themes/next/components/CategoryGroup.js

import { siteConfig } from '@/lib/config'
import Link from 'next/link'

const CategoryGroup = ({ currentCategory, categories }) => {
  if (!categories || categories.length === 0) return <></>
  const categoryCount = siteConfig('PREVIEW_CATEGORY_COUNT')
  const categoryOptions = categories.slice(0, categoryCount)
  return <>
    <div id='category-list' className='dark:border-gray-600 flex flex-wrap'>
      {categoryOptions.map(category => {
        const selected = currentCategory === category.name
        return (
          <Link
            key={category.name}
            href={`/category/${category.name}`}
            passHref
            className={(selected
              ? 'hover:text-white dark:hover:text-white bg-gray-600 text-white '
              : 'dark:text-gray-400 text-gray-500 hover:text-white hover:bg-gray-500 dark:hover:text-white') +
              '  text-sm w-full items-center duration-300 px-2  cursor-pointer py-1 font-light'}>

            <i className={`${selected ? 'text-white fa-folder-open ' : 'text-gray-500 fa-folder '} mr-2 fas`} />{category.name}({category.count})
          </Link>
        );
      })}
    </div>
  </>;
}

export default CategoryGroup