Get the development version of react in WordPress without needing a dev version of WP

wp-react-dev.php

<?php
/**
 * Enable dev mode vendor packages.
 */

if ( ! defined( 'SCRIPT_DEBUG' ) || ! SCRIPT_DEBUG ) {
	return;
}

add_action( 'init', function () {
	$scripts = wp_scripts();

	$vendor_scripts = array(
		'react' => array( 'wp-polyfill' ),
		'react-dom' => array( 'react' ),
		'moment',
		'lodash',
		'wp-polyfill-fetch',
		'wp-polyfill-formdata',
		'wp-polyfill-node-contains',
		'wp-polyfill-element-closest',
		'wp-polyfill',
	);

	$vendor_scripts_versions = array(
		'react' => '16.6.3',
		'react-dom' => '16.6.3',
		'moment' => '2.22.2',
		'lodash' => '4.17.11',
		'wp-polyfill-fetch' => '3.0.0',
		'wp-polyfill-formdata' => '3.0.12',
		'wp-polyfill-node-contains' => '3.26.0-0',
		'wp-polyfill-element-closest' => '2.0.2',
		'wp-polyfill' => '7.0.0',
	);

	foreach ( $vendor_scripts as $handle => $dependencies ) {
		if ( is_string( $dependencies ) ) {
			$handle = $dependencies;
			$dependencies = array();
		}

		$path = "/wp-includes/js/dist/vendor/$handle.js";
		$version = $vendor_scripts_versions[ $handle ];

		$scripts->remove( $handle );
		$scripts->add( $handle, $path, $dependencies, $version, 1 );
	}

	return;
}, 11 );