@frontkom/gutenberg-js/src/js/init/api-fetch.js

gutenberg-js - An extension of the Wordpress Gutenberg editor

import apiFetch from '@wordpress/api-fetch/build-module';

if (window.wp.apiFetch) {
  const props = Object.keys(apiFetch);

  props.forEach(prop => {
    window.wp.apiFetch[prop] = window.wp.apiFetch[prop] || apiFetch[prop];
  });
}
else {
  window.wp.apiFetch = apiFetch;
}