const { default: pgr } = require('@simonsinclair/pgr');

const ARTICLES_PER_PAGE = 20;
const PAGINATION_LENGTH = 7;

const articles = [
  { title: 'Article 1' },
  { title: 'Article 2' },
  // ...
];

const totalPages = Math.ceil(articles.length / ARTICLES_PER_PAGE);
const currentPage = 5;

const pagination = pgr(totalPages, currentPage, PAGINATION_LENGTH);

console.log(pagination);

[2, 3, 4, 5, 6, 7, 8];

<ol>
  {pgr(totalPages, currentPage, PAGINATION_LENGTH, (pageNum) => (
    <li key={pageNum}>
      <button>{pageNum}</button>
    </li>
  ))}
</ol>