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<title>[51212] trunk: Build/Test Tools: Add the `regenerator-runtime` script as a dependency to `wp-polyfill`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/51212">51212</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/51212","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>desrosj</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2021-06-23 00:04:47 +0000 (Wed, 23 Jun 2021)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Build/Test Tools: Add the `regenerator-runtime` script as a dependency to `wp-polyfill`.

In <a href="https://core.trac.wordpress.org/changeset/51146">[51146]</a>, the `core-js` package replaced the deprecated `@babel//polyfill` one. The `core-js` package builds `wp-polyfill` from a configuration provided by `@wordpress/babel-preset-default` instead of copying a one size fits all polyfill.

That change caused an issue where plugins and themes relying on the `regenerator-runtime` script being included in the `wp-polyfill.js` file encountering fatal JavaScript errors.

This adds the `regenerator-runtime` package to Core and registers it as a dependency for `wp-polyfill`. While Core does not require `regenerator-runtime`, it will allow for a smoother transition to using `core-js`.

This dependency will be removed in a future version of WordPress, so developers are encouraged to add `regenerator-runtime` as a dependency for any custom script that requires it.

Follow up to <a href="https://core.trac.wordpress.org/changeset/51146">[51146]</a>.

Props gziolo, herregroen, jeherve, hellofromtonya, peterwilsoncc.
Fixes <a href="https://core.trac.wordpress.org/ticket/52941">#52941</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkpackagejson">trunk/package.json</a></li>
<li><a href="#trunksrcwpincludesscriptloaderphp">trunk/src/wp-includes/script-loader.php</a></li>
<li><a href="#trunktestsphpunittestsdependenciesscriptsphp">trunk/tests/phpunit/tests/dependencies/scripts.php</a></li>
<li><a href="#trunktoolswebpackpackagesjs">trunk/tools/webpack/packages.js</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkpackagejson"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/package.json</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/package.json        2021-06-22 23:11:02 UTC (rev 51211)
+++ trunk/package.json  2021-06-23 00:04:47 UTC (rev 51212)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -147,6 +147,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                "polyfill-library": "3.105.0",
</span><span class="cx" style="display: block; padding: 0 10px">                "react": "16.13.1",
</span><span class="cx" style="display: block; padding: 0 10px">                "react-dom": "16.13.1",
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                "regenerator-runtime": "0.13.7",
</ins><span class="cx" style="display: block; padding: 0 10px">                 "twemoji": "13.1.0",
</span><span class="cx" style="display: block; padding: 0 10px">                "underscore": "1.13.1",
</span><span class="cx" style="display: block; padding: 0 10px">                "whatwg-fetch": "3.0.0"
</span></span></pre></div>
<a id="trunksrcwpincludesscriptloaderphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/script-loader.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/script-loader.php   2021-06-22 23:11:02 UTC (rev 51211)
+++ trunk/src/wp-includes/script-loader.php     2021-06-23 00:04:47 UTC (rev 51212)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -80,8 +80,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">        $suffix = wp_scripts_get_suffix();
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        $vendor_scripts = array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                'react'     => array( 'wp-polyfill' ),
-               'react-dom' => array( 'react' ),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         'react'       => array( 'wp-polyfill' ),
+               'react-dom'   => array( 'react' ),
+               'regenerator-runtime',
</ins><span class="cx" style="display: block; padding: 0 10px">                 'moment',
</span><span class="cx" style="display: block; padding: 0 10px">                'lodash',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-fetch',
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -91,12 +92,13 @@
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-dom-rect',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-element-closest',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-object-fit',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                'wp-polyfill',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         'wp-polyfill' => array( 'regenerator-runtime' ),
</ins><span class="cx" style="display: block; padding: 0 10px">         );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        $vendor_scripts_versions = array(
</span><span class="cx" style="display: block; padding: 0 10px">                'react'                       => '16.13.1',
</span><span class="cx" style="display: block; padding: 0 10px">                'react-dom'                   => '16.13.1',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'regenerator-runtime'         => '0.13.7',
</ins><span class="cx" style="display: block; padding: 0 10px">                 'moment'                      => '2.29.1',
</span><span class="cx" style="display: block; padding: 0 10px">                'lodash'                      => '4.17.19',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-fetch'           => '3.0.0',
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -106,7 +108,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-dom-rect'        => '3.104.0',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-element-closest' => '2.0.2',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-object-fit'      => '2.3.5',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                'wp-polyfill'                 => '7.4.4',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         'wp-polyfill'                 => '3.15.0',
</ins><span class="cx" style="display: block; padding: 0 10px">         );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        foreach ( $vendor_scripts as $handle => $dependencies ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -121,8 +123,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $scripts->add( $handle, $path, $dependencies, $version, 1 );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $scripts->add( 'wp-polyfill', null, array( 'wp-polyfill' ) );
-
</del><span class="cx" style="display: block; padding: 0 10px">         did_action( 'init' ) && $scripts->add_inline_script( 'lodash', 'window.lodash = _.noConflict();' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        did_action( 'init' ) && $scripts->add_inline_script(
</span></span></pre></div>
<a id="trunktestsphpunittestsdependenciesscriptsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/dependencies/scripts.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/dependencies/scripts.php        2021-06-22 23:11:02 UTC (rev 51211)
+++ trunk/tests/phpunit/tests/dependencies/scripts.php  2021-06-23 00:04:47 UTC (rev 51212)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -723,7 +723,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $ver       = get_bloginfo( 'version' );
</span><span class="cx" style="display: block; padding: 0 10px">                $suffix    = wp_scripts_get_suffix();
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $expected  = "<script type='text/javascript' src='/wp-admin/load-scripts.php?c=0&amp;load%5Bchunk_0%5D=jquery-core,jquery-migrate,wp-polyfill,wp-dom-ready,wp-hooks&amp;ver={$ver}'></script>\n";
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $expected  = "<script type='text/javascript' src='/wp-admin/load-scripts.php?c=0&amp;load%5Bchunk_0%5D=jquery-core,jquery-migrate,regenerator-runtime,wp-polyfill,wp-dom-ready,wp-hooks&amp;ver={$ver}'></script>\n";
</ins><span class="cx" style="display: block; padding: 0 10px">                 $expected .= "<script type='text/javascript' id='test-example-js-before'>\nconsole.log(\"before\");\n</script>\n";
</span><span class="cx" style="display: block; padding: 0 10px">                $expected .= "<script type='text/javascript' src='http://example.com' id='test-example-js'></script>\n";
</span><span class="cx" style="display: block; padding: 0 10px">                $expected .= "<script type='text/javascript' src='/wp-includes/js/dist/i18n{$suffix}.js' id='wp-i18n-js'></script>\n";
</span></span></pre></div>
<a id="trunktoolswebpackpackagesjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tools/webpack/packages.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tools/webpack/packages.js   2021-06-22 23:11:02 UTC (rev 51211)
+++ trunk/tools/webpack/packages.js     2021-06-23 00:04:47 UTC (rev 51212)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -84,6 +84,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                'moment.js': 'moment/moment.js',
</span><span class="cx" style="display: block; padding: 0 10px">                'react.js': 'react/umd/react.development.js',
</span><span class="cx" style="display: block; padding: 0 10px">                'react-dom.js': 'react-dom/umd/react-dom.development.js',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'regenerator-runtime.js': 'regenerator-runtime/runtime.js',
</ins><span class="cx" style="display: block; padding: 0 10px">         };
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        const minifiedVendors = {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -98,6 +99,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">        };
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        const minifyVendors = {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'regenerator-runtime.min.js': 'regenerator-runtime/runtime.js',
</ins><span class="cx" style="display: block; padding: 0 10px">                 'wp-polyfill-fetch.min.js': 'whatwg-fetch/dist/fetch.umd.js',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-element-closest.min.js': 'element-closest/element-closest.js',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-node-contains.min.js': 'polyfill-library/polyfills/__dist/Node.prototype.contains/raw.js',
</span></span></pre>
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