const { gutenbergToReact } = require('@threemammals/gutenberg-to-react');

// example of Wordpress Gutenberg post_content from the post object
const input = '<!-- wp:paragraph -->\n<p>text <br></p>\n<!-- /wp:paragraph -->';

// parse to ReactJs tree
const result = gutenbergToReact(input);

// check out your ReactJs tree?!?!?
console.log(result);
[
  {
    type: 'core/paragraph',
    ref: null,
    '$$typeof': Symbol(react.element),
    props: { style: {}, className: null, children: [Array] }
  }
]