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<title>[57492] trunk: Script Modules API: Add import map polyfill for older browsers</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/57492">57492</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/57492","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>gziolo</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-01-31 08:29:18 +0000 (Wed, 31 Jan 2024)</dd>
</dl>

<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Script Modules API: Add import map polyfill for older browsers

Syncs the changes from https://github.com/WordPress/gutenberg/pull/58263. Adds a polyfill to make import maps compatible with unsported browsers (https://caniuse.com/import-maps).

Fixes <a href="https://core.trac.wordpress.org/ticket/60348">#60348</a>.
Props cbravobernal, jorbin, luisherranz, jonsurrell.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkGruntfilejs">trunk/Gruntfile.js</a></li>
<li><a href="#trunkpackagelockjson">trunk/package-lock.json</a></li>
<li><a href="#trunkpackagejson">trunk/package.json</a></li>
<li><a href="#trunksrcwpincludesclasswpscriptmodulesphp">trunk/src/wp-includes/class-wp-script-modules.php</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="#trunktestsphpunittestsscriptmoduleswpScriptModulesphp">trunk/tests/phpunit/tests/script-modules/wpScriptModules.php</a></li>
<li><a href="#trunktoolswebpackpackagesjs">trunk/tools/webpack/packages.js</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkGruntfilejs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/Gruntfile.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/Gruntfile.js        2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/Gruntfile.js  2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1559,16 +1559,18 @@
</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">        /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * Build assertions for the lack of source maps in JavaScript files.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  * Compiled JavaScript files may link to sourcemaps. In some cases,
+        * the source map may not be available, which can cause 404 errors when
+        * browsers try to download the sourcemap from the referenced URLs.
+        * Ensure that sourcemap links are not included in JavaScript files.
</ins><span class="cx" style="display: block; padding: 0 10px">          *
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 24994
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 46218
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * @ticket 60348
</ins><span class="cx" style="display: block; padding: 0 10px">          */
</span><span class="cx" style="display: block; padding: 0 10px">        grunt.registerTask( 'verify:source-maps', function() {
</span><span class="cx" style="display: block; padding: 0 10px">                const ignoredFiles = [
</span><span class="cx" style="display: block; padding: 0 10px">                        'build/wp-includes/js/dist/components.js',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        'build/wp-includes/js/dist/block-editor.js',
-                       'build/wp-includes/js/dist/block-editor.min.js'
</del><span class="cx" style="display: block; padding: 0 10px">                 ];
</span><span class="cx" style="display: block; padding: 0 10px">                const files = buildFiles.reduce( ( acc, path ) => {
</span><span class="cx" style="display: block; padding: 0 10px">                        // Skip excluded paths and any path that isn't a file.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1591,10 +1593,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        encoding: 'utf8',
</span><span class="cx" style="display: block; padding: 0 10px">                                } );
</span><span class="cx" style="display: block; padding: 0 10px">                                // `data:` URLs are allowed:
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                const match = contents.match( /sourceMappingURL=((?!data:).)/ );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         const doesNotHaveSourceMap = ! /^\/\/# sourceMappingURL=((?!data:).)/m.test(contents);
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                assert(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        match === null,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                 doesNotHaveSourceMap,
</ins><span class="cx" style="display: block; padding: 0 10px">                                         `The ${ file } file must not contain a sourceMappingURL.`
</span><span class="cx" style="display: block; padding: 0 10px">                                );
</span><span class="cx" style="display: block; padding: 0 10px">                        } );
</span></span></pre></div>
<a id="trunkpackagelockjson"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/package-lock.json</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/package-lock.json   2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/package-lock.json     2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -81,6 +81,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                "clipboard": "2.0.11",
</span><span class="cx" style="display: block; padding: 0 10px">                                "core-js-url-browser": "3.6.4",
</span><span class="cx" style="display: block; padding: 0 10px">                                "element-closest": "^3.0.2",
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                "es-module-shims": "1.8.2",
</ins><span class="cx" style="display: block; padding: 0 10px">                                 "formdata-polyfill": "4.0.10",
</span><span class="cx" style="display: block; padding: 0 10px">                                "framer-motion": "10.16.4",
</span><span class="cx" style="display: block; padding: 0 10px">                                "hoverintent": "2.2.1",
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -13349,6 +13350,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        "integrity": "sha512-vZK7T0N2CBmBOixhmjdqx2gWVbFZ4DXZ/NyRMZVlJXPa7CyFS+/a4QQsDGDQy9ZfEzxFuNEsMLeQJnKP2p5/JA==",
</span><span class="cx" style="display: block; padding: 0 10px">                        "dev": true
</span><span class="cx" style="display: block; padding: 0 10px">                },
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                "node_modules/es-module-shims": {
+                       "version": "1.8.2",
+                       "resolved": "https://registry.npmjs.org/es-module-shims/-/es-module-shims-1.8.2.tgz",
+                       "integrity": "sha512-7vIYVzpOhXtpc3Yn03itB+GSgVZFW7oL4kdydA+iL+IEi7HiSLBUxM05QFw4SxTl6e++pMpGqZPo2+vdNs3TbA=="
+               },
</ins><span class="cx" style="display: block; padding: 0 10px">                 "node_modules/es-set-tostringtag": {
</span><span class="cx" style="display: block; padding: 0 10px">                        "version": "2.0.1",
</span><span class="cx" style="display: block; padding: 0 10px">                        "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.0.1.tgz",
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -43316,6 +43322,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        "integrity": "sha512-vZK7T0N2CBmBOixhmjdqx2gWVbFZ4DXZ/NyRMZVlJXPa7CyFS+/a4QQsDGDQy9ZfEzxFuNEsMLeQJnKP2p5/JA==",
</span><span class="cx" style="display: block; padding: 0 10px">                        "dev": true
</span><span class="cx" style="display: block; padding: 0 10px">                },
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                "es-module-shims": {
+                       "version": "1.8.2",
+                       "resolved": "https://registry.npmjs.org/es-module-shims/-/es-module-shims-1.8.2.tgz",
+                       "integrity": "sha512-7vIYVzpOhXtpc3Yn03itB+GSgVZFW7oL4kdydA+iL+IEi7HiSLBUxM05QFw4SxTl6e++pMpGqZPo2+vdNs3TbA=="
+               },
</ins><span class="cx" style="display: block; padding: 0 10px">                 "es-set-tostringtag": {
</span><span class="cx" style="display: block; padding: 0 10px">                        "version": "2.0.1",
</span><span class="cx" style="display: block; padding: 0 10px">                        "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.0.1.tgz",
</span></span></pre></div>
<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        2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/package.json  2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -150,6 +150,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                "clipboard": "2.0.11",
</span><span class="cx" style="display: block; padding: 0 10px">                "core-js-url-browser": "3.6.4",
</span><span class="cx" style="display: block; padding: 0 10px">                "element-closest": "^3.0.2",
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                "es-module-shims": "1.8.2",
</ins><span class="cx" style="display: block; padding: 0 10px">                 "formdata-polyfill": "4.0.10",
</span><span class="cx" style="display: block; padding: 0 10px">                "framer-motion": "10.16.4",
</span><span class="cx" style="display: block; padding: 0 10px">                "hoverintent": "2.2.1",
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpscriptmodulesphp"></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/class-wp-script-modules.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-script-modules.php 2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/src/wp-includes/class-wp-script-modules.php   2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -211,10 +211,26 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * Prints the import map using a script tag with a type="importmap" attribute.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 6.5.0
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         *
+        * @global WP_Scripts $wp_scripts The WP_Scripts object for printing the polyfill.
</ins><span class="cx" style="display: block; padding: 0 10px">          */
</span><span class="cx" style="display: block; padding: 0 10px">        public function print_import_map() {
</span><span class="cx" style="display: block; padding: 0 10px">                $import_map = $this->get_import_map();
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $import_map['imports'] ) ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        global $wp_scripts;
+                       if ( isset( $wp_scripts ) ) {
+                               wp_print_inline_script_tag(
+                                       wp_get_script_polyfill(
+                                               $wp_scripts,
+                                               array(
+                                                       'HTMLScriptElement.supports && HTMLScriptElement.supports("importmap")' => 'wp-polyfill-importmap',
+                                               )
+                                       ),
+                                       array(
+                                               'id' => 'wp-load-polyfill-importmap',
+                                       )
+                               );
+                       }
</ins><span class="cx" style="display: block; padding: 0 10px">                         wp_print_inline_script_tag(
</span><span class="cx" style="display: block; padding: 0 10px">                                wp_json_encode( $import_map, JSON_HEX_TAG | JSON_HEX_AMP ),
</span><span class="cx" style="display: block; padding: 0 10px">                                array(
</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   2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/src/wp-includes/script-loader.php     2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -96,6 +96,7 @@
</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="cx" style="display: block; padding: 0 10px">                'wp-polyfill-formdata',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'wp-polyfill-importmap',
</ins><span class="cx" style="display: block; padding: 0 10px">                 'wp-polyfill-node-contains',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-url',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-dom-rect',
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -120,6 +121,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-object-fit'      => '2.3.5',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-inert'           => '3.1.2',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill'                 => '3.15.0',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'wp-polyfill-importmap'       => '1.8.2',
</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></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        2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/tests/phpunit/tests/dependencies/scripts.php  2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3105,6 +3105,36 @@
</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">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Test that get_script_polyfill() returns the correct polyfill.
+        *
+        * @ticket 60348
+        *
+        * @covers ::wp_get_script_polyfill
+        *
+        * @global WP_Scripts $wp_scripts WP_Scripts instance.
+        */
+       public function test_wp_get_script_polyfill() {
+               global $wp_scripts;
+               $script_name = 'wp-polyfill-importmap';
+               $test_script = 'HTMLScriptElement.supports && HTMLScriptElement.supports("importmap")';
+               $script_url  = 'https://example.com/wp-polyfill-importmap.js';
+               wp_register_script( $script_name, $script_url );
+
+               $polyfill = wp_get_script_polyfill(
+                       $wp_scripts,
+                       array(
+                               $test_script => $script_name,
+                       )
+               );
+
+               wp_deregister_script( $script_name );
+
+               $expected = '( ' . $test_script . ' ) || document.write( \'<script src="' . $script_url . '"></scr\' + \'ipt>\' );';
+
+               $this->assertEquals( $expected, $polyfill );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Data provider for test_wp_scripts_move_to_footer.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @return array[]
</span></span></pre></div>
<a id="trunktestsphpunittestsscriptmoduleswpScriptModulesphp"></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/script-modules/wpScriptModules.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/script-modules/wpScriptModules.php      2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/tests/phpunit/tests/script-modules/wpScriptModules.php        2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -11,7 +11,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @coversDefaultClass WP_Script_Modules
</span><span class="cx" style="display: block; padding: 0 10px">  */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-class Tests_WP_Script_Modules extends WP_UnitTestCase {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+class Tests_Script_Modules_WpScriptModules extends WP_UnitTestCase {
+
</ins><span class="cx" style="display: block; padding: 0 10px">         /**
</span><span class="cx" style="display: block; padding: 0 10px">         * Instance of WP_Script_Modules.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -24,6 +25,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        public function set_up() {
</span><span class="cx" style="display: block; padding: 0 10px">                parent::set_up();
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                // Set up the WP_Script_Modules instance.
</ins><span class="cx" style="display: block; padding: 0 10px">                 $this->script_modules = new WP_Script_Modules();
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -600,4 +602,37 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertCount( 1, $import_map );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertStringStartsWith( '/dep.js', $import_map['dep'] );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * @ticket 60348
+        *
+        * @covers ::print_import_map_polyfill()
+        */
+       public function test_wp_print_import_map_has_no_polyfill_when_no_modules_registered() {
+               $import_map_polyfill = get_echo( array( $this->script_modules, 'print_import_map' ) );
+
+               $this->assertEquals( '', $import_map_polyfill );
+       }
+
+       /**
+        * @ticket 60348
+        *
+        * @covers ::print_import_map_polyfill()
+        */
+       public function test_wp_print_import_map_has_polyfill_when_modules_registered() {
+               $script_name = 'wp-polyfill-importmap';
+               wp_register_script( $script_name, '/wp-polyfill-importmap.js' );
+
+               $this->script_modules->enqueue( 'foo', '/foo.js', array( 'dep' ), '1.0' );
+               $this->script_modules->register( 'dep', '/dep.js' );
+               $import_map_polyfill = get_echo( array( $this->script_modules, 'print_import_map' ) );
+
+               wp_deregister_script( $script_name );
+
+               $p = new WP_HTML_Tag_Processor( $import_map_polyfill );
+               $p->next_tag( array( 'tag' => 'SCRIPT' ) );
+               $id = $p->get_attribute( 'id' );
+
+               $this->assertEquals( 'wp-load-polyfill-importmap', $id );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</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   2024-01-31 02:52:25 UTC (rev 57491)
+++ trunk/tools/webpack/packages.js     2024-01-31 08:29:18 UTC (rev 57492)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -93,6 +93,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-object-fit.js':
</span><span class="cx" style="display: block; padding: 0 10px">                        'objectFitPolyfill/src/objectFitPolyfill.js',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-inert.js': 'wicg-inert/dist/inert.js',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'wp-polyfill-importmap.js': 'es-module-shims/dist/es-module-shims.wasm.js',
</ins><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><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -121,6 +122,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        'polyfill-library/polyfills/__dist/Node.prototype.contains/raw.js',
</span><span class="cx" style="display: block; padding: 0 10px">                'wp-polyfill-dom-rect.min.js':
</span><span class="cx" style="display: block; padding: 0 10px">                        'polyfill-library/polyfills/__dist/DOMRect/raw.js',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'wp-polyfill-importmap.min.js': 'es-module-shims/dist/es-module-shims.wasm.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 phpFiles = {
</span></span></pre>
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