fix: use file_get_contents to prevent large JS files (>8KB) from being truncated

src/Drivers/LaravelHttpServer.php

@@ -317,33 +317,33 @@ private function handleRequest(AmpRequest $request): Response
      */
     private function asset(string $filepath): Response
     {
-        $file = fopen($filepath, 'r');
-
-        if ($file === false) {
-            return new Response(404);
-        }
-
         $mimeTypes = new MimeTypes();
         $contentType = $mimeTypes->getMimeTypes(pathinfo($filepath, PATHINFO_EXTENSION));
-
         $contentType = $contentType[0] ?? 'application/octet-stream';
 
         if (str_ends_with($filepath, '.js')) {
-            $temporaryStream = fopen('php://temp', 'r+');
-            assert($temporaryStream !== false, 'Failed to open temporary stream.');
-
-            // @phpstan-ignore-next-line
-            $temporaryContent = fread($file, (int) filesize($filepath));
-
-            assert($temporaryContent !== false, 'Failed to open temporary stream.');
+            // ReadableResourceStream sets php://temp to non-blocking mode, causing
+            // AMPHP's event loop to deliver only the first 8192-byte chunk for files
+            // written to a php://temp stream. Using file_get_contents + a string body
+            // sends the full content in one shot, avoiding the truncation.
+            $content = file_get_contents($filepath);
+
+            if ($content === false) {
+                return new Response(404);
+            }
 
-            $content = $this->rewriteAssetUrl($temporaryContent);
+            $content = $this->rewriteAssetUrl($content);
 
-            fwrite($temporaryStream, $content);
+            return new Response(200, [
+                'Content-Type' => $contentType,
+                'Content-Length' => (string) strlen($content),
+            ], $content);
+        }
 
-            rewind($temporaryStream);
+        $file = fopen($filepath, 'r');
 
-            $file = $temporaryStream;
+        if ($file === false) {
+            return new Response(404);
         }
 
         return new Response(200, [

tests/Unit/Drivers/Laravel/LaravelHttpServerTest.php

@@ -21,6 +21,19 @@
         ->assertDontSee('http://localhost');
 });
 
+it('serves JS files larger than 8192 bytes in full without truncation', function (): void {
+    // Create a JS file well over 8KB with a sentinel value at the very end.
+    // Before the fix, ReadableResourceStream on a php://temp stream would only
+    // deliver the first 8192-byte chunk, so the sentinel would be missing.
+    $padding = str_repeat('//' . str_repeat('x', 78) . PHP_EOL, 110); // ~8250 bytes of padding
+    @file_put_contents(
+        public_path('large.js'),
+        $padding . "console.log('END_SENTINEL');",
+    );
+
+    visit('/large.js')->assertSee('END_SENTINEL');
+});
+
 it('includes cookies set in the test', function (): void {
     Route::get('/cookies', fn (Request $request): array => $request->cookies->all());