Script Loader: stop enqueueing some now obsolete polyfills.

Stop enqueueing polyfills such as `wp-polyfill-inert` (for the `inert` attribute) and `regenerator-runtime` (for generator functions), as they are no longer needed, considering the WordPress project's [https://make.wordpress.org/core/handbook/best-practices/browser-support/ browser support policy].

In addition to that, `wp-polyfill` (essentially `core-js`) is no longer enqueued as a dependency of `react`. This was added in [43903] to ensure compatibility with IE 11, which is no longer supported by WordPress. Developers requiring `wp-polyfill` need to manually add it as a dependency for their scripts.

Props swissspidy, flixos90, adamsilverstein, youknowriad, gziolo.
Fixes #60962.

git-svn-id: https://develop.svn.wordpress.org/trunk@57981 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -89,8 +89,8 @@ function wp_default_packages_vendor( $scripts ) {
 	$suffix = wp_scripts_get_suffix();
 
 	$vendor_scripts = array(
-		'react'       => array( 'wp-polyfill' ),
-		'react-dom'   => array( 'react' ),
+		'react',
+		'react-dom' => array( 'react' ),
 		'regenerator-runtime',
 		'moment',
 		'lodash',
@@ -103,7 +103,7 @@ function wp_default_packages_vendor( $scripts ) {
 		'wp-polyfill-element-closest',
 		'wp-polyfill-object-fit',
 		'wp-polyfill-inert',
-		'wp-polyfill' => array( 'wp-polyfill-inert', 'regenerator-runtime' ),
+		'wp-polyfill',
 	);
 
 	$vendor_scripts_versions = array(

tests/phpunit/tests/dependencies/scripts.php

@@ -2072,7 +2072,7 @@ public function test_wp_add_inline_script_before_after_concat_with_core_dependen
 		$wp_scripts->base_url  = '';
 		$wp_scripts->do_concat = true;
 
-		$expected  = "<script type='text/javascript' src='/wp-admin/load-scripts.php?c=0&amp;load%5Bchunk_0%5D=jquery-core,jquery-migrate,wp-polyfill-inert,regenerator-runtime,wp-polyfill,wp-dom-ready,wp-hooks&amp;ver={$wp_version}'></script>\n";
+		$expected  = "<script type='text/javascript' src='/wp-admin/load-scripts.php?c=0&amp;load%5Bchunk_0%5D=jquery-core,jquery-migrate,wp-polyfill,wp-dom-ready,wp-hooks&amp;ver={$wp_version}'></script>\n";
 		$expected .= "<script type='text/javascript' id='test-example-js-before'>\nconsole.log(\"before\");\n</script>\n";
 		$expected .= "<script type='text/javascript' src='http://example.com' id='test-example-js'></script>\n";
 		$expected .= "<script type='text/javascript' src='/wp-includes/js/dist/i18n.min.js' id='wp-i18n-js'></script>\n";