Use Collection class rather than collect() helper

src/Install/Prerequisite/Composite.php

@@ -34,7 +34,7 @@ class Composite implements PrerequisiteInterface
             function (Collection $errors, PrerequisiteInterface $condition) {
                 return $errors->concat($condition->problems());
             },
-            collect()
+            new Collection
         );
     }
 }

src/Install/Prerequisite/PhpExtensions.php

@@ -24,7 +24,7 @@ class PhpExtensions implements PrerequisiteInterface
 
     public function problems(): Collection
     {
-        return collect($this->extensions)
+        return (new Collection($this->extensions))
             ->reject(function ($extension) {
                 return extension_loaded($extension);
             })->map(function ($extension) {

src/Install/Prerequisite/PhpVersion.php

@@ -24,13 +24,15 @@ class PhpVersion implements PrerequisiteInterface
 
     public function problems(): Collection
     {
+        $collection = new Collection;
+
         if (version_compare(PHP_VERSION, $this->minVersion, '<')) {
-            return collect()->push([
+            $collection->push([
                 'message' => "PHP $this->minVersion is required.",
                 'detail' => 'You are running version '.PHP_VERSION.'. You might want to talk to your system administrator about upgrading to the latest PHP version.',
             ]);
         }
 
-        return collect();
+        return $collection;
     }
 }

src/Install/Prerequisite/WritablePaths.php

@@ -30,7 +30,7 @@ class WritablePaths implements PrerequisiteInterface
 
     private function getMissingPaths(): Collection
     {
-        return collect($this->paths)
+        return (new Collection($this->paths))
             ->reject(function ($path) {
                 return file_exists($path);
             })->map(function ($path) {
@@ -43,7 +43,7 @@ class WritablePaths implements PrerequisiteInterface
 
     private function getNonWritablePaths(): Collection
     {
-        return collect($this->paths)
+        return (new Collection($this->paths))
             ->filter(function ($path) {
                 return file_exists($path) && ! is_writable($path);
             })->map(function ($path) {

src/Install/Steps/EnableBundledExtensions.php

@@ -18,6 +18,7 @@ use Flarum\Install\Step;
 use Flarum\Settings\DatabaseSettingsRepository;
 use Illuminate\Database\ConnectionInterface;
 use Illuminate\Support\Arr;
+use Illuminate\Support\Collection;
 use League\Flysystem\Adapter\Local;
 use League\Flysystem\Filesystem;
 
@@ -91,7 +92,7 @@ class EnableBundledExtensions implements Step
     {
         $json = file_get_contents("$this->basePath/vendor/composer/installed.json");
 
-        return collect(json_decode($json, true))
+        return (new Collection(json_decode($json, true)))
             ->filter(function ($package) {
                 return Arr::get($package, 'type') == 'flarum-extension';
             })->filter(function ($package) {