Add method to override default CSRF script

src/Facades/StaticCache.php

@@ -16,6 +16,7 @@
  * @method static ApplicationCacher createApplicationDriver(array $config)
  * @method static \Illuminate\Cache\Repository cacheStore()
  * @method static void flush()
+ * @method static void csrfJs(string $js)
  * @method static void nocacheJs(string $js)
  * @method static void nocachePlaceholder(string $placeholder)
  * @method static void includeJs()

src/StaticCaching/Cachers/FileCacher.php

@@ -26,6 +26,11 @@ class FileCacher extends AbstractCacher
      */
     private $shouldOutputJs = false;
 
+    /**
+     * @var string
+     */
+    private $csrfJs;
+
     /**
      * @var string
      */
@@ -196,6 +201,11 @@ private function isLongQueryStringPath($path)
         return Str::contains($path, '_lqs_');
     }
 
+    public function setCsrfJs(string $js)
+    {
+        $this->csrfJs = $js;
+    }
+
     public function setNocacheJs(string $js)
     {
         $this->nocacheJs = $js;
@@ -205,7 +215,7 @@ public function getCsrfTokenJs(): string
     {
         $csrfPlaceholder = CsrfTokenReplacer::REPLACEMENT;
 
-        return <<<EOT
+        $default = <<<EOT
 (function() {
     fetch('/!/csrf', {
         method: 'POST',
@@ -237,6 +247,8 @@ public function getCsrfTokenJs(): string
     });
 })();
 EOT;
+
+        return $this->csrfJs ?? $default;
     }
 
     public function getNocacheJs(): string

src/StaticCaching/StaticCacheManager.php

@@ -101,6 +101,11 @@ private function flushNocache()
         $this->cacheStore()->forget('nocache::urls');
     }
 
+    public function csrfJs(string $js)
+    {
+        $this->fileDriver()->setNocacheJs($js);
+    }
+
     public function nocacheJs(string $js)
     {
         $this->fileDriver()->setNocacheJs($js);