compat shim with modern composer

scripts/patch-package-manifest.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * Laravel 5.6's PackageManifest predates Composer 2. Composer 2 stores the
+ * installed package list under a "packages" key, which makes Laravel's
+ * package:discover command fail with "Undefined index: name".
+ *
+ * This script adds support for both formats to the vendored framework file.
+ * Composer runs it before package:discover, so it is safe to run repeatedly.
+ */
+
+$file = __DIR__.'/../vendor/laravel/framework/src/Illuminate/Foundation/PackageManifest.php';
+
+if (! file_exists($file)) {
+    fwrite(STDERR, "PackageManifest.php not found; skipping Composer 2 patch.\n");
+    exit(0);
+}
+
+$contents = file_get_contents($file);
+
+if (strpos($contents, "\$packages = \$packages['packages'] ?? \$packages;") !== false) {
+    exit(0);
+}
+
+$needle = '$packages = json_decode($this->files->get($path), true);';
+$replacement = $needle."\n\n            \$packages = \$packages['packages'] ?? \$packages;";
+
+if (strpos($contents, $needle) === false) {
+    fwrite(STDERR, "Could not find PackageManifest build() snippet; skipping patch.\n");
+    exit(0);
+}
+
+file_put_contents($file, str_replace($needle, $replacement, $contents));