config_path() helper does not exist in Lumen

Found these tiny helper function here:
https://gist.github.com/mabasic/21d13eab12462e596120

Author: jelhan

src/Console/Commands/MakeApiCommand.php

@@ -42,6 +42,15 @@ class MakeApiCommand extends Command
      */
     protected $description = "Create a new JSON API configuration file";
 
+    public function configPath($filename)
+    {
+        if (function_exists('config_path')) {
+            return config_path($filename);
+        }
+
+        return app()->basePath() . '/config/' . $filename;
+    }
+
     /**
      * @param Filesystem $files
      * @return int
@@ -55,7 +64,7 @@ public function handle(Filesystem $files)
 
         $filename = sprintf('json-api-%s.php', Str::dasherize($name));
 
-        if ($files->exists($path = config_path($filename))) {
+        if ($files->exists($path = $this->configPath($filename))) {
             $this->error("JSON API '$name' already exists.");
             return 1;
         }