Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Core/Composer/Composer.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Composer\Composer.
+ */
+
+namespace Drupal\Core\Composer;
+
+use Drupal\Component\PhpStorage\FileStorage;
+use Composer\Script\Event;
+
+/**
+ * Provides static functions for composer script events.
+ *
+ * @see https://getcomposer.org/doc/articles/scripts.md
+ */
+class Composer {
+
+  /**
+   * Add vendor classes to composers static classmap.
+   */
+  public static function preAutoloadDump(Event $event) {
+    $composer = $event->getComposer();
+    $package = $composer->getPackage();
+    $autoload = $package->getAutoload();
+    $autoload['classmap'] = array_merge($autoload['classmap'], array(
+      'vendor/symfony/http-foundation/Request.php',
+      'vendor/symfony/http-foundation/ParameterBag.php',
+      'vendor/symfony/http-foundation/FileBag.php',
+      'vendor/symfony/http-foundation/ServerBag.php',
+      'vendor/symfony/http-foundation/HeaderBag.php',
+      'vendor/symfony/http-kernel/HttpKernel.php',
+      'vendor/symfony/http-kernel/HttpKernelInterface.php',
+      'vendor/symfony/http-kernel/TerminableInterface.php',
+    ));
+    $package->setAutoload($autoload);
+  }
+
+  /**
+   * Ensures that .htaccess and web.config files are present in Composer root.
+   *
+   * @param \Composer\Script\Event $event
+   */
+  public static function ensureHtaccess(Event $event) {
+
+    // The current working directory for composer scripts is where you run
+    // composer from.
+    $vendor_dir = $event->getComposer()->getConfig()->get('vendor-dir');
+
+    // Prevent access to vendor directory on Apache servers.
+    $htaccess_file = $vendor_dir . '/.htaccess';
+    if (!file_exists($htaccess_file)) {
+      file_put_contents($htaccess_file, FileStorage::htaccessLines(TRUE) . "\n");
+    }
+
+    // Prevent access to vendor directory on IIS servers.
+    $webconfig_file = $vendor_dir . '/web.config';
+    if (!file_exists($webconfig_file)) {
+      $lines = <<<EOT
+<configuration>
+  <system.webServer>
+    <authorization>
+      <deny users="*">
+    </authorization>
+  </system.webServer>
+</configuration>
+EOT;
+      file_put_contents($webconfig_file, $lines . "\n");
+    }
+  }
+
+}