Source

File: wp-includes/script-loader.php

function wp_default_packages_vendor( $scripts ) {
	global $wp_locale;

	$suffix = wp_scripts_get_suffix();

	$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-url',
		'wp-polyfill-dom-rect',
		'wp-polyfill-element-closest',
		'wp-polyfill',
	);

	$vendor_scripts_versions = array(
		'react'                       => '16.9.0',
		'react-dom'                   => '16.9.0',
		'moment'                      => '2.26.0',
		'lodash'                      => '4.17.15',
		'wp-polyfill-fetch'           => '3.0.0',
		'wp-polyfill-formdata'        => '3.0.12',
		'wp-polyfill-node-contains'   => '3.42.0',
		'wp-polyfill-url'             => '3.6.4',
		'wp-polyfill-dom-rect'        => '3.42.0',
		'wp-polyfill-element-closest' => '2.0.2',
		'wp-polyfill'                 => '7.4.4',
	);

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

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

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

	$scripts->add( 'wp-polyfill', null, array( 'wp-polyfill' ) );
	did_action( 'init' ) && $scripts->add_inline_script(
		'wp-polyfill',
		wp_get_script_polyfill(
			$scripts,
			array(
				'\'fetch\' in window' => 'wp-polyfill-fetch',
				'document.contains'   => 'wp-polyfill-node-contains',
				'window.DOMRect'      => 'wp-polyfill-dom-rect',
				'window.URL && window.URL.prototype && window.URLSearchParams' => 'wp-polyfill-url',
				'window.FormData && window.FormData.prototype.keys' => 'wp-polyfill-formdata',
				'Element.prototype.matches && Element.prototype.closest' => 'wp-polyfill-element-closest',
			)
		)
	);

	did_action( 'init' ) && $scripts->add_inline_script( 'lodash', 'window.lodash = _.noConflict();' );

	did_action( 'init' ) && $scripts->add_inline_script(
		'moment',
		sprintf(
			"moment.updateLocale( '%s', %s );",
			get_user_locale(),
			wp_json_encode(
				array(
					'months'         => array_values( $wp_locale->month ),
					'monthsShort'    => array_values( $wp_locale->month_abbrev ),
					'weekdays'       => array_values( $wp_locale->weekday ),
					'weekdaysShort'  => array_values( $wp_locale->weekday_abbrev ),
					'week'           => array(
						'dow' => (int) get_option( 'start_of_week', 0 ),
					),
					'longDateFormat' => array(
						'LT'   => get_option( 'time_format', __( 'g:i a', 'default' ) ),
						'LTS'  => null,
						'L'    => null,
						'LL'   => get_option( 'date_format', __( 'F j, Y', 'default' ) ),
						'LLL'  => __( 'F j, Y g:i a', 'default' ),
						'LLLL' => null,
					),
				)
			)
		),
		'after'
	);
}