Update Psalm to 6.3.0

Author: BenMorel

composer.json

@@ -16,7 +16,7 @@
   "require-dev": {
     "php-coveralls/php-coveralls": "^2.5",
     "phpunit/phpunit": "^10.1.0",
-    "vimeo/psalm": "5.15.0"
+    "vimeo/psalm": "6.3.0"
   },
   "autoload": {
     "psr-4": {

psalm-baseline.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<files psalm-version="6.3.0@222dda8483516044c2ed7a4c3f197d7c9d6c3ddb">
+  <file src="src/NameMapper/CamelCaseToSnakeCaseMapper.php">
+    <InvalidNullableReturnType>
+      <code><![CDATA[string]]></code>
+    </InvalidNullableReturnType>
+    <NullableReturnStatement>
+      <code><![CDATA[preg_replace_callback(
+            '/[A-Z]/',
+            fn (array $matches) => '_' . strtolower($matches[0]),
+            $name,
+        )]]></code>
+    </NullableReturnStatement>
+  </file>
+  <file src="src/NameMapper/SnakeCaseToCamelCaseMapper.php">
+    <InvalidNullableReturnType>
+      <code><![CDATA[string]]></code>
+    </InvalidNullableReturnType>
+    <NullableReturnStatement>
+      <code><![CDATA[preg_replace_callback(
+            '/_([a-z])/',
+            fn (array $matches) => strtoupper($matches[1]),
+            $name,
+        )]]></code>
+    </NullableReturnStatement>
+  </file>
+  <file src="src/Reflection/Reflector.php">
+    <PossiblyNullArgument>
+      <code><![CDATA[$type]]></code>
+    </PossiblyNullArgument>
+  </file>
+</files>

psalm.xml

@@ -7,6 +7,7 @@
         xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
         findUnusedPsalmSuppress="true"
         findUnusedVariablesAndParams="true"
+        errorBaseline="psalm-baseline.xml"
 >
     <projectFiles>
         <directory name="src" />
@@ -18,4 +19,17 @@
             <file name="tests/Classes/KitchenSink.php" />
         </ignoreFiles>
     </projectFiles>
+
+    <issueHandlers>
+        <PossiblyUnusedMethod>
+            <errorLevel type="suppress">
+                <directory name="tests" />
+            </errorLevel>
+        </PossiblyUnusedMethod>
+        <UnusedClass>
+            <errorLevel type="suppress">
+                <directory name="tests" />
+            </errorLevel>
+        </UnusedClass>
+    </issueHandlers>
 </psalm>

src/Reflection/Type/SimpleType.php

@@ -11,9 +11,6 @@
  */
 final class SimpleType implements Stringable
 {
-    /**
-     * @psalm-param 'int'|'float'|'string'|'bool'|'true'|'false'|'null'|'array'|'object'|'mixed' $type
-     */
     public function __construct(
         public readonly string $name,
     ) {