[11.x] Add option to disable merging of base configuration

src/Illuminate/Foundation/Application.php

@@ -194,6 +194,13 @@ class Application extends Container implements ApplicationContract, CachesConfig
      */
     protected $namespace;
 
+    /**
+     * Indicates if the framework's base configuration should be merged.
+     *
+     * @var bool
+     */
+    protected $mergeFrameworkConfiguration = true;
+
     /**
      * The prefixes of absolute cache paths for use during normalization.
      *
@@ -1198,6 +1205,28 @@ public function handleCommand(InputInterface $input)
         return $status;
     }
 
+    /**
+     * Determine if the framework's base configuration should be merged.
+     *
+     * @return bool
+     */
+    public function shouldMergeFrameworkConfiguration()
+    {
+        return $this->mergeFrameworkConfiguration;
+    }
+
+    /**
+     * Indicate that the framework's base configuration should not be merged.
+     *
+     * @return $this
+     */
+    public function dontMergeFrameworkConfiguration()
+    {
+        $this->mergeFrameworkConfiguration = false;
+
+        return $this;
+    }
+
     /**
      * Determine if middleware has been disabled for the application.
      *

src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php

@@ -61,7 +61,13 @@ protected function loadConfigurationFiles(Application $app, RepositoryContract $
     {
         $files = $this->getConfigurationFiles($app);
 
-        $base = $this->getBaseConfiguration();
+        $shouldMerge = method_exists($app, 'shouldMergeFrameworkConfiguration')
+            ? $app->shouldMergeFrameworkConfiguration()
+            : true;
+
+        $base = $shouldMerge
+            ? $this->getBaseConfiguration()
+            : [];
 
         foreach (array_diff(array_keys($base), array_keys($files)) as $name => $config) {
             $repository->set($name, $config);

tests/Foundation/Bootstrap/LoadConfigurationTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Illuminate\Tests\Foundation\Bootstrap;
+
+use Illuminate\Foundation\Application;
+use Illuminate\Foundation\Bootstrap\LoadConfiguration;
+use PHPUnit\Framework\TestCase;
+
+class LoadConfigurationTest extends TestCase
+{
+    public function testLoadsBaseConfiguration()
+    {
+        $app = new Application();
+
+        (new LoadConfiguration())->bootstrap($app);
+
+        $this->assertSame('Laravel', $app['config']['app.name']);
+    }
+
+    public function testDontLoadBaseConfiguration()
+    {
+        $app = new Application();
+        $app->dontMergeFrameworkConfiguration();
+
+        (new LoadConfiguration())->bootstrap($app);
+
+        $this->assertNull($app['config']['app.name']);
+    }
+}