } catch (error) {
      // A more advanced implementation would handle the error case
      console.log(error);
    }
  }, [key, storedValue]);

  return [storedValue, setStoredValue];
}

export default useLocalStorage;

Usage:

const [colorMode, setColorMode] = useColorMode();

....
if (typeof setColorMode === 'function') {
              setColorMode(colorMode === 'light' ? 'dark' : 'light');
            }
...
    colorMode === 'dark' ? 'bg-primary' : 'bg-stroke'