symfony
diff --git a/‎src/Symfony/Component/AssetMapper/ImportMap/Resolver/JsDelivrEsmResolver.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/AssetMapper/ImportMap/Resolver/JsDelivrEsmResolver.php
+26-2Lines changed: 26 additions & 2 deletions b/‎src/Symfony/Component/AssetMapper/ImportMap/Resolver/JsDelivrEsmResolver.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/AssetMapper/ImportMap/Resolver/JsDelivrEsmResolver.php
+26-2Lines changed: 26 additions & 2 deletions
@@ -30,6 +30,8 @@ final class JsDelivrEsmResolver implements PackageResolverInterface
 
     public const IMPORT_REGEX = '#(?:import\s*(?:\w+,)?(?:(?:\{[^}]*\}|\w+|\*\s*as\s+\w+)\s*\bfrom\s*)?|export\s*(?:\{[^}]*\}|\*)\s*from\s*)("/npm/((?:@[^/]+/)?[^@]+?)(?:@([^/]+))?((?:/[^/]+)*?)/\+esm")#';
 
+    public const ES_MODULE_SHIMS = 'es-module-shims';
+
     private HttpClientInterface $httpClient;
 
     public function __construct(
@@ -78,7 +80,7 @@ public function resolvePackages(array $packagesToRequire): array
                 throw new RuntimeException(sprintf('Unable to find the latest version for package "%s" - try specifying the version manually.', $packageName));
             }
 
-            $pattern = str_ends_with($filePath, '.css') ? self::URL_PATTERN_DIST_CSS : self::URL_PATTERN_DIST;
+            $pattern = $this->resolveUrlPattern($packageName, $filePath);
             $requiredPackages[$i][1] = $this->httpClient->request('GET', sprintf($pattern, $packageName, $version, $filePath));
             $requiredPackages[$i][4] = $version;
 
@@ -169,7 +171,11 @@ public function downloadPackages(array $importMapEntries, callable $progressCall
                 throw new \InvalidArgumentException(sprintf('The entry "%s" is not a remote package.', $entry->importName));
             }
 
-            $pattern = ImportMapType::CSS === $entry->type ? self::URL_PATTERN_DIST_CSS : self::URL_PATTERN_DIST;
+            $pattern = $this->resolveUrlPattern(
+                $entry->getPackageName(),
+                $entry->getPackagePathString(),
+                $entry->type
+            );
             $url = sprintf($pattern, $entry->getPackageName(), $entry->version, $entry->getPackagePathString());
 
             $responses[$package] = [$this->httpClient->request('GET', $url), $entry];
@@ -326,4 +332,22 @@ private function makeImportsBare(string $content, array &$dependencies, array &$
 
         return preg_replace('{/\*# sourceMappingURL=[^ ]*+ \*/}', '', $content);
     }
+
+    /**
+     * Determine the URL pattern to be used by the HTTP Client.
+     */
+    private function resolveUrlPattern(string $packageName, string $path, ImportMapType $type = null): string
+    {
+        // The URL for the es-module-shims polyfill package uses the CSS pattern to
+        // prevent a syntax error in the browser console.
+        if (self::ES_MODULE_SHIMS === $packageName) {
+            return self::URL_PATTERN_DIST_CSS;
+        }
+
+        if (str_ends_with($path, '.css') || ($type && ImportMapType::CSS === $type)) {
+            return self::URL_PATTERN_DIST_CSS;
+        }
+
+        return self::URL_PATTERN_DIST;
+    }
 }