Apply PHP 7.4 syntax and typed property

Signed-off-by: Abdul Malik Ikhsan <samsonasik@gmail.com>

Author: samsonasik

psalm-baseline.xml

@@ -164,7 +164,7 @@
       <code>$e-&gt;getCode()</code>
     </InvalidScalarArgument>
     <MissingClosureReturnType occurrences="1">
-      <code>function ($count, $param) {</code>
+      <code>static function ($count, $param) {</code>
     </MissingClosureReturnType>
     <MixedArgument occurrences="7">
       <code>$argv</code>

src/Cache.php

@@ -41,7 +41,7 @@ public static function saveSmd($filename, Server $server)
             return false;
         }
 
-        set_error_handler(function ($errno, $errstr) {
+        set_error_handler(static function ($errno, $errstr): void {
             // swallow errors; method returns false on failure
         }, E_WARNING);
 
@@ -75,7 +75,7 @@ public static function getSmd($filename)
             return false;
         }
 
-        set_error_handler(function ($errno, $errstr) {
+        set_error_handler(static function ($errno, $errstr): void {
             // swallow errors; method returns false on failure
         }, E_WARNING);
 

src/Server.php

@@ -675,7 +675,7 @@ private function validateAndPrepareNamedParams(
      */
     private function validateAndPrepareOrderedParams(array $requestedParams, array $serviceParams)
     {
-        $requiredParamsCount = array_reduce($serviceParams, function ($count, $param) {
+        $requiredParamsCount = array_reduce($serviceParams, static function ($count, $param) {
             $count += $param['optional'] ? 0 : 1;
             return $count;
         }, 0);

test/ResponseTest.php

@@ -12,8 +12,7 @@
 
 class ResponseTest extends TestCase
 {
-    /** @var Response */
-    private $response;
+    private Response $response;
     /**
      * Sets up the fixture, for example, open a network connection.
      * This method is called before a test is executed.