NotionNext/themes/NEXT/components/CategoryGroup.js

import Link from 'next/link'
import React from 'react'

const CategoryGroup = ({ currentCategory, categories }) => {
  if (!categories) return <></>
  return <>
    <div id='category-list' className='dark:border-gray-600 flex flex-wrap'>
      {categories.map(category => {
        const selected = currentCategory === category.name
        return <Link key={category.name} href={`/category/${category.name}`} passHref>
          <a className={(selected
            ? 'hover:text-white dark:hover:text-white bg-gray-600 text-white '
            : 'dark:text-gray-400 text-gray-500 hover:text-white hover:bg-gray-500 dark:hover:text-white') +
            '  text-sm w-full items-center duration-300 px-2  cursor-pointer py-1 font-light'}>
            <i className={`${selected ? 'text-white fa-folder-open ' : 'text-gray-400 fa-folder '} mr-2 fas`} />{category.name}({category.count})
            </a>
        </Link>
      })}
    </div>
  </>
}

export default CategoryGroup