refactor: if conditions

$config->psr4, $config->classmap, $config->files are surely defined,
because thay are defined in CodeIgniter\Config\AutoloadConfig.

Author: kenjis

phpstan-baseline.neon.dist

@@ -10,16 +10,6 @@ parameters:
 			count: 1
 			path: system/Autoloader/Autoloader.php
 
-		-
-			message: "#^Property Config\\\\Autoload\\:\\:\\$classmap \\(array\\<string, string\\>\\) in isset\\(\\) is not nullable\\.$#"
-			count: 1
-			path: system/Autoloader/Autoloader.php
-
-		-
-			message: "#^Property Config\\\\Autoload\\:\\:\\$files \\(array\\<int, string\\>\\) in isset\\(\\) is not nullable\\.$#"
-			count: 1
-			path: system/Autoloader/Autoloader.php
-
 		-
 			message: "#^Property Config\\\\Cache\\:\\:\\$backupHandler \\(string\\) in isset\\(\\) is not nullable\\.$#"
 			count: 1

system/Autoloader/Autoloader.php

@@ -88,19 +88,19 @@ public function initialize(Autoload $config, Modules $modules)
 
         // We have to have one or the other, though we don't enforce the need
         // to have both present in order to work.
-        if (empty($config->psr4) && empty($config->classmap)) {
+        if ($config->psr4 === [] && $config->classmap === []) {
             throw new InvalidArgumentException('Config array must contain either the \'psr4\' key or the \'classmap\' key.');
         }
 
-        if (isset($config->psr4)) {
+        if ($config->psr4 !== []) {
             $this->addNamespace($config->psr4);
         }
 
-        if (isset($config->classmap)) {
+        if ($config->classmap !== []) {
             $this->classmap = $config->classmap;
         }
 
-        if (isset($config->files)) {
+        if ($config->files !== []) {
             $this->files = $config->files;
         }
 
@@ -148,7 +148,8 @@ public function register()
     /**
      * Registers namespaces with the autoloader.
      *
-     * @param array|string $namespace
+     * @param array<string, array<int, string>|string>|string $namespace
+     * @phpstan-param array<string, list<string>|string>|string $namespace
      *
      * @return $this
      */

system/Config/AutoloadConfig.php

@@ -73,6 +73,7 @@ class AutoloadConfig
      * or for loading functions.
      *
      * @var array<int, string>
+     * @phpstan-var list<string>
      */
     public $files = [];