update

vendor/phpoffice/phpspreadsheet/src/Bootstrap.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Bootstrap for PhpSpreadsheet classes.
+ */
+
+// This sucks, but we have to try to find the composer autoloader
+
+$paths = [
+    __DIR__ . '/../vendor/autoload.php', // In case PhpSpreadsheet is cloned directly
+    __DIR__ . '/../../../autoload.php', // In case PhpSpreadsheet is a composer dependency.
+];
+
+foreach ($paths as $path) {
+    if (file_exists($path)) {
+        require_once $path;
+
+        return;
+    }
+}
+
+throw new \Exception('Composer autoloader could not be found. Install dependencies with `composer install` and try again.');