diff --git a/Justfile b/Justfile
new file mode 100644
index 0000000..79212f5
--- /dev/null
+++ b/Justfile
@@ -0,0 +1,34 @@
+set dotenv-load := false
+set positional-arguments
+
+export COLUMNS := '550'
+
+default:
+  @just --list
+
+php := "/usr/bin/php7.4"
+composer := "/usr/bin/php7.4 composer"
+
+cli *args='':
+    {{ php }} bin/console "$@"
+
+phpstan *args='':
+    {{ php }} vendor/bin/phpstan "${@}"
+
+watch-phpstan *args='':
+    find src/ test/ -name '*.php' | entr {{ php }} vendor/bin/phpstan "${@}"
+
+phpunit *args='':
+    cd test && {{ php }} ../vendor/bin/phpunit "${@}"
+
+composer *args='':
+    {{ composer }} "${@}"
+
+units:
+    j phpunit --exclude-group=integration
+
+prep:
+    j phpstan
+    j phpunit
+
+
diff --git a/composer.json b/composer.json
index d747276..50f0b66 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
 
     "config": {
         "platform": {
-            "php": "7.2"
+            "php": "7.4"
         },
         "allow-plugins": {
             "composer/package-versions-deprecated": true
@@ -29,14 +29,16 @@
     "require": {
         "ext-json": "*",
         "ext-curl": "*",
-        "php": ">=7.2"
+        "php": ">=7.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5",
         "phake/phake": "^4.5",
         "hamcrest/hamcrest-php": "^2.0",
         "phpdocumentor/reflection-docblock": "^5.3",
-        "phpdocumentor/type-resolver": "^1.6"
+        "phpdocumentor/type-resolver": "^1.6",
+        "phpstan/phpstan": "^2.0.0",
+        "phpstan/phpstan-phpunit": "^2.0"
     },
 
     "suggest": {
diff --git a/composer.lock b/composer.lock
index 01fdf5d..8f278b0 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "7e4bb76b0594bdf76c5f74965e702dca",
+    "content-hash": "05d868d51b3409d74615549ab1783f6d",
     "packages": [],
     "packages-dev": [
         {
@@ -537,6 +537,117 @@
             },
             "time": "2022-03-15T21:29:03+00:00"
         },
+        {
+            "name": "phpstan/phpstan",
+            "version": "2.1.17",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "89b5ef665716fa2a52ecd2633f21007a6a349053"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/89b5ef665716fa2a52ecd2633f21007a6a349053",
+                "reference": "89b5ef665716fa2a52ecd2633f21007a6a349053",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
+            "support": {
+                "docs": "https://phpstan.org/user-guide/getting-started",
+                "forum": "https://github.com/phpstan/phpstan/discussions",
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "security": "https://github.com/phpstan/phpstan/security/policy",
+                "source": "https://github.com/phpstan/phpstan-src"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-05-21T20:55:28+00:00"
+        },
+        {
+            "name": "phpstan/phpstan-phpunit",
+            "version": "2.0.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan-phpunit.git",
+                "reference": "6b92469f8a7995e626da3aa487099617b8dfa260"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/6b92469f8a7995e626da3aa487099617b8dfa260",
+                "reference": "6b92469f8a7995e626da3aa487099617b8dfa260",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4 || ^8.0",
+                "phpstan/phpstan": "^2.0.4"
+            },
+            "conflict": {
+                "phpunit/phpunit": "<7.0"
+            },
+            "require-dev": {
+                "nikic/php-parser": "^5",
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/phpstan-deprecation-rules": "^2.0",
+                "phpstan/phpstan-strict-rules": "^2.0",
+                "phpunit/phpunit": "^9.6"
+            },
+            "type": "phpstan-extension",
+            "extra": {
+                "phpstan": {
+                    "includes": [
+                        "extension.neon",
+                        "rules.neon"
+                    ]
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PHPStan\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPUnit extensions and rules for PHPStan",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan-phpunit/issues",
+                "source": "https://github.com/phpstan/phpstan-phpunit/tree/2.0.6"
+            },
+            "time": "2025-03-26T12:47:06+00:00"
+        },
         {
             "name": "phpunit/php-code-coverage",
             "version": "7.0.17",
@@ -1777,11 +1888,11 @@
     "platform": {
         "ext-json": "*",
         "ext-curl": "*",
-        "php": ">=7.2"
+        "php": ">=7.4"
     },
     "platform-dev": {},
     "platform-overrides": {
-        "php": "7.2"
+        "php": "7.4"
     },
     "plugin-api-version": "2.6.0"
 }
diff --git a/config/phpstan/Hamcrest/AnyOf.stub b/config/phpstan/Hamcrest/AnyOf.stub
new file mode 100644
index 0000000..2c3ec70
--- /dev/null
+++ b/config/phpstan/Hamcrest/AnyOf.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest\Core;
+
+class AnyOf implements \Hamcrest\Matcher
+{}
diff --git a/config/phpstan/Hamcrest/Arrays/IsArrayContainingKey.stub b/config/phpstan/Hamcrest/Arrays/IsArrayContainingKey.stub
new file mode 100644
index 0000000..7d589e2
--- /dev/null
+++ b/config/phpstan/Hamcrest/Arrays/IsArrayContainingKey.stub
@@ -0,0 +1,11 @@
+<?php
+
+namespace Hamcrest\Arrays;
+
+use Hamcrest\TypeSafeMatcher;
+
+class IsArrayContainingKey extends TypeSafeMatcher
+{}
+
+class IsArrayWithSize extends \Hamcrest\FeatureMatcher
+{}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/BaseMatcher.stub b/config/phpstan/Hamcrest/BaseMatcher.stub
new file mode 100644
index 0000000..b5b15d6
--- /dev/null
+++ b/config/phpstan/Hamcrest/BaseMatcher.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest;
+
+abstract class BaseMatcher implements Matcher
+{
+    public function describeMismatch(mixed $item, Description $description): void {}
+}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/Description.stub b/config/phpstan/Hamcrest/Description.stub
new file mode 100644
index 0000000..a1ddaf4
--- /dev/null
+++ b/config/phpstan/Hamcrest/Description.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest;
+
+interface Description
+{}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/FeatureMatcher.stub b/config/phpstan/Hamcrest/FeatureMatcher.stub
new file mode 100644
index 0000000..35718c6
--- /dev/null
+++ b/config/phpstan/Hamcrest/FeatureMatcher.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest;
+
+abstract class FeatureMatcher extends TypeSafeDiagnosingMatcher
+{}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/IsAnything.stub b/config/phpstan/Hamcrest/IsAnything.stub
new file mode 100644
index 0000000..02a8f26
--- /dev/null
+++ b/config/phpstan/Hamcrest/IsAnything.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest\Core;
+
+use Hamcrest\BaseMatcher;
+
+class IsAnything extends BaseMatcher
+{}
diff --git a/config/phpstan/Hamcrest/IsEqual.stub b/config/phpstan/Hamcrest/IsEqual.stub
new file mode 100644
index 0000000..7da88b1
--- /dev/null
+++ b/config/phpstan/Hamcrest/IsEqual.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest\Core;
+
+use Hamcrest\BaseMatcher;
+
+class IsEqual extends BaseMatcher
+{}
diff --git a/config/phpstan/Hamcrest/IsIdentical.stub b/config/phpstan/Hamcrest/IsIdentical.stub
new file mode 100644
index 0000000..37dc779
--- /dev/null
+++ b/config/phpstan/Hamcrest/IsIdentical.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest\Core;
+
+class IsIdentical implements \Hamcrest\Matcher
+{}
diff --git a/config/phpstan/Hamcrest/IsInstanceOf.stub b/config/phpstan/Hamcrest/IsInstanceOf.stub
new file mode 100644
index 0000000..3d901fd
--- /dev/null
+++ b/config/phpstan/Hamcrest/IsInstanceOf.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest\Core;
+
+class IsInstanceOf implements \Hamcrest\Matcher
+{}
diff --git a/config/phpstan/Hamcrest/IsNonEmptyString.stub b/config/phpstan/Hamcrest/IsNonEmptyString.stub
new file mode 100644
index 0000000..637e156
--- /dev/null
+++ b/config/phpstan/Hamcrest/IsNonEmptyString.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest\Text;
+
+use Hamcrest\TypeSafeMatcher;
+
+class IsNonEmptyString extends TypeSafeMatcher
+{}
diff --git a/config/phpstan/Hamcrest/IsNot.stub b/config/phpstan/Hamcrest/IsNot.stub
new file mode 100644
index 0000000..949deb9
--- /dev/null
+++ b/config/phpstan/Hamcrest/IsNot.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest\Core;
+
+use Hamcrest\BaseMatcher;
+
+class IsNot extends BaseMatcher
+{}
diff --git a/config/phpstan/Hamcrest/IsTypeOf.stub b/config/phpstan/Hamcrest/IsTypeOf.stub
new file mode 100644
index 0000000..e9edcf1
--- /dev/null
+++ b/config/phpstan/Hamcrest/IsTypeOf.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest\Core;
+
+use Hamcrest\BaseMatcher;
+
+class IsTypeOf extends BaseMatcher
+{}
diff --git a/config/phpstan/Hamcrest/Matcher.stub b/config/phpstan/Hamcrest/Matcher.stub
new file mode 100644
index 0000000..b75be7f
--- /dev/null
+++ b/config/phpstan/Hamcrest/Matcher.stub
@@ -0,0 +1,9 @@
+<?php
+
+namespace Hamcrest;
+
+interface Matcher extends SelfDescribing
+{
+    public function matches(mixed $item): bool;
+    public function describeMismatch(mixed $item, Description $description): void;
+}
diff --git a/config/phpstan/Hamcrest/Matchers.stub b/config/phpstan/Hamcrest/Matchers.stub
new file mode 100644
index 0000000..f793440
--- /dev/null
+++ b/config/phpstan/Hamcrest/Matchers.stub
@@ -0,0 +1,77 @@
+<?php
+namespace Hamcrest;
+
+class Matchers
+{
+    /**
+     * @return \Hamcrest\Core\IsEqual
+     */
+    public static function equalTo(mixed $item)
+    {}
+
+    /**
+     * @return \Hamcrest\Core\AnyOf
+     */
+    public static function anyOf(/* args... */)
+    {}
+
+    /**
+     * @return \Hamcrest\Core\IsTypeOf
+     */
+    public static function typeOf(mixed $item)
+    {}
+
+    /**
+     * @return \Hamcrest\Core\IsIdentical
+     */
+    public static function identicalTo(mixed $item)
+    {}
+
+    /**
+     * @return \Hamcrest\Arrays\IsArrayContainingKey
+     */
+    public static function hasKeyInArray(mixed $keyMatcher)
+    {}
+
+    /**
+     * @return \Hamcrest\Core\IsAnything
+     */
+    public static function anObject()
+    {}
+
+    /**
+     * @return \Hamcrest\Core\IsNot
+     */
+    public static function not(mixed $matcher)
+    {}
+
+    /**
+     * @return \Hamcrest\Text\IsEmptyString
+     */
+    public static function nonEmptyString()
+    {}
+
+    /**
+     * @return \Hamcrest\Text\StringContains
+     */
+    public static function containsString(mixed $substring)
+    {}
+
+    /**
+     * @return \Hamcrest\Arrays\IsArrayWithSize
+     */
+    public static function arrayWithSize(mixed $sizeMatcher)
+    {}
+
+    /**
+     * @return \Hamcrest\Text\IsEmptyString
+     */
+    public static function isNonEmptyString()
+    {}
+
+    /**
+     * @return \Hamcrest\Core\IsInstanceOf
+     */
+    public static function anInstanceOf(mixed $className)
+    {}
+}
diff --git a/config/phpstan/Hamcrest/SelfDescribing.stub b/config/phpstan/Hamcrest/SelfDescribing.stub
new file mode 100644
index 0000000..67b9323
--- /dev/null
+++ b/config/phpstan/Hamcrest/SelfDescribing.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest;
+
+interface SelfDescribing
+{
+    public function describeTo(Description $description): void;
+}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/StringContains.stub b/config/phpstan/Hamcrest/StringContains.stub
new file mode 100644
index 0000000..9350dec
--- /dev/null
+++ b/config/phpstan/Hamcrest/StringContains.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest\Text;
+
+class StringContains extends SubstringMatcher
+{}
diff --git a/config/phpstan/Hamcrest/Text/IsEmptyString.stub b/config/phpstan/Hamcrest/Text/IsEmptyString.stub
new file mode 100644
index 0000000..bc72b07
--- /dev/null
+++ b/config/phpstan/Hamcrest/Text/IsEmptyString.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest\Text;
+
+use Hamcrest\BaseMatcher;
+
+class IsEmptyString extends BaseMatcher
+{}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/Text/SubstringMatcher.stub b/config/phpstan/Hamcrest/Text/SubstringMatcher.stub
new file mode 100644
index 0000000..f267e08
--- /dev/null
+++ b/config/phpstan/Hamcrest/Text/SubstringMatcher.stub
@@ -0,0 +1,8 @@
+<?php
+
+namespace Hamcrest\Text;
+
+use Hamcrest\TypeSafeMatcher;
+
+abstract class SubstringMatcher extends TypeSafeMatcher
+{}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/TypeSafeDiagnosingMatcher.stub b/config/phpstan/Hamcrest/TypeSafeDiagnosingMatcher.stub
new file mode 100644
index 0000000..6b2cae0
--- /dev/null
+++ b/config/phpstan/Hamcrest/TypeSafeDiagnosingMatcher.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest;
+
+abstract class TypeSafeDiagnosingMatcher extends TypeSafeMatcher
+{}
\ No newline at end of file
diff --git a/config/phpstan/Hamcrest/TypeSafeMatcher.stub b/config/phpstan/Hamcrest/TypeSafeMatcher.stub
new file mode 100644
index 0000000..826556e
--- /dev/null
+++ b/config/phpstan/Hamcrest/TypeSafeMatcher.stub
@@ -0,0 +1,6 @@
+<?php
+
+namespace Hamcrest;
+
+abstract class TypeSafeMatcher extends BaseMatcher
+{}
\ No newline at end of file
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
new file mode 100644
index 0000000..c6ecf35
--- /dev/null
+++ b/phpstan-baseline.neon
@@ -0,0 +1,3439 @@
+parameters:
+	ignoreErrors:
+		-
+			message: '#^Method WireMock\\Serde\\ArrayMapUtils\:\:array_map_assoc\(\) return type has no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/ArrayMapUtils.php
+
+		-
+			message: '#^Method WireMock\\Serde\\ClassDiscriminator\:\:getDiscriminatedType\(\) has parameter \$data with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: src/WireMock/Serde/ClassDiscriminator.php
+
+		-
+			message: '#^Method WireMock\\Serde\\ClassDiscriminatorMapping\:\:getDiscriminatedType\(\) has parameter \$data with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: src/WireMock/Serde/ClassDiscriminatorMapping.php
+
+		-
+			message: '#^Call to an undefined static method ReflectionMethod\:\:createFromMethodName\(\)\.$#'
+			identifier: staticMethod.notFound
+			count: 1
+			path: src/WireMock/Serde/MethodFactory.php
+
+		-
+			message: '#^Method WireMock\\Serde\\PropNaming\\ConstantPropertyNamingStrategy\:\:getSerializedName\(\) has parameter \$data with no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/PropNaming/ConstantPropertyNamingStrategy.php
+
+		-
+			message: '#^Method WireMock\\Serde\\PropNaming\\PropertyNamingStrategy\:\:getSerializedName\(\) has parameter \$data with no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/PropNaming/PropertyNamingStrategy.php
+
+		-
+			message: '#^Method WireMock\\Serde\\PropNaming\\ReferencingPropertyNamingStrategy\:\:getSerializedName\(\) has parameter \$data with no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/PropNaming/ReferencingPropertyNamingStrategy.php
+
+		-
+			message: '#^Cannot call method getTypeByFullyQualifiedClassName\(\) on WireMock\\Serde\\SerdeClassDiscriminationInfo\|null\.$#'
+			identifier: method.nonObject
+			count: 1
+			path: src/WireMock/Serde/SerdeClassDefinition.php
+
+		-
+			message: '#^Property WireMock\\Serde\\SerdeClassDiscriminationInfo\:\:\$possibleSerdeTypes \(array\<string, WireMock\\Serde\\Type\\SerdeTypeClass\>\) does not accept array\<int\|string, mixed\>\.$#'
+			identifier: assign.propertyType
+			count: 1
+			path: src/WireMock/Serde/SerdeClassDiscriminationInfo.php
+
+		-
+			message: '#^Method WireMock\\Serde\\SerdeProp\:\:getData\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: src/WireMock/Serde/SerdeProp.php
+
+		-
+			message: '#^Method WireMock\\Serde\\SerdeProp\:\:getPossibleSerializedNames\(\) return type has no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/SerdeProp.php
+
+		-
+			message: '#^Method WireMock\\Serde\\SerdeProp\:\:getSerializedName\(\) has parameter \$data with no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/SerdeProp.php
+
+		-
+			message: '#^Method WireMock\\Serde\\SerdeProp\:\:instantiateAndConsumeData\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: src/WireMock/Serde/SerdeProp.php
+
+		-
+			message: '#^Method WireMock\\Serde\\SerdeProp\:\:instantiateAndConsumeData\(\) has parameter \$data with no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/SerdeProp.php
+
+		-
+			message: '#^Method WireMock\\Serde\\SerdeProp\:\:instantiateAndConsumeData\(\) has parameter \$path with no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: src/WireMock/Serde/SerdeProp.php
+
+		-
+			message: '#^Method WireMock\\Serde\\Serializer\:\:denormalize\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: src/WireMock/Serde/Serializer.php
+
+		-
+			message: '#^Method WireMock\\Serde\\Serializer\:\:denormalize\(\) has parameter \$data with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: src/WireMock/Serde/Serializer.php
+
+		-
+			message: '#^Method WireMock\\Serde\\Serializer\:\:serialize\(\) should return string but returns string\|false\.$#'
+			identifier: return.type
+			count: 1
+			path: src/WireMock/Serde/Serializer.php
+
+		-
+			message: '#^Parameter \#1 \$variable_representation of function unserialize expects string, string\|false given\.$#'
+			identifier: argument.type
+			count: 1
+			path: src/WireMock/Serde/SerializerFactory.php
+
+		-
+			message: '#^Method WireMock\\Serde\\Type\\SerdeType\:\:canDenormalize\(\) has parameter \$data with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: src/WireMock/Serde/Type/SerdeType.php
+
+		-
+			message: '#^Method WireMock\\Serde\\Type\\SerdeType\:\:denormalize\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: src/WireMock/Serde/Type/SerdeType.php
+
+		-
+			message: '#^Method WireMock\\Serde\\Type\\SerdeType\:\:denormalize\(\) has parameter \$data with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: src/WireMock/Serde/Type/SerdeType.php
+
+		-
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+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnionTypeFields.php
+
+		-
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+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnionTypeFields.php
+
+		-
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+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnionTypeFields.php
+
+		-
+			message: '#^Method WireMock\\Serde\\TestClasses\\UnwrappedAndNamedByProperty\:\:possibleNames\(\) return type has no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedAndNamedByProperty.php
+
+		-
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+			identifier: property.unused
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedAndNamedByProperty.php
+
+		-
+			message: '#^Property WireMock\\Serde\\TestClasses\\UnwrappedAndNamedByProperty\:\:\$prop is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedAndNamedByProperty.php
+
+		-
+			message: '#^Static method WireMock\\Serde\\TestClasses\\UnwrappedAndNamedByProperty\:\:possibleNames\(\) is unused\.$#'
+			identifier: method.unused
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedAndNamedByProperty.php
+
+		-
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+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedAndNamedProperty.php
+
+		-
+			message: '#^Method WireMock\\Serde\\TestClasses\\UnwrappedArrayProperty\:\:__construct\(\) has parameter \$unwrappedArray with no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedArrayProperty.php
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+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedArrayProperty.php
+
+		-
+			message: '#^Property WireMock\\Serde\\TestClasses\\UnwrappedClassProperty\:\:\$topLevel is never read, only written\.$#'
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+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedClassProperty.php
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+		-
+			message: '#^Property WireMock\\Serde\\TestClasses\\UnwrappedClassProperty\:\:\$unwrappedClass is never read, only written\.$#'
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+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedClassProperty.php
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+		-
+			message: '#^Property WireMock\\Serde\\TestClasses\\UnwrappedPrimitiveProperty\:\:\$unwrappedPrimitive is never read, only written\.$#'
+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/Serde/TestClasses/UnwrappedPrimitiveProperty.php
+
+		-
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+			identifier: missingType.iterableValue
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+			identifier: missingType.iterableValue
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+			identifier: missingType.return
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+			path: test/WireMock/Serde/Type/SerdeTypeArrayTest.php
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+		-
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+			identifier: missingType.parameter
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+		-
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+		-
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+			identifier: missingType.return
+			count: 1
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+			identifier: missingType.return
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+			path: test/WireMock/Serde/Type/SerdeTypePrimitiveTest.php
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+			path: test/WireMock/Serde/Type/SerdeTypePrimitiveTest.php
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+			path: test/WireMock/Serde/Type/SerdeTypePrimitiveTest.php
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+		-
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+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Serde/Type/SerdeTypePrimitiveTest.php
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+		-
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+			count: 1
+			path: test/WireMock/Serde/Type/SerdeTypePrimitiveTest.php
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+		-
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+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Serde/Type/SerdeTypePrimitiveTest.php
+
+		-
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+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Serde/Type/SerdeTypePrimitiveTest.php
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+		-
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
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+		-
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
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+		-
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+			identifier: missingType.iterableValue
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
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+		-
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+			identifier: missingType.iterableValue
+			count: 1
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+			identifier: missingType.return
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			identifier: missingType.parameter
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+
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+
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+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.return
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
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+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.return
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.return
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.return
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.parameter
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.return
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.return
+			count: 1
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+
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+			identifier: missingType.return
+			count: 1
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+
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+			identifier: missingType.parameter
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+			identifier: missingType.parameter
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+
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+			identifier: missingType.return
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+
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+			identifier: missingType.return
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+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+
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+
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+
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+
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+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
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+
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+			identifier: missingType.return
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+
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+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\SerdeTypeParserTest\:\:testParsingUnionWithMultipleArrayTypesIsNotSupported\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\SerdeTypeParserTest\:\:testParsingUnionWithTypedArray\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\SerdeTypeParserTest\:\:testParsingUnionWithUntypedArray\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\SerdeTypeParserTest\:\:testParsingUnsupportedTypes\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\SerdeTypeParserTest\:\:testParsingUnsupportedTypes\(\) has parameter \$type with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\SerdeTypeParserTest\:\:testParsingUntypedArray\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/SerdeTypeParserTest.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\CatchAllPrimitiveProperty\:\:\$catchAllPrimitive is never read, only written\.$#'
+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/CatchAllPrimitiveProperty.php
+
+		-
+			message: '#^Constructor of class WireMock\\SerdeGen\\TestClasses\\KitchenSink has an unused parameter \$ignoredParam\.$#'
+			identifier: constructor.unusedParameter
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:__construct\(\) has parameter \$ignoredParam with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:discriminate\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:possibleNames\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$catchall is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$catchall type has no value type specified in iterable type array\.$#'
+			identifier: missingType.iterableValue
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$fieldOnly is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$inlined is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$namedByName is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$namedByValue is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$object is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$originalName is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:\$reqArg is never read, only written\.$#'
+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Static method WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:discriminate\(\) is unused\.$#'
+			identifier: method.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Static method WireMock\\SerdeGen\\TestClasses\\KitchenSink\:\:possibleNames\(\) is unused\.$#'
+			identifier: method.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+
+		-
+			message: '#^Property WireMock\\SerdeGen\\TestClasses\\OneSimpleField\:\:\$field is unused\.$#'
+			identifier: property.unused
+			count: 1
+			path: test/WireMock/SerdeGen/TestClasses/OneSimpleField.php
+
+		-
+			message: '#^Method WireMock\\SerdeGen\\WireMockSerdeGenTest\:\:testGeneratingLookup\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/SerdeGen/WireMockSerdeGenTest.php
+
+		-
+			message: '#^Method WireMock\\Stubbing\\StubMappingTest\:\:testIdIsInArrayIfSpecified\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Method WireMock\\Stubbing\\StubMappingTest\:\:testNameIsInArrayIfSpecified\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Method WireMock\\Stubbing\\StubMappingTest\:\:testPriorityIsInArrayIfSpecified\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Method WireMock\\Stubbing\\StubMappingTest\:\:testRequestPatternAndResponseDefinitionAreAvailableInArray\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Method WireMock\\Stubbing\\StubMappingTest\:\:testScenarioArrayIsMergedIntoArrayIfSpecified\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Method WireMock\\Stubbing\\StubMappingTest\:\:toArray\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Method WireMock\\Stubbing\\StubMappingTest\:\:toArray\(\) has parameter \$obj with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Property WireMock\\Stubbing\\StubMappingTest\:\:\$_mockRequestPattern is never read, only written\.$#'
+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Property WireMock\\Stubbing\\StubMappingTest\:\:\$_mockResponseDefinition is never read, only written\.$#'
+			identifier: property.onlyWritten
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
+
+		-
+			message: '#^Property WireMock\\Stubbing\\StubMappingTest\:\:\$_serializer has no type specified\.$#'
+			identifier: missingType.property
+			count: 1
+			path: test/WireMock/Stubbing/StubMappingTest.php
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..897cd4a
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,35 @@
+includes:
+	- vendor/phpstan/phpstan-phpunit/extension.neon
+	- phpstan-baseline.neon
+
+parameters:
+    level: 8
+    paths:
+        - src
+        - test
+
+    editorUrl: 'phpstorm://open?file=%%file%%&line=%%line%%&project=wiremock-php'
+
+    reportUnmatchedIgnoredErrors: false
+
+    stubFiles:
+        - config/phpstan/Hamcrest/Description.stub
+        - config/phpstan/Hamcrest/SelfDescribing.stub
+        - config/phpstan/Hamcrest/Matcher.stub
+        - config/phpstan/Hamcrest/BaseMatcher.stub
+        - config/phpstan/Hamcrest/TypeSafeMatcher.stub
+        - config/phpstan/Hamcrest/TypeSafeDiagnosingMatcher.stub
+        - config/phpstan/Hamcrest/FeatureMatcher.stub
+        - config/phpstan/Hamcrest/Text/SubstringMatcher.stub
+        - config/phpstan/Hamcrest/Text/IsEmptyString.stub
+        - config/phpstan/Hamcrest/Matchers.stub
+        - config/phpstan/Hamcrest/IsEqual.stub
+        - config/phpstan/Hamcrest/AnyOf.stub
+        - config/phpstan/Hamcrest/IsTypeOf.stub
+        - config/phpstan/Hamcrest/IsIdentical.stub
+        - config/phpstan/Hamcrest/Arrays/IsArrayContainingKey.stub
+        - config/phpstan/Hamcrest/IsAnything.stub
+        - config/phpstan/Hamcrest/IsNot.stub
+        - config/phpstan/Hamcrest/IsNonEmptyString.stub
+        - config/phpstan/Hamcrest/StringContains.stub
+        - config/phpstan/Hamcrest/IsInstanceOf.stub
diff --git a/src/WireMock/Client/ClientException.php b/src/WireMock/Client/ClientException.php
index 12d8125..0ca63ba 100644
--- a/src/WireMock/Client/ClientException.php
+++ b/src/WireMock/Client/ClientException.php
@@ -4,8 +4,8 @@
 
 class ClientException extends \Exception
 {
-    private $_responseCode;
-    private $_response;
+    private int $_responseCode;
+    private string $_response;
 
     public function __construct(int $responseCode, string $response)
     {
diff --git a/src/WireMock/Client/CountMatchingRequestsResult.php b/src/WireMock/Client/CountMatchingRequestsResult.php
index 9e181a4..eb60905 100644
--- a/src/WireMock/Client/CountMatchingRequestsResult.php
+++ b/src/WireMock/Client/CountMatchingRequestsResult.php
@@ -8,7 +8,7 @@ class CountMatchingRequestsResult
     private $count;
 
     /**
-     * @param $count
+     * @param int $count
      */
     public function __construct($count)
     {
diff --git a/src/WireMock/Client/Curl.php b/src/WireMock/Client/Curl.php
index cd0c077..990d3ef 100644
--- a/src/WireMock/Client/Curl.php
+++ b/src/WireMock/Client/Curl.php
@@ -2,6 +2,8 @@
 
 namespace WireMock\Client;
 
+use http\Exception\RuntimeException;
+
 class Curl
 {
     /**
@@ -27,7 +29,7 @@ public function post(string $url, ?string $body = null): string
 
     /**
      * @param string $url
-     * @param array|string|null $body The request body
+     * @param string|null $body The request body
      * @return string The response body
      * @throws ClientException
      */
@@ -47,6 +49,9 @@ public function delete(string $url): string
     }
 
     /**
+     * @param non-empty-string $method
+     * @param string $url
+     * @return string
      * @throws ClientException
      */
     private function makeCurlRequest(string $method, string $url, ?string $json = null)
@@ -66,6 +71,11 @@ private function makeCurlRequest(string $method, string $url, ?string $json = nu
         ));
 
         $result = curl_exec($ch);
+        assert($result !== true, 'if CURLOPT_RETURNTRANSFER is set, this is never true');
+
+        if ($result === false) {
+            throw new RuntimeException('curl_exec failed (returned FALSE)');
+        }
 
         $responseCode = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
         if ($responseCode < 200 || $responseCode >= 300) {
diff --git a/src/WireMock/Client/DateTimeMatchingStrategy.php b/src/WireMock/Client/DateTimeMatchingStrategy.php
index 220f2d1..21d3625 100644
--- a/src/WireMock/Client/DateTimeMatchingStrategy.php
+++ b/src/WireMock/Client/DateTimeMatchingStrategy.php
@@ -35,6 +35,10 @@ class DateTimeMatchingStrategy extends ValueMatchingStrategy
     /** @var string|null */
     private $truncateExpected = null;
 
+    /**
+     * @param string $matchingType
+     * @param mixed $matchingValue
+     */
     public function __construct($matchingType, $matchingValue)
     {
         parent::__construct($matchingType, $matchingValue);
@@ -113,17 +117,26 @@ public function getTruncateExpected(): ?string
         return $this->truncateExpected;
     }
 
-    public static function before($dateTimeSpec)
+    /**
+     * @param mixed $dateTimeSpec
+     */
+    public static function before($dateTimeSpec): self
     {
         return new self("before", $dateTimeSpec);
     }
 
-    public static function equalToDateTime($dateTimeSpec)
+    /**
+     * @param mixed $dateTimeSpec
+     */
+    public static function equalToDateTime($dateTimeSpec): self
     {
         return new self("equalToDateTime", $dateTimeSpec);
     }
 
-    public static function after($dateTimeSpec)
+    /**
+     * @param mixed $dateTimeSpec
+     */
+    public static function after($dateTimeSpec): self
     {
         return new self("after", $dateTimeSpec);
     }
diff --git a/src/WireMock/Client/EqualToMatchingStrategy.php b/src/WireMock/Client/EqualToMatchingStrategy.php
index 278b8c9..05e15be 100644
--- a/src/WireMock/Client/EqualToMatchingStrategy.php
+++ b/src/WireMock/Client/EqualToMatchingStrategy.php
@@ -4,9 +4,13 @@
 
 class EqualToMatchingStrategy extends ValueMatchingStrategy
 {
-    /** @var bool */
+    /** @var boolean */
     private $caseInsensitive = false;
 
+    /**
+     * @param mixed $matchingValue
+     * @param bool $caseInsensitive
+     */
     public function __construct($matchingValue, $caseInsensitive = false)
     {
         parent::__construct('equalTo', $matchingValue);
diff --git a/src/WireMock/Client/EqualToXmlMatchingStrategy.php b/src/WireMock/Client/EqualToXmlMatchingStrategy.php
index c1151b3..1600319 100644
--- a/src/WireMock/Client/EqualToXmlMatchingStrategy.php
+++ b/src/WireMock/Client/EqualToXmlMatchingStrategy.php
@@ -3,7 +3,7 @@
 
 class EqualToXmlMatchingStrategy extends ValueMatchingStrategy
 {
-    /** @var bool */
+    /** @var boolean */
     private $enablePlaceholders;
     /** @var string|null */
     private $placeholderOpeningDelimiterRegex;
diff --git a/src/WireMock/Client/HttpWait.php b/src/WireMock/Client/HttpWait.php
index 761b3d7..c9986de 100644
--- a/src/WireMock/Client/HttpWait.php
+++ b/src/WireMock/Client/HttpWait.php
@@ -4,7 +4,12 @@
 
 class HttpWait
 {
-    public function waitForServerToGive200($url, $timeoutSecs = 10, $debug = true)
+    /**
+     * @param string $url
+     * @param int $timeoutSecs
+     * @param bool $debug
+     */
+    public function waitForServerToGive200($url, $timeoutSecs = 10, $debug = true): bool
     {
         $debugTrace = array();
         $startTime = microtime(true);
@@ -17,11 +22,11 @@ public function waitForServerToGive200($url, $timeoutSecs = 10, $debug = true)
                 continue;
             }
 
-            if (isset($headers) && isset($headers[0]) && strpos($headers[0], '200 OK') !== false) {
+            if ($headers && isset($headers[0]) && strpos($headers[0], '200 OK') !== false) {
                 $serverStarted = true;
                 break;
             } else {
-                if (!isset($headers)) {
+                if (!$headers) {
                     $debugTrace[] = "$url not yet up. \$headers not set";
                 } else if (!isset($headers[0])) {
                     $debugTrace[] = "$url not yet up. \$headers[0] not set";
@@ -42,7 +47,11 @@ public function waitForServerToGive200($url, $timeoutSecs = 10, $debug = true)
         return $serverStarted;
     }
 
-    public function waitForServerToFailToRespond($url, $timeoutSecs = 5)
+    /**
+     * @param string $url
+     * @param int $timeoutSecs
+     */
+    public function waitForServerToFailToRespond($url, $timeoutSecs = 5): bool
     {
         $startTime = microtime(true);
         $serverFailedToRespond = false;
diff --git a/src/WireMock/Client/JsonPathValueMatchingStrategy.php b/src/WireMock/Client/JsonPathValueMatchingStrategy.php
index 8955d6f..05606a5 100644
--- a/src/WireMock/Client/JsonPathValueMatchingStrategy.php
+++ b/src/WireMock/Client/JsonPathValueMatchingStrategy.php
@@ -4,13 +4,6 @@
 
 class JsonPathValueMatchingStrategy extends ValueMatchingStrategy
 {
-    /**
-     * @var string|AdvancedPathPattern
-     * @serde-named-by matchingType
-     * @serde-possible-names matchingValueNames
-     */
-    protected $matchingValue;
-
     /**
      * @param string|AdvancedPathPattern $matchingValue
      */
diff --git a/src/WireMock/Client/JsonValueMatchingStrategy.php b/src/WireMock/Client/JsonValueMatchingStrategy.php
index 11c3480..ea86b84 100644
--- a/src/WireMock/Client/JsonValueMatchingStrategy.php
+++ b/src/WireMock/Client/JsonValueMatchingStrategy.php
@@ -5,10 +5,15 @@
 class JsonValueMatchingStrategy extends ValueMatchingStrategy
 {
     /** @var boolean|null */
-    private $ignoreArrayOrder = null;
+    private $ignoreArrayOrder;
     /** @var boolean|null  */
-    private $ignoreExtraElements = null;
+    private $ignoreExtraElements;
 
+    /**
+     * @param mixed $matchingValue
+     * @param bool|null $ignoreArrayOrder
+     * @param bool|null $ignoreExtraElements  
+     */
     public function __construct($matchingValue, $ignoreArrayOrder = null, $ignoreExtraElements = null)
     {
         parent::__construct('equalToJson', $matchingValue);
@@ -17,7 +22,7 @@ public function __construct($matchingValue, $ignoreArrayOrder = null, $ignoreExt
     }
 
     /**
-     * @return bool|null
+     * @return boolean|null
      */
     public function getIgnoreArrayOrder()
     {
@@ -25,7 +30,7 @@ public function getIgnoreArrayOrder()
     }
 
     /**
-     * @return bool|null
+     * @return boolean|null
      */
     public function getIgnoreExtraElements()
     {
diff --git a/src/WireMock/Client/LoggedRequest.php b/src/WireMock/Client/LoggedRequest.php
index d788614..2cbf244 100644
--- a/src/WireMock/Client/LoggedRequest.php
+++ b/src/WireMock/Client/LoggedRequest.php
@@ -5,27 +5,27 @@
 class LoggedRequest
 {
     /** @var string */
-    private $url;
+    private $url; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var string */
-    private $absoluteUrl;
+    private $absoluteUrl; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var string */
-    private $method;
+    private $method; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var string */
-    private $clientIp;
+    private $clientIp; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var array<string, string> */
-    private $headers;
+    private $headers; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var array<string, string> */
-    private $cookies;
+    private $cookies; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var string */
-    private $body;
+    private $body; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var string */
-    private $bodyAsBase64;
-    /** @var bool */
-    private $browserProxyRequest;
+    private $bodyAsBase64; // @phpstan-ignore property.onlyRead (serde can write this)
+    /** @var boolean */
+    private $browserProxyRequest; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var int */
-    private $loggedDate;
+    private $loggedDate; // @phpstan-ignore property.onlyRead (serde can write this)
     /** @var string */
-    private $loggedDateString;
+    private $loggedDateString; // @phpstan-ignore property.onlyRead (serde can write this)
 
     /**
      * @return string
@@ -60,7 +60,7 @@ public function getClientIp()
     }
 
     /**
-     * @return array
+     * @return array<string, string>
      */
     public function getHeaders()
     {
@@ -68,7 +68,7 @@ public function getHeaders()
     }
 
     /**
-     * @return array
+     * @return array<string, string>
      */
     public function getCookies()
     {
@@ -92,7 +92,7 @@ public function getBodyAsBase64()
     }
 
     /**
-     * @return boolean
+     * @return bool
      */
     public function isBrowserProxyRequest()
     {
diff --git a/src/WireMock/Client/LoggedResponse.php b/src/WireMock/Client/LoggedResponse.php
index 4ce8bdf..557d157 100644
--- a/src/WireMock/Client/LoggedResponse.php
+++ b/src/WireMock/Client/LoggedResponse.php
@@ -6,14 +6,14 @@ class LoggedResponse
 {
     /** @var int */
     private $status;
-    /** @var array */
+    /** @var array<string, int|string> */
     private $headers;
     /** @var string */
     private $body;
 
     /**
      * @param int $status
-     * @param array $headers
+     * @param array<int|string, mixed> $headers
      * @param string $body
      */
     public function __construct($status, $body, $headers = [])
@@ -32,7 +32,7 @@ public function getStatus()
     }
 
     /**
-     * @return array
+     * @return array<int|string, mixed>
      */
     public function getHeaders()
     {
diff --git a/src/WireMock/Client/MappingBuilder.php b/src/WireMock/Client/MappingBuilder.php
index ea73bf2..895129b 100644
--- a/src/WireMock/Client/MappingBuilder.php
+++ b/src/WireMock/Client/MappingBuilder.php
@@ -20,7 +20,7 @@ class MappingBuilder
     private $priority;
     /** @var ScenarioMappingBuilder */
     private $scenarioBuilder;
-    /** @var array */
+    /** @var array<int|string, mixed> */
     private $metadata;
     /** @var boolean */
     private $isPersistent;
@@ -178,7 +178,7 @@ public function willSetStateTo($newScenarioState)
     }
 
     /**
-     * @param array $metadata
+     * @param array<int|string, mixed> $metadata
      * @return MappingBuilder
      */
     public function withMetadata(array $metadata)
@@ -189,7 +189,7 @@ public function withMetadata(array $metadata)
 
     /**
      * @param string $matcherName
-     * @param array $params
+     * @param array<int|string, mixed> $params
      * @return MappingBuilder
      */
     public function andMatching($matcherName, $params = array())
@@ -222,10 +222,9 @@ public function withPostServeAction($name, WebhookDefinition $webhook)
     }
 
     /**
-     * @return StubMapping
      * @throws \Exception
      */
-    public function build()
+    public function build(): StubMapping
     {
         $responseDefinition = $this->responseDefinitionBuilder->build();
         return new StubMapping(
diff --git a/src/WireMock/Client/MultipartValuePattern.php b/src/WireMock/Client/MultipartValuePattern.php
index b30cb6b..ad8a738 100644
--- a/src/WireMock/Client/MultipartValuePattern.php
+++ b/src/WireMock/Client/MultipartValuePattern.php
@@ -11,16 +11,16 @@ class MultipartValuePattern
     private $bodyPatterns;
     /** @var array<string, ValueMatchingStrategy>|null */
     private $headers;
-    /** @var string */
+    /** @var string|null */
     private $name;
-    /** @var string */
+    /** @var string|null */
     private $matchingType;
 
     /**
      * @param ValueMatchingStrategy[]|null $bodyPatterns
      * @param array<string, ValueMatchingStrategy>|null $headers
-     * @param string $name
-     * @param string $matchingType
+     * @param string|null $name
+     * @param string|null $matchingType
      */
     public function __construct($bodyPatterns = null, $headers = null, $name = null, $matchingType = null)
     {
@@ -31,7 +31,7 @@ public function __construct($bodyPatterns = null, $headers = null, $name = null,
     }
 
     /**
-     * @return array
+     * @return ValueMatchingStrategy[]|null
      */
     public function getBodyPatterns()
     {
@@ -39,7 +39,7 @@ public function getBodyPatterns()
     }
 
     /**
-     * @return array
+     * @return array<string, ValueMatchingStrategy>|null
      */
     public function getHeaders()
     {
@@ -47,7 +47,7 @@ public function getHeaders()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getName()
     {
@@ -55,7 +55,7 @@ public function getName()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getMatchingType()
     {
diff --git a/src/WireMock/Client/MultipartValuePatternBuilder.php b/src/WireMock/Client/MultipartValuePatternBuilder.php
index 73eeb30..b812c52 100644
--- a/src/WireMock/Client/MultipartValuePatternBuilder.php
+++ b/src/WireMock/Client/MultipartValuePatternBuilder.php
@@ -55,7 +55,7 @@ public function matchingType($type)
         return $this;
     }
 
-    public function build()
+    public function build(): MultipartValuePattern
     {
         return new MultipartValuePattern(
             $this->bodyPatterns,
diff --git a/src/WireMock/Client/NearMiss.php b/src/WireMock/Client/NearMiss.php
index bf72a8d..affae42 100644
--- a/src/WireMock/Client/NearMiss.php
+++ b/src/WireMock/Client/NearMiss.php
@@ -16,12 +16,6 @@ class NearMiss
     /** @var MatchResult */
     private $matchResult;
 
-    /**
-     * @param LoggedRequest $request
-     * @param StubMapping|null $stubMapping
-     * @param RequestPattern|null $requestPattern
-     * @param MatchResult $matchResult
-     */
     public function __construct(
         LoggedRequest $request,
         ?StubMapping $stubMapping,
@@ -34,35 +28,23 @@ public function __construct(
         $this->matchResult = $matchResult;
     }
 
-    /**
-     * @return LoggedRequest
-     */
     public function getRequest()
     {
         return $this->request;
     }
 
-    /**
-     * @return StubMapping
-     */
     public function getMapping()
     {
         return $this->stubMapping;
     }
 
-    /**
-     * @return RequestPattern
-     */
-    public function getRequestPattern()
+    public function getRequestPattern(): ?RequestPattern
     {
         return $this->requestPattern;
     }
 
-    /**
-     * @return MatchResult
-     */
-    public function getMatchResult()
+    public function getMatchResult(): MatchResult
     {
         return $this->matchResult;
     }
-}
\ No newline at end of file
+}
diff --git a/src/WireMock/Client/RequestPatternBuilder.php b/src/WireMock/Client/RequestPatternBuilder.php
index 66ce392..2f7dd70 100644
--- a/src/WireMock/Client/RequestPatternBuilder.php
+++ b/src/WireMock/Client/RequestPatternBuilder.php
@@ -8,7 +8,9 @@
 
 class RequestPatternBuilder
 {
+    /** @var string|null */
     private $method;
+    /** @var UrlMatchingStrategy|null */
     private $urlMatchingStrategy;
     /** @var array<string, ValueMatchingStrategy>|null */
     private $headers;
@@ -24,12 +26,12 @@ class RequestPatternBuilder
     private $basicCredentials;
     /** @var CustomMatcherDefinition */
     private $customMatcherDefinition;
-    /** @var ValueMatchingStrategy[] */
+    /** @var ValueMatchingStrategy|null */
     private $hostPattern;
 
     /**
      * @param string $methodOrCustomMatcherName
-     * @param UrlMatchingStrategy|array $urlMatchingStrategyOrCustomParams
+     * @param UrlMatchingStrategy|array<int|string, mixed> $urlMatchingStrategyOrCustomParams
      */
     public function __construct($methodOrCustomMatcherName, $urlMatchingStrategyOrCustomParams)
     {
@@ -118,7 +120,7 @@ public function withBasicAuth($username, $password)
 
     /**
      * @param string $customMatcherName
-     * @param array $customParams
+     * @param array<int|string, mixed> $customParams
      * @return RequestPatternBuilder
      */
     public function withCustomMatcher($customMatcherName, $customParams)
diff --git a/src/WireMock/Client/ResponseDefinitionBuilder.php b/src/WireMock/Client/ResponseDefinitionBuilder.php
index 4e9355f..9ecabca 100644
--- a/src/WireMock/Client/ResponseDefinitionBuilder.php
+++ b/src/WireMock/Client/ResponseDefinitionBuilder.php
@@ -10,24 +10,34 @@
 
 class ResponseDefinitionBuilder
 {
+    /** @var int */
     protected $status = 200;
+    /** @var string|null */
     protected $statusMessage;
+    /** @var string|null */
     protected $body;
+    /** @var string|null */
     protected $bodyFile;
+    /** @var string|null */
     protected $bodyData;
+    /** @var array<string, mixed>|null */
     protected $headers;
+    /** @var string|null */
     protected $proxyBaseUrl;
+    /** @var int|null */
     protected $fixedDelayMillis;
     /** @var DelayDistribution */
     protected $randomDelayDistribution;
     /** @var ChunkedDribbleDelay */
     protected $chunkedDribbleDelay;
+    /** @var string|null */
     protected $fault;
     /** @var string[]|null */
     private $transformers;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $transformerParameters;
 
+    /** @var array<string, mixed>|null */
     protected $additionalRequestHeaders;
     /** @var string */
     protected $proxyUrlPrefixToRemove;
@@ -84,8 +94,8 @@ public function withBodyData($bytesAsString)
     }
 
     /**
-     * @param $headerName
-     * @param $headerValue
+     * @param string $headerName
+     * @param string $headerValue
      * @return ResponseDefinitionBuilder
      */
     public function withHeader($headerName, $headerValue)
@@ -145,7 +155,7 @@ public function withLogNormalRandomDelay($median, $sigma)
 
     /**
      * @param int $lower
-     * @param int upper
+     * @param int $upper
      * @return ResponseDefinitionBuilder
      */
     public function withUniformRandomDelay($lower, $upper)
@@ -166,7 +176,7 @@ public function withChunkedDribbleDelay($numberOfChunks, $totalDurationMillis)
     }
 
     /**
-     * @param $fault
+     * @param string $fault
      * @return ResponseDefinitionBuilder
      */
     public function withFault($fault)
@@ -208,7 +218,7 @@ public function withTransformer($transformerName, $paramName, $paramValue)
         return $this;
     }
 
-    public function build()
+    public function build(): ResponseDefinition
     {
         return new ResponseDefinition(
             $this->status,
diff --git a/src/WireMock/Client/ServeEventQuery.php b/src/WireMock/Client/ServeEventQuery.php
index 825da89..b924cdb 100644
--- a/src/WireMock/Client/ServeEventQuery.php
+++ b/src/WireMock/Client/ServeEventQuery.php
@@ -54,19 +54,19 @@ public function withStubMapping($stubId)
         return $this;
     }
 
-    public function toParamsString()
+    public function toParamsString(): string
     {
         $params = [];
-        if ($this->since) {
+        if (isset($this->since)) {
             $params[] = 'since=' . urlencode($this->since->format(DateTime::ATOM));
         }
-        if ($this->limit) {
-            $params[] = 'limit=' . urlencode($this->limit);
+        if (isset($this->limit)) {
+            $params[] = 'limit=' . urlencode((string) $this->limit);
         }
-        if ($this->unmatched) {
+        if (isset($this->unmatched)) {
             $params[] = 'unmatched=true';
         }
-        if ($this->matchingStubId) {
+        if (isset($this->matchingStubId)) {
             $params[] = 'matchingStub=' . urlencode($this->matchingStubId);
         }
         return join('&', $params);
diff --git a/src/WireMock/Client/UnmatchedRequests.php b/src/WireMock/Client/UnmatchedRequests.php
index 21c5263..42303e3 100644
--- a/src/WireMock/Client/UnmatchedRequests.php
+++ b/src/WireMock/Client/UnmatchedRequests.php
@@ -28,7 +28,7 @@ public function getRequests()
     }
 
     /**
-     * @return boolean
+     * @return bool
      */
     public function getRequestJournalDisabled()
     {
diff --git a/src/WireMock/Client/ValueMatchingStrategy.php b/src/WireMock/Client/ValueMatchingStrategy.php
index ff92c4b..336da48 100644
--- a/src/WireMock/Client/ValueMatchingStrategy.php
+++ b/src/WireMock/Client/ValueMatchingStrategy.php
@@ -18,6 +18,7 @@
  */
 class ValueMatchingStrategy
 {
+    /** @var array<string, class-string> */
     private static $subclassByMatchingType = [
         'absent' => ValueMatchingStrategy::class,
         'binaryEqualTo' => ValueMatchingStrategy::class,
@@ -43,8 +44,14 @@ class ValueMatchingStrategy
         'and' => LogicalOperatorMatchingStrategy::class,
         'or' => LogicalOperatorMatchingStrategy::class,
     ];
-    /** @noinspection PhpUnusedPrivateMethodInspection */
-    private static function matchingValueNames(): array { return array_keys(self::$subclassByMatchingType); }
+    /**
+     * @return list<int|string>
+     * @noinspection PhpUnusedPrivateMethodInspection
+     */
+    private static function matchingValueNames(): array // @phpstan-ignore method.unused (used by serde)
+    {
+        return array_keys(self::$subclassByMatchingType);
+    }
 
     /** @var string */
     protected $matchingType;
@@ -55,6 +62,10 @@ private static function matchingValueNames(): array { return array_keys(self::$s
      */
     protected $matchingValue;
 
+    /**
+     * @param string $matchingType
+     * @param mixed $matchingValue
+     */
     public function __construct($matchingType, $matchingValue)
     {
         $this->matchingType = $matchingType;
@@ -70,33 +81,40 @@ public function getMatchingType(): string
     }
 
     /**
-     * @return bool|string|ValueMatchingStrategy[]
+     * @return boolean|string|ValueMatchingStrategy[]
      */
     public function getMatchingValue()
     {
         return $this->matchingValue;
     }
 
-    public function and(ValueMatchingStrategy $other)
+    public function and(ValueMatchingStrategy $other): LogicalOperatorMatchingStrategy
     {
         return LogicalOperatorMatchingStrategy::andAll($this, $other);
     }
 
-    public function or(ValueMatchingStrategy $other)
+    public function or(ValueMatchingStrategy $other): LogicalOperatorMatchingStrategy
     {
         return LogicalOperatorMatchingStrategy::orAll($this, $other);
     }
 
     /** @noinspection PhpUnusedPrivateMethodInspection */
-    private static function getDiscriminatorMapping(): ClassDiscriminator
+    private static function getDiscriminatorMapping(): ClassDiscriminator // @phpstan-ignore method.unused
     {
         return new class(self::$subclassByMatchingType) implements ClassDiscriminator {
+            /** @var array<string, class-string> */
             private $subclassByMatchingType;
+            /**
+             * @param array<string, class-string> $subclassByMatchingType
+             */
             public function __construct($subclassByMatchingType)
             {
                 $this->subclassByMatchingType = $subclassByMatchingType;
             }
 
+            /**
+             * @param array<string, mixed> $data
+             */
             function getDiscriminatedType($data): string
             {
                 foreach ($data as $key => $value) {
diff --git a/src/WireMock/Client/VerificationException.php b/src/WireMock/Client/VerificationException.php
index 06303f0..3361dc2 100644
--- a/src/WireMock/Client/VerificationException.php
+++ b/src/WireMock/Client/VerificationException.php
@@ -2,20 +2,6 @@
 
 namespace WireMock\Client;
 
-//
-// If PHPUnit is on the include path, VerificationException extends AssertionFailedError (to automatically fail tests).
-// If not, it just extends Exception (to prevent forcing a dependency on PHPUnit).
-//
-if (class_exists('PHPUnit_Framework_AssertionFailedError')) {
-    class VerificationException extends \PHPUnit_Framework_AssertionFailedError
-    {
-    }
-} else if (class_exists('\PHPUnit\Framework\AssertionFailedError')) {
-    class VerificationException extends \PHPUnit\Framework\AssertionFailedError
-    {
-    }
-} else {
-    class VerificationException extends \Exception
-    {
-    }
+class VerificationException extends \PHPUnit\Framework\AssertionFailedError
+{
 }
diff --git a/src/WireMock/Client/WireMock.php b/src/WireMock/Client/WireMock.php
index da28a7d..7c96adb 100644
--- a/src/WireMock/Client/WireMock.php
+++ b/src/WireMock/Client/WireMock.php
@@ -3,6 +3,8 @@
 namespace WireMock\Client;
 
 use DateTime;
+use http\Client\Request;
+use http\Url;
 use WireMock\Fault\DelayDistribution;
 use WireMock\Fault\GlobalDelaySettings;
 use WireMock\Matching\UrlMatchingStrategy;
@@ -23,14 +25,15 @@ class WireMock
     private $hostname;
     /** @var int */
     private $port;
-    /** @var HttpWait */
-    private $httpWait;
-    /** @var Curl  */
-    private $curl;
-    /** @var Serializer */
-    private $serializer;
+    private HttpWait $httpWait;
+    private Curl $curl;
+    private Serializer $serializer;
 
-    public static function create($hostname = 'localhost', $port = 8080)
+    /**
+     * @param string $hostname
+     * @param int $port
+     */
+    public static function create($hostname = 'localhost', $port = 8080): self
     {
         $httpWait = new HttpWait();
         $curl = new Curl();
@@ -39,6 +42,10 @@ public static function create($hostname = 'localhost', $port = 8080)
         return new self($httpWait, $curl, $serializer, $hostname, $port);
     }
 
+    /**
+     * @param string $hostname
+     * @param int $port
+     */
     public function __construct(
         HttpWait $httpWait,
         Curl $curl,
@@ -53,19 +60,23 @@ public function __construct(
         $this->serializer = $serializer;
     }
 
-    public function isAlive($timeoutSecs = 10, $debug = true)
+    /**
+     * @param boolean $debug
+     * @param int $timeoutSecs
+     */
+    public function isAlive($timeoutSecs = 10, $debug = true): bool
     {
         $url = $this->_makeUrl('__admin/');
         return $this->httpWait->waitForServerToGive200($url, $timeoutSecs, $debug);
     }
 
-    public function isShutDown()
+    public function isShutDown(): bool
     {
         $url = $this->_makeUrl('__admin/');
         return $this->httpWait->waitForServerToFailToRespond($url);
     }
 
-    public function stubFor(MappingBuilder $mappingBuilder)
+    public function stubFor(MappingBuilder $mappingBuilder): StubMapping
     {
         $stubMapping = $mappingBuilder->build();
         /** @var StubMapping $responseMapping */
@@ -74,7 +85,7 @@ public function stubFor(MappingBuilder $mappingBuilder)
         return $stubMapping;
     }
 
-    public function editStub(MappingBuilder $mappingBuilder)
+    public function editStub(MappingBuilder $mappingBuilder): StubMapping
     {
         $stubMapping = $mappingBuilder->build();
         if (!$stubMapping->getId()) {
@@ -87,7 +98,7 @@ public function editStub(MappingBuilder $mappingBuilder)
     /**
      * @param StubImport|StubImportBuilder $stubImportsOrBuilder
      */
-    public function importStubs($stubImportsOrBuilder)
+    public function importStubs($stubImportsOrBuilder): void
     {
         $stubImports = ($stubImportsOrBuilder instanceof StubImport) ?
             $stubImportsOrBuilder :
@@ -96,12 +107,12 @@ public function importStubs($stubImportsOrBuilder)
     }
 
     /**
-     * @param RequestPatternBuilder|CountMatchingStrategy|integer $requestPatternBuilderOrCount
+     * @param RequestPatternBuilder|CountMatchingStrategy|int $requestPatternBuilderOrCount
      * @param RequestPatternBuilder|null $requestPatternBuilder
      * @throws ClientException
      * @throws VerificationException
      */
-    public function verify($requestPatternBuilderOrCount, ?RequestPatternBuilder $requestPatternBuilder = null)
+    public function verify($requestPatternBuilderOrCount, ?RequestPatternBuilder $requestPatternBuilder = null): void
     {
         if ($requestPatternBuilderOrCount instanceof CountMatchingStrategy) {
             $patternBuilder = $requestPatternBuilder;
@@ -114,7 +125,7 @@ public function verify($requestPatternBuilderOrCount, ?RequestPatternBuilder $re
             $numberOfRequestsMatcher = null;
         }
 
-        $requestPattern = $patternBuilder->build();
+        $requestPattern = $patternBuilder->build(); // @phpstan-ignore method.nonObject (@TODO this looks like an actual bug to me?)
         $response = $this->doPost('__admin/requests/count', $requestPattern, CountMatchingRequestsResult::class);
         $count = $response->getCount();
 
@@ -188,15 +199,14 @@ public function findNearMissesFor($loggedRequestOrPattern)
     {
         if ($loggedRequestOrPattern instanceof LoggedRequest) {
             $path = '__admin/near-misses/request';
-        } else if ($loggedRequestOrPattern instanceof RequestPatternBuilder) {
+        } elseif ($loggedRequestOrPattern instanceof RequestPatternBuilder) {
             $loggedRequestOrPattern = $loggedRequestOrPattern->build();
             $path = '__admin/near-misses/request-pattern';
         } else {
             throw new \Exception('Unexpected near miss specifier: ' . print_r($loggedRequestOrPattern, true));
         }
-        /** @var FindNearMissesResult $result */
-        $result = $this->doPost($path, $loggedRequestOrPattern, FindNearMissesResult::class);
-        return $result;
+
+        return $this->doPost($path, $loggedRequestOrPattern, FindNearMissesResult::class);
     }
 
     /**
@@ -210,7 +220,7 @@ public function findNearMissesForAllUnmatched()
     /**
      * Deletes all serve events from the WireMock server's request journal
      */
-    public function resetAllRequests()
+    public function resetAllRequests(): void
     {
         $this->doDelete('__admin/requests');
     }
@@ -219,7 +229,7 @@ public function resetAllRequests()
      * Removes specified serve event from the WireMock server's request journal
      * @param string $id
      */
-    public function removeServeEvent($id)
+    public function removeServeEvent($id): void
     {
         $this->doDelete("__admin/requests/$id");
     }
@@ -227,7 +237,7 @@ public function removeServeEvent($id)
     /**
      * @param RequestPatternBuilder $requestPatternBuilder
      */
-    public function removeServeEvents($requestPatternBuilder)
+    public function removeServeEvents($requestPatternBuilder): void
     {
         $this->doPost('__admin/requests/remove', $requestPatternBuilder->build());
     }
@@ -235,7 +245,7 @@ public function removeServeEvents($requestPatternBuilder)
     /**
      * @param ValueMatchingStrategy $valueMatchingStrategy
      */
-    public function removeEventsByStubMetadata($valueMatchingStrategy)
+    public function removeEventsByStubMetadata($valueMatchingStrategy): void
     {
         $this->doPost('__admin/requests/remove-by-metadata', $valueMatchingStrategy);
     }
@@ -245,7 +255,7 @@ public function removeEventsByStubMetadata($valueMatchingStrategy)
      *
      * @param int $delayMillis
      */
-    public function setGlobalFixedDelay($delayMillis)
+    public function setGlobalFixedDelay($delayMillis): void
     {
         $this->doPost('__admin/settings', GlobalDelaySettings::fixed($delayMillis));
     }
@@ -253,7 +263,7 @@ public function setGlobalFixedDelay($delayMillis)
     /**
      * @param DelayDistribution $delayDistribution
      */
-    public function setGlobalRandomDelay($delayDistribution)
+    public function setGlobalRandomDelay($delayDistribution): void
     {
         $this->doPost('__admin/settings', GlobalDelaySettings::random($delayDistribution));
     }
@@ -261,12 +271,12 @@ public function setGlobalRandomDelay($delayDistribution)
     /**
      * Note: this function isn't part of the Java API
      */
-    public function resetGlobalDelays()
+    public function resetGlobalDelays(): void
     {
         $this->doPost('__admin/settings', GlobalDelaySettings::none());
     }
 
-    public function saveAllMappings()
+    public function saveAllMappings(): void
     {
         $this->doPost('__admin/mappings/save');
     }
@@ -276,7 +286,7 @@ public function saveAllMappings()
      *
      * @param string $id A string representation of a GUID
      */
-    public function removeStub($id)
+    public function removeStub($id): void
     {
         $this->doDelete('__admin/mappings/' . urlencode($id));
     }
@@ -284,7 +294,7 @@ public function removeStub($id)
     /**
      * Reset all stubbings and the request journal
      */
-    public function reset()
+    public function reset(): void
     {
         $this->doPost('__admin/reset');
     }
@@ -292,7 +302,7 @@ public function reset()
     /**
      * Reset all stubbings, reload those from the mappings directory, and reset the request journal
      */
-    public function resetToDefault()
+    public function resetToDefault(): void
     {
         $this->doPost('__admin/mappings/reset');
     }
@@ -308,7 +318,7 @@ public function getAllScenarios()
     /**
      * Reset all scenarios to the Scenario.STARTED state
      */
-    public function resetAllScenarios()
+    public function resetAllScenarios(): void
     {
         $this->doPost('__admin/scenarios/reset');
     }
@@ -317,7 +327,7 @@ public function resetAllScenarios()
      * Reset a single scenario to the Scenario.STARTED state
      * @param string $scenarioName
      */
-    public function resetScenario($scenarioName)
+    public function resetScenario($scenarioName): void
     {
         $this->doPut('__admin/scenarios/' . urlencode($scenarioName) . '/state');
     }
@@ -326,7 +336,7 @@ public function resetScenario($scenarioName)
      * @param string $scenarioName
      * @param string $stateName
      */
-    public function setScenarioState($scenarioName, $stateName)
+    public function setScenarioState($scenarioName, $stateName): void
     {
         $this->doPut(
             '__admin/scenarios/' . urlencode($scenarioName) . '/state',
@@ -334,29 +344,29 @@ public function setScenarioState($scenarioName, $stateName)
         );
     }
 
-    public function shutdownServer()
+    public function shutdownServer(): void
     {
         $this->doPost('__admin/shutdown');
     }
 
     /**
-     * @param int $limit
-     * @param int $offset
+     * @param ?int $limit
+     * @param ?int $offset
      * @return ListStubMappingsResult
      */
-    public function listAllStubMappings($limit = null, $offset = null)
+    public function listAllStubMappings(?int $limit = null, ?int $offset = null)
     {
         $pathAndParams = '__admin/mappings';
-        if ($limit || $offset) {
+        if ($limit !== null || $offset !== null) {
             $pathAndParams .= '?';
-            if ($limit) {
-                $pathAndParams .= 'limit=' . urlencode($limit);
+            if ($limit !== null) {
+                $pathAndParams .= 'limit=' . $limit;
             }
-            if ($limit && $offset) {
+            if ($limit !== null && $offset !== null) {
                 $pathAndParams .= '&';
             }
-            if ($offset) {
-                $pathAndParams .= 'offset=' . urlencode($offset);
+            if ($offset !== null) {
+                $pathAndParams .= 'offset=' . $offset;
             }
         }
         return $this->doGet($pathAndParams, ListStubMappingsResult::class);
@@ -384,7 +394,7 @@ public function findStubsByMetadata($valueMatchingStrategy)
     /**
      * @param ValueMatchingStrategy $valueMatchingStrategy
      */
-    public function removeStubsByMetadata($valueMatchingStrategy)
+    public function removeStubsByMetadata($valueMatchingStrategy): void
     {
         $this->doPost('__admin/mappings/remove-by-metadata', $valueMatchingStrategy);
     }
@@ -392,7 +402,7 @@ public function removeStubsByMetadata($valueMatchingStrategy)
     /**
      * @param RecordSpecBuilder|string $recordingSpecOrUrl
      */
-    public function startRecording($recordingSpecOrUrl)
+    public function startRecording($recordingSpecOrUrl): void
     {
         if (is_string($recordingSpecOrUrl)) {
             $spec = self::recordSpec()->forTarget($recordingSpecOrUrl)->build();
@@ -430,9 +440,15 @@ public function snapshotRecord($recordingSpecBuilder = null)
     }
 
     /**
+     * @template T of object
      * @param string $path
-     * @param string|null $resultType
+     * @param string|null|class-string<T> $resultType
      * @return mixed
+     * @phpstan-return (
+     *      $resultType is class-string<T>
+     *          ? T
+     *          : ($resultType is class-string ? object : mixed)
+     *  )
      */
     private function doGet(string $path, ?string $resultType = null)
     {
@@ -446,10 +462,16 @@ private function doGet(string $path, ?string $resultType = null)
     }
 
     /**
+     * @template T of object
      * @param string $path
      * @param mixed $body
-     * @param string|null $resultType
+     * @param string|null|class-string<T> $resultType
      * @return mixed
+     * @phpstan-return (
+     *       $resultType is class-string<T>
+     *           ? T
+     *           : ($resultType is class-string ? object : mixed)
+     *   )
      */
     private function doPost(string $path, $body = null, ?string $resultType = null)
     {
@@ -468,10 +490,16 @@ private function doPost(string $path, $body = null, ?string $resultType = null)
     }
 
     /**
+     * @template T of object
      * @param string $path
      * @param mixed $body
-     * @param string|null $resultType
+     * @param string|null|class-string<T> $resultType
      * @return mixed
+     * @phpstan-return (
+     *        $resultType is class-string<T>
+     *            ? T
+     *            : ($resultType is class-string ? object : mixed)
+     *    )
      */
     private function doPut(string $path, $body = null, ?string $resultType = null)
     {
@@ -490,9 +518,15 @@ private function doPut(string $path, $body = null, ?string $resultType = null)
     }
 
     /**
+     * @template T of object
      * @param string $path
-     * @param string|null $resultType
+     * @param string|null|class-string<T> $resultType
      * @return mixed
+     * @phpstan-return (
+     *        $resultType is class-string<T>
+     *            ? T
+     *            : ($resultType is class-string ? object : mixed)
+     *    )
      */
     private function doDelete(string $path, ?string $resultType = null)
     {
@@ -505,7 +539,7 @@ private function doDelete(string $path, ?string $resultType = null)
         }
     }
 
-    private function _makeUrl($path)
+    private function _makeUrl(string $path): string
     {
         return "http://$this->hostname:$this->port/$path";
     }
@@ -514,7 +548,7 @@ private function _makeUrl($path)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function get($urlMatchingStrategy)
+    public static function get($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -527,7 +561,7 @@ public static function get($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function post($urlMatchingStrategy)
+    public static function post($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -540,7 +574,7 @@ public static function post($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function put($urlMatchingStrategy)
+    public static function put($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -553,7 +587,7 @@ public static function put($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function delete($urlMatchingStrategy)
+    public static function delete($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -566,7 +600,7 @@ public static function delete($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function patch($urlMatchingStrategy)
+    public static function patch($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -579,7 +613,7 @@ public static function patch($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function head($urlMatchingStrategy)
+    public static function head($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -592,7 +626,7 @@ public static function head($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function options($urlMatchingStrategy)
+    public static function options($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -605,7 +639,7 @@ public static function options($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function trace($urlMatchingStrategy)
+    public static function trace($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -618,7 +652,7 @@ public static function trace($urlMatchingStrategy)
      * @param UrlMatchingStrategy|string $urlMatchingStrategy
      * @return MappingBuilder
      */
-    public static function any($urlMatchingStrategy)
+    public static function any($urlMatchingStrategy): MappingBuilder
     {
         if (is_string($urlMatchingStrategy)) {
             $urlMatchingStrategy = self::urlEqualTo($urlMatchingStrategy);
@@ -629,10 +663,10 @@ public static function any($urlMatchingStrategy)
 
     /**
      * @param string $matcherName
-     * @param array $params
+     * @param array<int|string, mixed> $params
      * @return MappingBuilder
      */
-    public static function requestMatching($matcherName, $params = array())
+    public static function requestMatching($matcherName, $params = array()): MappingBuilder
     {
         $requestPattern = new RequestPatternBuilder($matcherName, $params);
         return new MappingBuilder($requestPattern);
@@ -642,7 +676,7 @@ public static function requestMatching($matcherName, $params = array())
      * @param string $url
      * @return UrlMatchingStrategy
      */
-    public static function urlEqualTo($url)
+    public static function urlEqualTo($url): UrlMatchingStrategy
     {
         return new UrlMatchingStrategy('url', $url);
     }
@@ -651,7 +685,7 @@ public static function urlEqualTo($url)
      * @param string $urlRegex
      * @return UrlMatchingStrategy
      */
-    public static function urlMatching($urlRegex)
+    public static function urlMatching($urlRegex): UrlMatchingStrategy
     {
         return new UrlMatchingStrategy('urlPattern', $urlRegex);
     }
@@ -660,7 +694,7 @@ public static function urlMatching($urlRegex)
      * @param string $urlPath
      * @return UrlMatchingStrategy
      */
-    public static function urlPathEqualTo($urlPath)
+    public static function urlPathEqualTo($urlPath): UrlMatchingStrategy
     {
         return new UrlMatchingStrategy('urlPath', $urlPath);
     }
@@ -669,7 +703,7 @@ public static function urlPathEqualTo($urlPath)
      * @param string $urlPathRegex
      * @return UrlMatchingStrategy
      */
-    public static function urlPathMatching($urlPathRegex)
+    public static function urlPathMatching($urlPathRegex): UrlMatchingStrategy
     {
         return new UrlMatchingStrategy('urlPathPattern', $urlPathRegex);
     }
@@ -677,7 +711,7 @@ public static function urlPathMatching($urlPathRegex)
     /**
      * @return UrlMatchingStrategy
      */
-    public static function anyUrl()
+    public static function anyUrl(): UrlMatchingStrategy
     {
         return new UrlMatchingStrategy('urlPattern', '.*');
     }
@@ -686,7 +720,7 @@ public static function anyUrl()
      * @param string $value
      * @return EqualToMatchingStrategy
      */
-    public static function equalTo($value)
+    public static function equalTo($value): EqualToMatchingStrategy
     {
         return new EqualToMatchingStrategy($value);
     }
@@ -695,7 +729,7 @@ public static function equalTo($value)
      * @param string $value
      * @return EqualToMatchingStrategy
      */
-    public static function equalToIgnoreCase($value)
+    public static function equalToIgnoreCase($value): EqualToMatchingStrategy
     {
         return new EqualToMatchingStrategy($value, true);
     }
@@ -704,7 +738,7 @@ public static function equalToIgnoreCase($value)
      * @param string $base64String
      * @return ValueMatchingStrategy
      */
-    public static function binaryEqualTo($base64String)
+    public static function binaryEqualTo($base64String): ValueMatchingStrategy
     {
         return new ValueMatchingStrategy('binaryEqualTo', $base64String);
     }
@@ -713,7 +747,7 @@ public static function binaryEqualTo($base64String)
      * @param string $value
      * @return ValueMatchingStrategy
      */
-    public static function matching($value)
+    public static function matching($value): ValueMatchingStrategy
     {
         return new ValueMatchingStrategy('matches', $value);
     }
@@ -722,7 +756,7 @@ public static function matching($value)
      * @param string $value
      * @return ValueMatchingStrategy
      */
-    public static function notMatching($value)
+    public static function notMatching($value): ValueMatchingStrategy
     {
         return new ValueMatchingStrategy('doesNotMatch', $value);
     }
@@ -731,7 +765,7 @@ public static function notMatching($value)
      * @param string $value
      * @return ValueMatchingStrategy
      */
-    public static function containing($value)
+    public static function containing($value): ValueMatchingStrategy
     {
         return new ValueMatchingStrategy('contains', $value);
     }
@@ -740,18 +774,17 @@ public static function containing($value)
      * @param string $value
      * @return ValueMatchingStrategy
      */
-    public static function notContaining($value)
+    public static function notContaining($value): ValueMatchingStrategy
     {
         return new ValueMatchingStrategy('doesNotContain', $value);
     }
 
     /**
      * @param string $value
-     * @param boolean $ignoreArrayOrder
-     * @param boolean $ignoreExtraElements
-     * @return ValueMatchingStrategy
+     * @param boolean|null $ignoreArrayOrder
+     * @param boolean|null $ignoreExtraElements
      */
-    public static function equalToJson($value, $ignoreArrayOrder = null, $ignoreExtraElements = null)
+    public static function equalToJson($value, $ignoreArrayOrder = null, $ignoreExtraElements = null): JsonValueMatchingStrategy
     {
         return new JsonValueMatchingStrategy($value, $ignoreArrayOrder, $ignoreExtraElements);
     }
@@ -761,7 +794,7 @@ public static function equalToJson($value, $ignoreArrayOrder = null, $ignoreExtr
      * @param ValueMatchingStrategy $valueMatchingStrategy
      * @return JsonPathValueMatchingStrategy
      */
-    public static function matchingJsonPath($jsonPath, $valueMatchingStrategy = null)
+    public static function matchingJsonPath($jsonPath, $valueMatchingStrategy = null): JsonPathValueMatchingStrategy
     {
         return new JsonPathValueMatchingStrategy(
             $valueMatchingStrategy === null ?
@@ -780,7 +813,7 @@ public static function equalToXml($xml,
         $enablePlaceholders = false,
         $placeholderOpeningDelimiterRegex = null,
         $placeholderClosingDelimiterRegex = null
-    ) {
+    ): EqualToXmlMatchingStrategy {
         return new EqualToXmlMatchingStrategy(
             $xml,
             $enablePlaceholders,
@@ -794,15 +827,15 @@ public static function equalToXml($xml,
      * @param ValueMatchingStrategy $valueMatchingStrategy
      * @return XPathValueMatchingStrategy
      */
-    public static function matchingXPath($xPath, $valueMatchingStrategy = null)
+    public static function matchingXPath($xPath, $valueMatchingStrategy = null): XPathValueMatchingStrategy
     {
-        return new XPathValueMatchingStrategy($xPath, $valueMatchingStrategy);
+        return new XPathValueMatchingStrategy($xPath);
     }
 
     /**
      * @return MultipartValuePatternBuilder
      */
-    public static function aMultipart()
+    public static function aMultipart(): MultipartValuePatternBuilder
     {
         return new MultipartValuePatternBuilder();
     }
@@ -810,7 +843,7 @@ public static function aMultipart()
     /**
      * @return ValueMatchingStrategy
      */
-    public static function absent()
+    public static function absent(): ValueMatchingStrategy
     {
         return new ValueMatchingStrategy('absent', true);
     }
@@ -819,7 +852,7 @@ public static function absent()
      * @param int $count
      * @return CountMatchingStrategy
      */
-    public static function lessThan($count)
+    public static function lessThan($count): CountMatchingStrategy
     {
         return CountMatchingStrategy::lessThan($count);
     }
@@ -828,7 +861,7 @@ public static function lessThan($count)
      * @param int $count
      * @return CountMatchingStrategy
      */
-    public static function lessThanOrExactly($count)
+    public static function lessThanOrExactly($count): CountMatchingStrategy
     {
         return CountMatchingStrategy::lessThanOrExactly($count);
     }
@@ -837,7 +870,7 @@ public static function lessThanOrExactly($count)
      * @param int $count
      * @return CountMatchingStrategy
      */
-    public static function exactly($count)
+    public static function exactly($count): CountMatchingStrategy
     {
         return CountMatchingStrategy::exactly($count);
     }
@@ -846,7 +879,7 @@ public static function exactly($count)
      * @param int $count
      * @return CountMatchingStrategy
      */
-    public static function moreThanOrExactly($count)
+    public static function moreThanOrExactly($count): CountMatchingStrategy
     {
         return CountMatchingStrategy::moreThanOrExactly($count);
     }
@@ -855,7 +888,7 @@ public static function moreThanOrExactly($count)
      * @param int $count
      * @return CountMatchingStrategy
      */
-    public static function moreThan($count)
+    public static function moreThan($count): CountMatchingStrategy
     {
         return CountMatchingStrategy::moreThan($count);
     }
@@ -864,7 +897,7 @@ public static function moreThan($count)
      * @param string $dateTimeSpec
      * @return DateTimeMatchingStrategy
      */
-    public static function before($dateTimeSpec)
+    public static function before($dateTimeSpec): DateTimeMatchingStrategy
     {
         return DateTimeMatchingStrategy::before($dateTimeSpec);
     }
@@ -872,7 +905,7 @@ public static function before($dateTimeSpec)
     /**
      * @return DateTimeMatchingStrategy
      */
-    public static function beforeNow()
+    public static function beforeNow(): DateTimeMatchingStrategy
     {
         return DateTimeMatchingStrategy::before("now");
     }
@@ -881,7 +914,7 @@ public static function beforeNow()
      * @param string $dateTimeSpec
      * @return DateTimeMatchingStrategy
      */
-    public static function equalToDateTime($dateTimeSpec)
+    public static function equalToDateTime($dateTimeSpec): DateTimeMatchingStrategy
     {
         return DateTimeMatchingStrategy::equalToDateTime($dateTimeSpec);
     }
@@ -889,7 +922,7 @@ public static function equalToDateTime($dateTimeSpec)
     /**
      * @return DateTimeMatchingStrategy
      */
-    public static function isNow()
+    public static function isNow(): DateTimeMatchingStrategy
     {
         return DateTimeMatchingStrategy::equalToDateTime("now");
     }
@@ -898,7 +931,7 @@ public static function isNow()
      * @param string $dateTimeSpec
      * @return DateTimeMatchingStrategy
      */
-    public static function after($dateTimeSpec)
+    public static function after($dateTimeSpec): DateTimeMatchingStrategy
     {
         return DateTimeMatchingStrategy::after($dateTimeSpec);
     }
@@ -906,7 +939,7 @@ public static function after($dateTimeSpec)
     /**
      * @return DateTimeMatchingStrategy
      */
-    public static function afterNow()
+    public static function afterNow(): DateTimeMatchingStrategy
     {
         return DateTimeMatchingStrategy::after("now");
     }
@@ -915,7 +948,7 @@ public static function afterNow()
      * @param ValueMatchingStrategy ...$matchers
      * @return LogicalOperatorMatchingStrategy
      */
-    public static function and(...$matchers)
+    public static function and(...$matchers): LogicalOperatorMatchingStrategy
     {
         return LogicalOperatorMatchingStrategy::andAll(...$matchers);
     }
@@ -924,95 +957,57 @@ public static function and(...$matchers)
      * @param ValueMatchingStrategy ...$matchers
      * @return LogicalOperatorMatchingStrategy
      */
-    public static function or(...$matchers)
+    public static function or(...$matchers): LogicalOperatorMatchingStrategy
     {
         return LogicalOperatorMatchingStrategy::orAll(...$matchers);
     }
 
-    /**
-     * @return RecordSpecBuilder
-     */
-    public static function recordSpec()
+    public static function recordSpec(): RecordSpecBuilder
     {
         return new RecordSpecBuilder();
     }
 
-    /**
-     * @return ResponseDefinitionBuilder
-     */
-    public static function aResponse()
+    public static function aResponse(): ResponseDefinitionBuilder
     {
         return new ResponseDefinitionBuilder();
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function getRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function getRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('GET', $urlMatchingStrategy);
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function postRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function postRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('POST', $urlMatchingStrategy);
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function putRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function putRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('PUT', $urlMatchingStrategy);
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function deleteRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function deleteRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('DELETE', $urlMatchingStrategy);
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function optionsRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function optionsRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('OPTIONS', $urlMatchingStrategy);
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function patchRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function patchRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('PATCH', $urlMatchingStrategy);
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function headRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function headRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('HEAD', $urlMatchingStrategy);
     }
 
-    /**
-     * @param UrlMatchingStrategy $urlMatchingStrategy
-     * @return RequestPatternBuilder
-     */
-    public static function traceRequestedFor(UrlMatchingStrategy $urlMatchingStrategy)
+    public static function traceRequestedFor(UrlMatchingStrategy $urlMatchingStrategy): RequestPatternBuilder
     {
         return new RequestPatternBuilder('TRACE', $urlMatchingStrategy);
     }
@@ -1075,7 +1070,8 @@ public static function okTextXml($body)
      * @param integer $status
      * @return ResponseDefinitionBuilder
      */
-    public static function jsonResponse($body, $status) {
+    public static function jsonResponse($body, $status)
+    {
         return self::aResponse()
             ->withStatus($status)
             ->withHeader('Content-Type', "application/json")
@@ -1198,10 +1194,7 @@ public static function status($status)
         return self::aResponse()->withStatus($status);
     }
 
-    /**
-     * @return StubImportBuilder
-     */
-    public static function stubImport()
+    public static function stubImport(): StubImportBuilder
     {
         return new StubImportBuilder();
     }
diff --git a/src/WireMock/Client/XPathValueMatchingStrategy.php b/src/WireMock/Client/XPathValueMatchingStrategy.php
index 40ac304..9ec6c5c 100644
--- a/src/WireMock/Client/XPathValueMatchingStrategy.php
+++ b/src/WireMock/Client/XPathValueMatchingStrategy.php
@@ -4,13 +4,7 @@
 
 class XPathValueMatchingStrategy extends ValueMatchingStrategy
 {
-    /**
-     * @var string|AdvancedPathPattern
-     * @serde-named-by matchingType
-     * @serde-possible-names matchingValueNames
-     */
-    protected $matchingValue;
-    /** @var array|null */
+    /** @var array<string, string>|null */
     private $xPathNamespaces;
 
     /**
@@ -28,12 +22,16 @@ public function __construct($matchingValue)
      */
     public function withXPathNamespace($name, $namespaceUri)
     {
+        if (!isset($this->xPathNamespaces)) {
+            $this->xPathNamespaces = [];
+        }
+
         $this->xPathNamespaces[$name] = $namespaceUri;
         return $this;
     }
 
     /**
-     * @return array|null
+     * @return array<int|string, mixed>|null
      */
     public function getXPathNamespaces(): ?array
     {
diff --git a/src/WireMock/Fault/DelayDistribution.php b/src/WireMock/Fault/DelayDistribution.php
index 24d436f..7e3f39b 100644
--- a/src/WireMock/Fault/DelayDistribution.php
+++ b/src/WireMock/Fault/DelayDistribution.php
@@ -33,7 +33,7 @@ public function getType(): string
     }
 
     /** @noinspection PhpUnusedPrivateMethodInspection */
-    private static function getDiscriminatorMapping(): ClassDiscriminator
+    private static function getDiscriminatorMapping(): ClassDiscriminator // @phpstan-ignore method.unused
     {
         return new ClassDiscriminatorMapping('type', [
             'lognormal' => LogNormal::class,
diff --git a/src/WireMock/Fault/GlobalDelaySettings.php b/src/WireMock/Fault/GlobalDelaySettings.php
index 21c8c4c..ee26414 100644
--- a/src/WireMock/Fault/GlobalDelaySettings.php
+++ b/src/WireMock/Fault/GlobalDelaySettings.php
@@ -4,16 +4,27 @@
 
 abstract class GlobalDelaySettings
 {
+    /**
+     * @param int $millis
+     * @return array{delayDistribution: null, fixedDelay: int}
+     */
     public static function fixed($millis)
     {
         return ['delayDistribution' => null, 'fixedDelay' => $millis];
     }
 
+    /**
+     * @param DelayDistribution $distribution
+     * @return array{delayDistribution: DelayDistribution, fixedDelay: null}
+     */
     public static function random($distribution)
     {
         return ['delayDistribution' => $distribution, 'fixedDelay' => null];
     }
 
+    /**
+     * @return array{delayDistribution: null, fixedDelay: null}
+     */
     public static function none()
     {
         return ['delayDistribution' => null, 'fixedDelay' => null];
diff --git a/src/WireMock/Http/ResponseDefinition.php b/src/WireMock/Http/ResponseDefinition.php
index 1800513..6f4e59c 100644
--- a/src/WireMock/Http/ResponseDefinition.php
+++ b/src/WireMock/Http/ResponseDefinition.php
@@ -9,22 +9,22 @@ class ResponseDefinition
 {
     /** @var int */
     private $status;
-    /** @var string */
+    /** @var string|null */
     private $statusMessage;
-    /** @var string */
+    /** @var string|null */
     private $body;
-    /** @var string */
+    /** @var string|null */
     private $bodyFileName;
-    /** @var string */
+    /** @var string|null */
     private $base64Body;
-    /** @var array|null */
+    /** @var array<string, string|int>|null */
     private $headers;
-    /** @var string */
+    /** @var string|null */
     private $proxyBaseUrl;
-    /** @var array|null */
+    /** @var array<string, string|int>|null */
     private $additionalProxyRequestHeaders;
     /**
-     * @var int
+     * @var int|null
      * @serde-name fixedDelayMilliseconds
      */
     private $fixedDelayMillis;
@@ -35,31 +35,32 @@ class ResponseDefinition
     protected $randomDelayDistribution;
     /** @var ?ChunkedDribbleDelay */
     protected $chunkedDribbleDelay;
-    /** @var string */
+    /** @var string|null */
     private $fault;
     /** @var string[]|null */
     private $transformers;
-    /** @var array|null */
+    /** @var array<string, string|int>|null */
     private $transformerParameters;
-    /** @var string */
+    /** @var string|null */
     private $proxyUrlPrefixToRemove;
 
     /**
      * ResponseDefinition constructor.
      * @param int $status
-     * @param string $statusMessage
-     * @param string $body
-     * @param string $bodyFile
-     * @param string $base64Body
-     * @param array|null $headers
-     * @param string $proxyBaseUrl
-     * @param array $additionalProxyRequestHeaders
-     * @param int $fixedDelayMillis
-     * @param DelayDistribution $randomDelayDistribution
-     * @param ChunkedDribbleDelay $chunkedDribbleDelay
-     * @param string $fault
+     * @param string|null $statusMessage
+     * @param string|null $body
+     * @param string|null $bodyFile
+     * @param string|null $base64Body
+     * @param array<int|string, mixed>|null $headers
+     * @param string|null $proxyBaseUrl
+     * @param array<int|string, mixed>|null $additionalProxyRequestHeaders
+     * @param int|null $fixedDelayMillis
+     * @param DelayDistribution|null $randomDelayDistribution
+     * @param ChunkedDribbleDelay|null $chunkedDribbleDelay
+     * @param string|null $fault
      * @param string[]|null $transformers
-     * @param array|null $transformerParameters
+     * @param array<int|string, mixed>|null $transformerParameters
+     * @param string|null $proxyUrlPrefixToRemove
      */
     public function __construct(
         $status,
@@ -104,7 +105,7 @@ public function getStatus()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getStatusMessage()
     {
@@ -112,7 +113,7 @@ public function getStatusMessage()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getBody()
     {
@@ -120,7 +121,7 @@ public function getBody()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getBodyFileName()
     {
@@ -128,7 +129,7 @@ public function getBodyFileName()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getBase64Body()
     {
@@ -136,7 +137,7 @@ public function getBase64Body()
     }
 
     /**
-     * @return array
+     * @return array<int|string, mixed>|null
      */
     public function getHeaders()
     {
@@ -144,7 +145,7 @@ public function getHeaders()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getProxyBaseUrl()
     {
@@ -152,7 +153,7 @@ public function getProxyBaseUrl()
     }
 
     /**
-     * @return array
+     * @return array<int|string, mixed>|null
      */
     public function getAdditionalProxyRequestHeaders()
     {
@@ -160,7 +161,7 @@ public function getAdditionalProxyRequestHeaders()
     }
 
     /**
-     * @return int
+     * @return int|null
      */
     public function getFixedDelayMillis()
     {
@@ -168,7 +169,7 @@ public function getFixedDelayMillis()
     }
 
     /**
-     * @return DelayDistribution
+     * @return DelayDistribution|null
      */
     public function getRandomDelayDistribution()
     {
@@ -176,7 +177,7 @@ public function getRandomDelayDistribution()
     }
 
     /**
-     * @return ChunkedDribbleDelay
+     * @return ChunkedDribbleDelay|null
      */
     public function getChunkedDribbleDelay()
     {
@@ -184,7 +185,7 @@ public function getChunkedDribbleDelay()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getFault()
     {
@@ -192,7 +193,7 @@ public function getFault()
     }
 
     /**
-     * @return string[]
+     * @return string[]|null
      */
     public function getTransformers()
     {
@@ -200,7 +201,7 @@ public function getTransformers()
     }
 
     /**
-     * @return array
+     * @return array<int|string, mixed>|null
      */
     public function getTransformerParameters()
     {
@@ -208,7 +209,7 @@ public function getTransformerParameters()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getProxyUrlPrefixToRemove()
     {
diff --git a/src/WireMock/Matching/RequestPattern.php b/src/WireMock/Matching/RequestPattern.php
index 49a902b..b5c432f 100644
--- a/src/WireMock/Matching/RequestPattern.php
+++ b/src/WireMock/Matching/RequestPattern.php
@@ -8,7 +8,7 @@
 
 class RequestPattern
 {
-    /** @var string */
+    /** @var string|null */
     private $method;
     /**
      * @var UrlMatchingStrategy|null
@@ -33,12 +33,12 @@ class RequestPattern
     private $host;
 
     /**
-     * @param string $method
-     * @param UrlMatchingStrategy $urlMatchingStrategy
+     * @param string|null $method
+     * @param UrlMatchingStrategy|null $urlMatchingStrategy
      * @param array<string, ValueMatchingStrategy>|null $headers
      * @param array<string, ValueMatchingStrategy>|null $cookies
      * @param ValueMatchingStrategy[]|null $bodyPatterns
-     * @param ValueMatchingStrategy[] $multipartPatterns
+     * @param MultipartValuePattern[]|null $multipartPatterns
      * @param array<string, ValueMatchingStrategy>|null $queryParameters
      * @param BasicCredentials $basicCredentials
      * @param CustomMatcherDefinition $customMatcherDefinition
@@ -69,7 +69,7 @@ public function __construct(
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getMethod()
     {
@@ -77,7 +77,7 @@ public function getMethod()
     }
 
     /**
-     * @return UrlMatchingStrategy
+     * @return UrlMatchingStrategy|null
      */
     public function getUrlMatchingStrategy()
     {
@@ -85,7 +85,7 @@ public function getUrlMatchingStrategy()
     }
 
     /**
-     * @return array<string, ValueMatchingStrategy>
+     * @return array<string, ValueMatchingStrategy>|null
      */
     public function getHeaders()
     {
@@ -93,7 +93,7 @@ public function getHeaders()
     }
 
     /**
-     * @return array<string, ValueMatchingStrategy>
+     * @return array<string, ValueMatchingStrategy>|null
      */
     public function getCookies()
     {
@@ -101,7 +101,7 @@ public function getCookies()
     }
 
     /**
-     * @return array<string, ValueMatchingStrategy>
+     * @return array<string, ValueMatchingStrategy>|null
      */
     public function getQueryParameters()
     {
@@ -109,7 +109,7 @@ public function getQueryParameters()
     }
 
     /**
-     * @return ValueMatchingStrategy[]
+     * @return ValueMatchingStrategy[]|null
      */
     public function getBodyPatterns()
     {
@@ -117,7 +117,7 @@ public function getBodyPatterns()
     }
 
     /**
-     * @return ValueMatchingStrategy[]
+     * @return MultipartValuePattern[]|null
      */
     public function getMultipartPatterns()
     {
@@ -125,7 +125,7 @@ public function getMultipartPatterns()
     }
 
     /**
-     * @return BasicCredentials
+     * @return BasicCredentials|null
      */
     public function getBasicAuthCredentials()
     {
@@ -133,7 +133,7 @@ public function getBasicAuthCredentials()
     }
 
     /**
-     * @return CustomMatcherDefinition
+     * @return CustomMatcherDefinition|null
      */
     public function getCustomMatcher()
     {
diff --git a/src/WireMock/Matching/UrlMatchingStrategy.php b/src/WireMock/Matching/UrlMatchingStrategy.php
index 353b3e4..0283c8e 100644
--- a/src/WireMock/Matching/UrlMatchingStrategy.php
+++ b/src/WireMock/Matching/UrlMatchingStrategy.php
@@ -13,8 +13,11 @@ class UrlMatchingStrategy
      */
     private $matchingValue;
 
-    /** @noinspection PhpUnusedPrivateMethodInspection */
-    private static function matchingValueNames(): array
+    /**
+     * @noinspection PhpUnusedPrivateMethodInspection
+     * @return list<string>
+     */
+    private static function matchingValueNames(): array // @phpstan-ignore method.unused
     {
         return ['url', 'urlPattern', 'urlPath', 'urlPathPattern'];
     }
diff --git a/src/WireMock/PostServe/WebhookDefinition.php b/src/WireMock/PostServe/WebhookDefinition.php
index a629216..645837a 100644
--- a/src/WireMock/PostServe/WebhookDefinition.php
+++ b/src/WireMock/PostServe/WebhookDefinition.php
@@ -22,7 +22,7 @@ class WebhookDefinition
     /** @var DelayDistribution|null */
     private $delay;
     /**
-     * @var array|null
+     * @var array<string, string|int>|null
      * @serde-catch-all
      */
     private $extraParameters;
@@ -80,6 +80,9 @@ public function withUniformRandomDelay(int $lower, int $upper): self
         return $this->withRandomDelay(new UniformDistribution($lower, $upper));
     }
 
+    /**
+     * @param mixed $value
+     */
     public function withExtraParameter(string $name, $value): self
     {
         $this->extraParameters[$name] = $value;
@@ -137,7 +140,7 @@ public function getDelay(): ?DelayDistribution
     }
 
     /**
-     * @return array|null
+     * @return array<int|string, mixed>|null
      */
     public function getExtraParameters(): ?array
     {
diff --git a/src/WireMock/Recording/ProxiedServeEventFilters.php b/src/WireMock/Recording/ProxiedServeEventFilters.php
index f6ab74d..4d928aa 100644
--- a/src/WireMock/Recording/ProxiedServeEventFilters.php
+++ b/src/WireMock/Recording/ProxiedServeEventFilters.php
@@ -21,6 +21,9 @@ class ProxiedServeEventFilters
     /** @var ?boolean */
     private $allowNonProxied;
 
+    /**
+     * @param array<int|string, mixed> $requestIds
+     */
     public function __construct(?RequestPattern $requestPattern, ?array $requestIds, ?bool $allowNonProxied)
     {
         $this->requestPattern = $requestPattern;
@@ -33,6 +36,9 @@ public function getRequestPattern(): ?RequestPattern
         return $this->requestPattern;
     }
 
+    /**
+     * @return array<int|string, mixed>
+     */
     public function getRequestIds(): ?array
     {
         return $this->requestIds;
diff --git a/src/WireMock/Recording/RecordSpec.php b/src/WireMock/Recording/RecordSpec.php
index 2af806a..8714e6e 100644
--- a/src/WireMock/Recording/RecordSpec.php
+++ b/src/WireMock/Recording/RecordSpec.php
@@ -11,9 +11,9 @@ class RecordSpec
     private $targetBaseUrl;
     /** @var ProxiedServeEventFilters|null */
     private $filters;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $captureHeaders;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $extractBodyCriteria;
     /** @var boolean */
     private $persist;
@@ -21,24 +21,24 @@ class RecordSpec
     private $repeatsAsScenarios;
     /** @var string[]|null */
     private $transformers;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $transformerParameters;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $requestBodyPattern;
-    /** @var string */
+    /** @var string|null */
     private $outputFormat;
 
     /**
      * @param string $targetBaseUrl
-     * @param ProxiedServeEventFilters $filters
-     * @param array|null $captureHeaders
-     * @param array $extractBodyCriteria
+     * @param ProxiedServeEventFilters|null $filters
+     * @param array<int|string, mixed>|null $captureHeaders
+     * @param array<int|string, mixed>|null $extractBodyCriteria
      * @param boolean $persist
      * @param boolean $repeatsAsScenarios
-     * @param string[] $transformers
-     * @param array $transformerParameters
-     * @param array $requestBodyPattern
-     * @param string $outputFormat
+     * @param string[]|null $transformers
+     * @param array<int|string, mixed>|null $transformerParameters
+     * @param array<int|string, mixed>|null $requestBodyPattern
+     * @param string|null $outputFormat
      */
     public function __construct(
         $targetBaseUrl,
@@ -81,7 +81,7 @@ public function getFilters(): ?ProxiedServeEventFilters
     }
 
     /**
-     * @return array|null
+     * @return array<int|string, mixed>|null
      */
     public function getCaptureHeaders(): ?array
     {
@@ -89,7 +89,7 @@ public function getCaptureHeaders(): ?array
     }
 
     /**
-     * @return array|null
+     * @return array<int|string, mixed>|null
      */
     public function getExtractBodyCriteria(): ?array
     {
@@ -121,7 +121,7 @@ public function getTransformers(): ?array
     }
 
     /**
-     * @return array|null
+     * @return array<int|string, mixed>|null
      */
     public function getTransformerParameters(): ?array
     {
@@ -129,7 +129,7 @@ public function getTransformerParameters(): ?array
     }
 
     /**
-     * @return array
+     * @return array<int|string, mixed>
      */
     public function getRequestBodyPattern(): ?array
     {
diff --git a/src/WireMock/Recording/RecordSpecBuilder.php b/src/WireMock/Recording/RecordSpecBuilder.php
index b90d497..825ff75 100644
--- a/src/WireMock/Recording/RecordSpecBuilder.php
+++ b/src/WireMock/Recording/RecordSpecBuilder.php
@@ -12,19 +12,19 @@ class RecordSpecBuilder
     private $requestPatternBuilder;
     /** @var string[] */
     private $requestIds;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $captureHeaders;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $extractBodyCriteria;
-    /** @var bool */
+    /** @var boolean */
     private $persist = true;
-    /** @var bool */
+    /** @var boolean */
     private $repeatsAsScenarios = true;
     /** @var string[]|null */
     private $transformers;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $transformerParameters;
-    /** @var array|null */
+    /** @var array<int|string, mixed>|null */
     private $requestBodyPattern;
     /** @var string|null */
     private $format = null;
@@ -32,7 +32,7 @@ class RecordSpecBuilder
     private $allowNonProxied = null;
 
     /**
-     * @param $targetBaseUrl
+     * @param string $targetBaseUrl
      * @return RecordSpecBuilder
      */
     public function forTarget($targetBaseUrl)
@@ -95,7 +95,7 @@ public function extractTextBodiesOver($bytes)
     }
 
     /**
-     * @param $persist
+     * @param bool $persist
      * @return RecordSpecBuilder
      */
     public function makeStubsPersistent($persist)
@@ -125,7 +125,7 @@ public function transformers()
     }
 
     /**
-     * @param $paramsArray
+     * @param array<int|string, mixed> $paramsArray
      * @return RecordSpecBuilder
      */
     public function transformerParameters($paramsArray)
diff --git a/src/WireMock/Serde/ArrayMapUtils.php b/src/WireMock/Serde/ArrayMapUtils.php
index 7cda224..fc2477a 100644
--- a/src/WireMock/Serde/ArrayMapUtils.php
+++ b/src/WireMock/Serde/ArrayMapUtils.php
@@ -6,8 +6,8 @@ class ArrayMapUtils
 {
     /**
      * @param callable $f Called with ($key, $value). Should return [newKey, newValue]
-     * @param array $a
-     * @return array
+     * @param array<int|string, mixed> $a
+     * @return array<int|string, mixed>
      */
     public static function array_map_assoc(callable $f, array $a): array
     {
diff --git a/src/WireMock/Serde/MethodFactory.php b/src/WireMock/Serde/MethodFactory.php
index 9b4aaf4..4d0d5d9 100644
--- a/src/WireMock/Serde/MethodFactory.php
+++ b/src/WireMock/Serde/MethodFactory.php
@@ -8,9 +8,10 @@
 
 class MethodFactory {
     /**
+     * @param string $fqMethodName
      * @throws ReflectionException
      */
-    public static function createMethod($fqMethodName) {
+    public static function createMethod($fqMethodName): ReflectionMethod {
         return PHP_VERSION_ID >= 80400
             ? ReflectionMethod::createFromMethodName($fqMethodName)
             : new ReflectionMethod($fqMethodName);
diff --git a/src/WireMock/Serde/SerdeClassDiscriminationInfo.php b/src/WireMock/Serde/SerdeClassDiscriminationInfo.php
index b2f2fc6..e65e324 100644
--- a/src/WireMock/Serde/SerdeClassDiscriminationInfo.php
+++ b/src/WireMock/Serde/SerdeClassDiscriminationInfo.php
@@ -20,7 +20,7 @@ class SerdeClassDiscriminationInfo
 
     /**
      * @param string $discriminatorFactoryName
-     * @param array $possibleSerdeTypes
+     * @param array<int|string, mixed> $possibleSerdeTypes
      * @throws SerializationException|ReflectionException
      */
     public function __construct(string $discriminatorFactoryName, array $possibleSerdeTypes)
diff --git a/src/WireMock/Serde/SerdeProp.php b/src/WireMock/Serde/SerdeProp.php
index 7ffea35..dbc47ea 100644
--- a/src/WireMock/Serde/SerdeProp.php
+++ b/src/WireMock/Serde/SerdeProp.php
@@ -19,11 +19,11 @@ class SerdeProp
     public $serdeType;
     /** @var PropertyNamingStrategy|null */
     public $propertyNamingStrategy;
-    /** @var bool */
+    /** @var boolean */
     public $unwrapped;
-    /** @var bool */
+    /** @var boolean */
     public $catchAll;
-    /** @var bool */
+    /** @var boolean */
     public $includeInNormalizedForm;
 
     /**
diff --git a/src/WireMock/Serde/StaticFactoryMethodValidator.php b/src/WireMock/Serde/StaticFactoryMethodValidator.php
index da05e47..20f8fa8 100644
--- a/src/WireMock/Serde/StaticFactoryMethodValidator.php
+++ b/src/WireMock/Serde/StaticFactoryMethodValidator.php
@@ -7,10 +7,11 @@
 class StaticFactoryMethodValidator
 {
     /**
+     * @param string $fqMethodName
      * @throws ReflectionException
      * @throws SerializationException
      */
-    public static function validate($fqMethodName) {
+    public static function validate($fqMethodName): void {
         $refMethod = MethodFactory::createMethod($fqMethodName);
         if (!$refMethod->isStatic()) {
             throw new SerializationException("$fqMethodName must be a static method but is not");
diff --git a/src/WireMock/Serde/Type/SerdeTypeAssocArray.php b/src/WireMock/Serde/Type/SerdeTypeAssocArray.php
index 70154f7..32c39fb 100644
--- a/src/WireMock/Serde/Type/SerdeTypeAssocArray.php
+++ b/src/WireMock/Serde/Type/SerdeTypeAssocArray.php
@@ -25,7 +25,7 @@ static function setKeyValueTypes(
         SerdeTypeAssocArray $arrayType,
         SerdeTypePrimitive $keySerdeType,
         SerdeType $valueSerdeType
-    ) {
+    ): void {
         $arrayType->keyType = $keySerdeType;
         $arrayType->valueType = $valueSerdeType;
     }
diff --git a/src/WireMock/Serde/Type/SerdeTypeClass.php b/src/WireMock/Serde/Type/SerdeTypeClass.php
index c23d029..6784de5 100644
--- a/src/WireMock/Serde/Type/SerdeTypeClass.php
+++ b/src/WireMock/Serde/Type/SerdeTypeClass.php
@@ -15,7 +15,7 @@ class SerdeTypeClass extends SerdeTypeSingle
     /** @var SerdeClassDefinition */
     private $classDefinition;
 
-    static function setClassDefinition(SerdeTypeClass $serdeType, SerdeClassDefinition $classDefinition)
+    static function setClassDefinition(SerdeTypeClass $serdeType, SerdeClassDefinition $classDefinition): void
     {
         $serdeType->classDefinition = $classDefinition;
     }
@@ -103,7 +103,7 @@ public function denormalize(&$data, array $path): ?object
 
     /**
      * @param $data
-     * @param array $path
+     * @param array<int|string, mixed> $path
      * @return object|null
      * @throws ReflectionException|SerializationException
      */
@@ -136,7 +136,7 @@ private function getDiscriminatedType($data): SerdeTypeClass
     /**
      * @throws ReflectionException
      */
-    private function reverseNamedByProps(array &$data)
+    private function reverseNamedByProps(array &$data): void
     {
         foreach ($this->classDefinition->getAllPropertiesAndArgs() as $prop) {
             $namingStrategy = $prop->propertyNamingStrategy;
@@ -157,7 +157,7 @@ private function reverseNamedByProps(array &$data)
         }
     }
 
-    private function reverseNamedProps(array &$data)
+    private function reverseNamedProps(array &$data): void
     {
         foreach ($this->classDefinition->getAllPropertiesAndArgs() as $prop) {
             $namingStrategy = $prop->propertyNamingStrategy;
@@ -176,7 +176,7 @@ private function reverseNamedProps(array &$data)
     /**
      * @throws SerializationException
      */
-    private function reverseUnwrappedProps(array &$data)
+    private function reverseUnwrappedProps(array &$data): void
     {
         foreach ($this->classDefinition->getAllPropertiesAndArgs() as $prop) {
             if (!$prop->unwrapped) {
@@ -208,7 +208,7 @@ private function reverseUnwrappedProps(array &$data)
     /**
      * @throws SerializationException
      */
-    private function reverseCatchAllProp(array &$data)
+    private function reverseCatchAllProp(array &$data): void
     {
         $prop = $this->classDefinition->getCatchAllProp();
         if ($prop === null) {
@@ -250,7 +250,7 @@ function($param) use (&$data, $path) {
      * @throws SerializationException
      * @throws ReflectionException
      */
-    private function populateObject(array &$data, object $object, array $path)
+    private function populateObject(array &$data, object $object, array $path): void
     {
         foreach ($data as $propertyName => $propertyData) {
             $serdeProp = $this->classDefinition->getPropertyByPhpName($propertyName);
diff --git a/src/WireMock/Serde/Type/SerdeTypeTypedArray.php b/src/WireMock/Serde/Type/SerdeTypeTypedArray.php
index 4bc25d5..22ae54f 100644
--- a/src/WireMock/Serde/Type/SerdeTypeTypedArray.php
+++ b/src/WireMock/Serde/Type/SerdeTypeTypedArray.php
@@ -17,7 +17,7 @@ public function __construct(SerdeType $type)
         $this->type = $type;
     }
 
-    static function setInnerType(SerdeTypeTypedArray $serdeType, SerdeType $type)
+    static function setInnerType(SerdeTypeTypedArray $serdeType, SerdeType $type): void
     {
         $serdeType->type = $type;
     }
diff --git a/src/WireMock/Serde/Type/SerdeTypeUnion.php b/src/WireMock/Serde/Type/SerdeTypeUnion.php
index 8bc754d..5dee44b 100644
--- a/src/WireMock/Serde/Type/SerdeTypeUnion.php
+++ b/src/WireMock/Serde/Type/SerdeTypeUnion.php
@@ -22,7 +22,11 @@ public function __construct(array $primitiveSerdeTypes, $classOrArraySerdeType)
         $this->classOrArraySerdeType = $classOrArraySerdeType;
     }
 
-    static function setSubtypes(SerdeTypeUnion $serdeType, array $primitiveSerdeTypes, $classOrArraySerdeType)
+    /**
+     * @param SerdeTypePrimitive[] $primitiveSerdeTypes
+     * @param SerdeTypeArray|SerdeTypeClass|null $classOrArraySerdeType
+     */
+    static function setSubtypes(SerdeTypeUnion $serdeType, array $primitiveSerdeTypes, $classOrArraySerdeType): void
     {
         $serdeType->primitiveSerdeTypes = $primitiveSerdeTypes;
         $serdeType->classOrArraySerdeType = $classOrArraySerdeType;
diff --git a/src/WireMock/SerdeGen/PartialSerdeTypeLookup.php b/src/WireMock/SerdeGen/PartialSerdeTypeLookup.php
index 422c3c2..882d28e 100644
--- a/src/WireMock/SerdeGen/PartialSerdeTypeLookup.php
+++ b/src/WireMock/SerdeGen/PartialSerdeTypeLookup.php
@@ -15,7 +15,10 @@ public function __construct()
         parent::__construct([], []);
     }
 
-    public function addRootTypes(...$types)
+    /**
+     * @param string ...$types
+     */
+    public function addRootTypes(...$types): void
     {
         foreach ($types as $type) {
             $key = CanonicalNameUtils::stripLeadingBackslashIfNeeded($type);
@@ -37,7 +40,7 @@ public function addSerdeTypeIfNeeded(string $type, SerdeType $serdeType, bool $i
         return $this->getSerdeType($type);
     }
 
-    private function addSerdeType(string $type, SerdeType $serdeType)
+    private function addSerdeType(string $type, SerdeType $serdeType): void
     {
         $key = CanonicalNameUtils::stripLeadingBackslashIfNeeded($type);
         $this->lookup[$key] = $serdeType;
diff --git a/src/WireMock/SerdeGen/SerdeClassDefinitionFactory.php b/src/WireMock/SerdeGen/SerdeClassDefinitionFactory.php
index d4de5d6..4b76e3f 100644
--- a/src/WireMock/SerdeGen/SerdeClassDefinitionFactory.php
+++ b/src/WireMock/SerdeGen/SerdeClassDefinitionFactory.php
@@ -2,6 +2,7 @@
 
 namespace WireMock\SerdeGen;
 
+use http\Exception\RuntimeException;
 use phpDocumentor\Reflection\DocBlock;
 use phpDocumentor\Reflection\DocBlock\Tags\Param;
 use phpDocumentor\Reflection\DocBlock\Tags\Var_;
@@ -49,6 +50,7 @@ public function __construct(SerdeTypeParser $serdeTypeParser)
 
     /**
      * @throws SerializationException|ReflectionException
+     * @param string $classType
      */
     public function createClassDefinition(string $classType, bool $isRootType): SerdeClassDefinition
     {
@@ -106,6 +108,7 @@ private function getClassDiscriminationInfo(ReflectionClass $refClass, Context $
      */
     private function getProperties(ReflectionClass $refClass, Context $context): array
     {
+        $parentClass = $refClass->getName();
         $refProps = [];
         do {
             // Merge the props, ignoring antecedent props that have already been defined on descendants
@@ -123,7 +126,11 @@ private function getProperties(ReflectionClass $refClass, Context $context): arr
                 continue;
             }
             $propName = $refProp->getName();
-            $docBlock = $this->docBlockFactory->create($refProp, $context);
+            try {
+                $docBlock = $this->docBlockFactory->create($refProp, $context);
+            } catch (\Webmozart\Assert\InvalidArgumentException $e) {
+                throw new SerializationException('Missing docblock in '.$parentClass.'::$'.$refProp->getName(), 0, $e);
+            }
 
             $varTags = $docBlock->getTagsByName('var');
             if (count($varTags) !== 1) {
@@ -132,7 +139,11 @@ private function getProperties(ReflectionClass $refClass, Context $context): arr
             }
             /** @var Var_ $varTag */
             $varTag = $varTags[0];
-            $propType = $this->serdeTypeParser->resolveTypeToSerdeType($varTag->getType());
+            try {
+                $propType = $this->serdeTypeParser->resolveTypeToSerdeType($varTag->getType());
+            } catch (SerializationException $e) {
+                throw new SerializationException('Cannot resolve type from '.$parentClass.'::$'.$refProp->getName().' with @var of '.$varTag->getType(), 0, $e);
+            }
 
             /** @var SerdeNameTag|null $serdeNameTag */
             $serdeNameTag = $this->getSinglePropTagIfPresent($docBlock, 'serde-name', $propName);
diff --git a/src/WireMock/SerdeGen/SerdeTypeLookupFactory.php b/src/WireMock/SerdeGen/SerdeTypeLookupFactory.php
index 7a7df70..32c7ac7 100644
--- a/src/WireMock/SerdeGen/SerdeTypeLookupFactory.php
+++ b/src/WireMock/SerdeGen/SerdeTypeLookupFactory.php
@@ -12,10 +12,10 @@ class SerdeTypeLookupFactory
     /**
      * @throws ReflectionException|SerializationException
      */
-    public static function createLookup(...$types): SerdeTypeLookup
+    public static function createLookup(string ...$types): SerdeTypeLookup
     {
         $partialLookup = new PartialSerdeTypeLookup();
-        $canonicalTypes = array_map(function($fqn) {
+        $canonicalTypes = array_map(function(string $fqn) {
             return CanonicalNameUtils::stripLeadingBackslashIfNeeded($fqn);
         }, $types);
         $partialLookup->addRootTypes(...$canonicalTypes);
diff --git a/src/WireMock/SerdeGen/SerdeTypeParser.php b/src/WireMock/SerdeGen/SerdeTypeParser.php
index 9ccf1f1..cf10a8f 100644
--- a/src/WireMock/SerdeGen/SerdeTypeParser.php
+++ b/src/WireMock/SerdeGen/SerdeTypeParser.php
@@ -8,14 +8,14 @@
 use phpDocumentor\Reflection\Types\Boolean;
 use phpDocumentor\Reflection\Types\Compound;
 use phpDocumentor\Reflection\Types\Expression;
-use phpDocumentor\Reflection\Types\False_;
+use phpDocumentor\Reflection\PseudoTypes\False_;
 use phpDocumentor\Reflection\Types\Float_;
 use phpDocumentor\Reflection\Types\Integer;
 use phpDocumentor\Reflection\Types\Null_;
 use phpDocumentor\Reflection\Types\Nullable;
 use phpDocumentor\Reflection\Types\Object_;
 use phpDocumentor\Reflection\Types\String_;
-use phpDocumentor\Reflection\Types\True_;
+use phpDocumentor\Reflection\PseudoTypes\True_;
 use ReflectionException;
 use WireMock\Serde\SerdeClassDefinition;
 use WireMock\Serde\SerializationException;
diff --git a/src/WireMock/SerdeGen/Tag/SerdeCatchAllTag.php b/src/WireMock/SerdeGen/Tag/SerdeCatchAllTag.php
index 81755ae..7363e50 100644
--- a/src/WireMock/SerdeGen/Tag/SerdeCatchAllTag.php
+++ b/src/WireMock/SerdeGen/Tag/SerdeCatchAllTag.php
@@ -7,9 +7,9 @@
 
 class SerdeCatchAllTag implements Tag
 {
-    public static function create(string $body)
+    public static function create(string $body): self
     {
-        return new static();
+        return new self();
     }
 
     public function getName(): string
diff --git a/src/WireMock/SerdeGen/Tag/SerdeDiscriminateTypeTag.php b/src/WireMock/SerdeGen/Tag/SerdeDiscriminateTypeTag.php
index 9630665..d32f37a 100644
--- a/src/WireMock/SerdeGen/Tag/SerdeDiscriminateTypeTag.php
+++ b/src/WireMock/SerdeGen/Tag/SerdeDiscriminateTypeTag.php
@@ -18,9 +18,9 @@ public function __construct(string $discriminatorFactory)
         $this->discriminatorFactory = $discriminatorFactory;
     }
 
-    public static function create(string $body)
+    public static function create(string $body): self
     {
-        return new static(trim($body));
+        return new self(trim($body));
     }
 
     public function getName(): string
diff --git a/src/WireMock/SerdeGen/Tag/SerdeNameTag.php b/src/WireMock/SerdeGen/Tag/SerdeNameTag.php
index 0e2dee9..0ffff23 100644
--- a/src/WireMock/SerdeGen/Tag/SerdeNameTag.php
+++ b/src/WireMock/SerdeGen/Tag/SerdeNameTag.php
@@ -18,10 +18,10 @@ public function __construct(string $serializedPropertyName)
         $this->serializedPropertyName = $serializedPropertyName;
     }
 
-    public static function create(string $body)
+    public static function create(string $body): self
     {
         $propName = trim($body);
-        return new static($propName);
+        return new self($propName);
     }
 
     public function getName(): string
diff --git a/src/WireMock/SerdeGen/Tag/SerdeNamedByTag.php b/src/WireMock/SerdeGen/Tag/SerdeNamedByTag.php
index 64a5d18..77bf686 100644
--- a/src/WireMock/SerdeGen/Tag/SerdeNamedByTag.php
+++ b/src/WireMock/SerdeGen/Tag/SerdeNamedByTag.php
@@ -18,10 +18,10 @@ public function __construct(string $namingPropertyName)
         $this->namingPropertyName = $namingPropertyName;
     }
 
-    public static function create(string $body)
+    public static function create(string $body): self
     {
         $propName = trim($body);
-        return new static($propName);
+        return new self($propName);
     }
 
     public function getName(): string
diff --git a/src/WireMock/SerdeGen/Tag/SerdePossibleNamesTag.php b/src/WireMock/SerdeGen/Tag/SerdePossibleNamesTag.php
index 5069b62..c2a543c 100644
--- a/src/WireMock/SerdeGen/Tag/SerdePossibleNamesTag.php
+++ b/src/WireMock/SerdeGen/Tag/SerdePossibleNamesTag.php
@@ -18,10 +18,10 @@ public function __construct(string $possibleNamesGenerator)
         $this->possibleNamesGenerator = $possibleNamesGenerator;
     }
 
-    public static function create(string $body)
+    public static function create(string $body): self
     {
         $propName = trim($body);
-        return new static($propName);
+        return new self($propName);
     }
 
     public function getName(): string
diff --git a/src/WireMock/SerdeGen/Tag/SerdePossibleSubtypeTag.php b/src/WireMock/SerdeGen/Tag/SerdePossibleSubtypeTag.php
index f5301ca..3e5ffac 100644
--- a/src/WireMock/SerdeGen/Tag/SerdePossibleSubtypeTag.php
+++ b/src/WireMock/SerdeGen/Tag/SerdePossibleSubtypeTag.php
@@ -25,7 +25,7 @@ public static function create(string $body, ?TypeResolver $typeResolver = null,
         $type = $typeResolver->resolve($typeName, $context);
         $description = new Description($body);
 
-        return new static($type, $description);
+        return new self($type, $description);
     }
 
     public function __toString(): string
diff --git a/src/WireMock/SerdeGen/Tag/SerdeUnwrappedTag.php b/src/WireMock/SerdeGen/Tag/SerdeUnwrappedTag.php
index 5c48854..945996f 100644
--- a/src/WireMock/SerdeGen/Tag/SerdeUnwrappedTag.php
+++ b/src/WireMock/SerdeGen/Tag/SerdeUnwrappedTag.php
@@ -7,9 +7,9 @@
 
 class SerdeUnwrappedTag implements Tag
 {
-    public static function create(string $body)
+    public static function create(string $body): self
     {
-        return new static();
+        return new self();
     }
 
     public function getName(): string
diff --git a/src/WireMock/SerdeGen/WireMockSerdeGen.php b/src/WireMock/SerdeGen/WireMockSerdeGen.php
index 80b7e8f..61e1d66 100644
--- a/src/WireMock/SerdeGen/WireMockSerdeGen.php
+++ b/src/WireMock/SerdeGen/WireMockSerdeGen.php
@@ -65,7 +65,7 @@ public static function generateSerializedWiremockSerdeLookup(): string
      * @throws ReflectionException
      * @throws SerializationException
      */
-    public static function generateAndSaveWireMockSerdeLookup()
+    public static function generateAndSaveWireMockSerdeLookup(): void
     {
         $lookupSerialized = self::generateSerializedWiremockSerdeLookup();
 
diff --git a/src/WireMock/Stubbing/ScenarioMapping.php b/src/WireMock/Stubbing/ScenarioMapping.php
index dffdf50..87025e4 100644
--- a/src/WireMock/Stubbing/ScenarioMapping.php
+++ b/src/WireMock/Stubbing/ScenarioMapping.php
@@ -4,17 +4,17 @@
 
 class ScenarioMapping
 {
-    /** @var string */
+    /** @var string|null */
     private $scenarioName;
-    /** @var string */
+    /** @var string|null */
     private $requiredScenarioState;
-    /** @var string */
+    /** @var string|null */
     private $newScenarioState;
 
     /**
-     * @param string $scenarioName
-     * @param string $requiredScenarioState
-     * @param string $newScenarioState
+     * @param string|null $scenarioName
+     * @param string|null $requiredScenarioState
+     * @param string|null $newScenarioState
      */
     public function __construct(
         $scenarioName = null,
@@ -28,7 +28,7 @@ public function __construct(
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getScenarioName()
     {
@@ -36,7 +36,7 @@ public function getScenarioName()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getRequiredScenarioState()
     {
@@ -44,7 +44,7 @@ public function getRequiredScenarioState()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getNewScenarioState()
     {
diff --git a/src/WireMock/Stubbing/StubMapping.php b/src/WireMock/Stubbing/StubMapping.php
index e809ae0..0446e5f 100644
--- a/src/WireMock/Stubbing/StubMapping.php
+++ b/src/WireMock/Stubbing/StubMapping.php
@@ -8,26 +8,26 @@
 
 class StubMapping
 {
-    /** @var string A string representation of a GUID */
+    /** @var ?string A string representation of a GUID */
     private $id;
-    /** @var string */
+    /** @var ?string */
     private $name;
     /** @var RequestPattern */
     private $request;
     /** @var ResponseDefinition */
     private $response;
-    /** @var int */
+    /** @var ?int */
     private $priority;
-    /** @var ?array */
+    /** @var array<string, int|string>|null */
     private $metadata;
-    /** @var boolean */
+    /** @var ?boolean */
     private $persistent;
 
-    /** @var string */
+    /** @var string|null */
     private $scenarioName;
-    /** @var string */
+    /** @var string|null */
     private $requiredScenarioState;
-    /** @var string */
+    /** @var string|null */
     private $newScenarioState;
     /** @var PostServeAction[]|null */
     private $postServeActions;
@@ -35,13 +35,13 @@ class StubMapping
     /**
      * @param RequestPattern $request
      * @param ResponseDefinition $response
-     * @param string $id
-     * @param string $name
-     * @param int $priority
+     * @param ?string $id
+     * @param ?string $name
+     * @param ?int $priority
      * @param ScenarioMapping|null $scenarioMapping
-     * @param array $metadata
-     * @param boolean $persistent
-     * @param array|null $postServeActions
+     * @param array<int|string, mixed>|null $metadata
+     * @param ?boolean $persistent
+     * @param array<int|string, mixed>|null $postServeActions
      */
     public function __construct(
         RequestPattern $request,
@@ -72,7 +72,7 @@ public function __construct(
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getId()
     {
@@ -80,9 +80,9 @@ public function getId()
     }
 
     /**
-     * @param string $id
+     * @param string|null $id
      */
-    public function setId($id)
+    public function setId($id): void
     {
         $this->id = $id;
     }
@@ -112,7 +112,7 @@ public function getResponse()
     }
 
     /**
-     * @return int
+     * @return int|null
      */
     public function getPriority()
     {
@@ -120,7 +120,7 @@ public function getPriority()
     }
 
     /**
-     * @return array
+     * @return array<int|string, mixed>|null
      */
     public function getMetadata()
     {
@@ -136,7 +136,7 @@ public function isPersistent()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getScenarioName()
     {
@@ -144,7 +144,7 @@ public function getScenarioName()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getRequiredScenarioState()
     {
@@ -152,7 +152,7 @@ public function getRequiredScenarioState()
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getNewScenarioState()
     {
diff --git a/src/WireMock/Verification/CountMatchingStrategy.php b/src/WireMock/Verification/CountMatchingStrategy.php
index de5713e..dc0a2d9 100644
--- a/src/WireMock/Verification/CountMatchingStrategy.php
+++ b/src/WireMock/Verification/CountMatchingStrategy.php
@@ -4,13 +4,16 @@
 
 class CountMatchingStrategy
 {
+    /** @var callable(int): bool */
     private $closure;
+    /** @var string */
     private $operator;
+    /** @var int */
     private $operand;
 
     /**
      * CountMatchingStrategy constructor.
-     * @param callable $closure Closure that takes an int and returns a boolean
+     * @param callable(int): bool $closure Closure that takes an int and returns a boolean
      * @param string $operator
      * @param int $operand
      */
@@ -23,7 +26,7 @@ private function __construct($closure, $operator, $operand)
 
     /**
      * @param int $count
-     * @return boolean
+     * @return bool
      */
     public function matches($count)
     {
@@ -31,28 +34,38 @@ public function matches($count)
         return $closure($count);
     }
 
-    public function describe()
+    public function describe(): string
     {
         return $this->operator . ' ' . $this->operand;
     }
 
-    public static function lessThan($expected) {
+    /** @param int $expected */
+    public static function lessThan($expected): self
+    {
         return new self(function($actual) use ($expected) { return $actual < $expected; }, '<', $expected);
     }
 
-    public static function lessThanOrExactly($expected) {
+    /** @param int $expected */
+    public static function lessThanOrExactly($expected): self
+    {
         return new self(function($actual) use ($expected) { return $actual <= $expected; }, '<=', $expected);
     }
 
-    public static function exactly($expected) {
+    /** @param int $expected */
+    public static function exactly($expected): self
+    {
         return new self(function($actual) use ($expected) { return $actual == $expected; }, '==', $expected);
     }
 
-    public static function moreThanOrExactly($expected) {
+    /** @param int $expected */
+    public static function moreThanOrExactly($expected): self
+    {
         return new self(function($actual) use ($expected) { return $actual >= $expected; }, '>=', $expected);
     }
 
-    public static function moreThan($expected) {
+    /** @param int $expected */
+    public static function moreThan($expected): self
+    {
         return new self(function($actual) use ($expected) { return $actual > $expected; }, '>', $expected);
     }
 }
\ No newline at end of file
diff --git a/test/WireMock/Integration/FaultsAndDelaysIntegrationTest.php b/test/WireMock/Integration/FaultsAndDelaysIntegrationTest.php
index c434760..741ef85 100644
--- a/test/WireMock/Integration/FaultsAndDelaysIntegrationTest.php
+++ b/test/WireMock/Integration/FaultsAndDelaysIntegrationTest.php
@@ -8,6 +8,9 @@
 use WireMock\Fault\UniformDistribution;
 use WireMock\Stubbing\Fault;
 
+/**
+ * @group integration
+ */
 class FaultsAndDelaysIntegrationTest extends WireMockIntegrationTest
 {
     protected function tearDown(): void
diff --git a/test/WireMock/Integration/MappingsIntegrationTest.php b/test/WireMock/Integration/MappingsIntegrationTest.php
index 1641ffc..fd7085b 100644
--- a/test/WireMock/Integration/MappingsIntegrationTest.php
+++ b/test/WireMock/Integration/MappingsIntegrationTest.php
@@ -4,6 +4,9 @@
 
 use WireMock\Client\WireMock;
 
+/**
+ * @group integration
+ */
 class MappingsIntegrationTest extends WireMockIntegrationTest
 {
     public function testMappingsListIsEmptyIfNoStubsHaveBeenMade()
diff --git a/test/WireMock/Integration/MultipartIntegrationTest.php b/test/WireMock/Integration/MultipartIntegrationTest.php
index 7aa6137..6389bbf 100644
--- a/test/WireMock/Integration/MultipartIntegrationTest.php
+++ b/test/WireMock/Integration/MultipartIntegrationTest.php
@@ -5,6 +5,9 @@
 use WireMock\Client\MultipartValuePattern;
 use WireMock\Client\WireMock;
 
+/**
+ * @group integration
+ */
 class MultipartIntegrationTest extends WireMockIntegrationTest
 {
     public function testSimpleMultipartStubCanBeRegistered()
diff --git a/test/WireMock/Integration/NearMissesIntegrationTest.php b/test/WireMock/Integration/NearMissesIntegrationTest.php
index beec133..6b3e3de 100644
--- a/test/WireMock/Integration/NearMissesIntegrationTest.php
+++ b/test/WireMock/Integration/NearMissesIntegrationTest.php
@@ -4,6 +4,9 @@
 
 use WireMock\Client\WireMock;
 
+/**
+ * @group integration
+ */
 class NearMissesIntegrationTest extends WireMockIntegrationTest
 {
     public function testFindNearMissesForLoggedRequest()
diff --git a/test/WireMock/Integration/ProxyingIntegrationTest.php b/test/WireMock/Integration/ProxyingIntegrationTest.php
index 502b63d..4768496 100644
--- a/test/WireMock/Integration/ProxyingIntegrationTest.php
+++ b/test/WireMock/Integration/ProxyingIntegrationTest.php
@@ -4,6 +4,9 @@
 
 use WireMock\Client\WireMock;
 
+/**
+ * @group integration
+ */
 class ProxyingIntegrationTest extends WireMockIntegrationTest
 {
     public function testProxyBaseUrlOfStubCanBeSet()
diff --git a/test/WireMock/Integration/RecordingIntegrationTest.php b/test/WireMock/Integration/RecordingIntegrationTest.php
index dd1d139..bd4058d 100644
--- a/test/WireMock/Integration/RecordingIntegrationTest.php
+++ b/test/WireMock/Integration/RecordingIntegrationTest.php
@@ -8,6 +8,9 @@
 use WireMock\Recording\RecordingStatusResult;
 use WireMock\Recording\RecordSpec;
 
+/**
+ * @group integration
+ */
 class RecordingIntegrationTest extends WireMockIntegrationTest
 {
     /** @var WireMock */
diff --git a/test/WireMock/Integration/RequestsIntegrationTest.php b/test/WireMock/Integration/RequestsIntegrationTest.php
index 28af8c8..e644d03 100644
--- a/test/WireMock/Integration/RequestsIntegrationTest.php
+++ b/test/WireMock/Integration/RequestsIntegrationTest.php
@@ -9,6 +9,9 @@
 use WireMock\Client\ServeEventQuery;
 use WireMock\Client\WireMock;
 
+/**
+ * @group integration
+ */
 class RequestsIntegrationTest extends WireMockIntegrationTest
 {
     public function testGettingAllServeEventsReturnsAllRequestDetails()
diff --git a/test/WireMock/Integration/ScenarioIntegrationTest.php b/test/WireMock/Integration/ScenarioIntegrationTest.php
index b49e0da..633b3d9 100644
--- a/test/WireMock/Integration/ScenarioIntegrationTest.php
+++ b/test/WireMock/Integration/ScenarioIntegrationTest.php
@@ -5,6 +5,9 @@
 use WireMock\Client\WireMock;
 use WireMock\Stubbing\Scenario;
 
+/**
+ * @group integration
+ */
 class ScenarioIntegrationTest extends WireMockIntegrationTest
 {
     public function testScenarioNameOfStubCanBeSet()
diff --git a/test/WireMock/Integration/ShutdownIntegrationTest.php b/test/WireMock/Integration/ShutdownIntegrationTest.php
index cbc0321..e406b8e 100644
--- a/test/WireMock/Integration/ShutdownIntegrationTest.php
+++ b/test/WireMock/Integration/ShutdownIntegrationTest.php
@@ -2,6 +2,9 @@
 
 namespace WireMock\Integration;
 
+/**
+ * @group integration
+ */
 class ShutdownIntegrationTest extends WireMockIntegrationTest
 {
     public function testShutdownTerminatesStandaloneServer()
diff --git a/test/WireMock/Integration/StubbingIntegrationTest.php b/test/WireMock/Integration/StubbingIntegrationTest.php
index 3aaaa60..3e4b794 100644
--- a/test/WireMock/Integration/StubbingIntegrationTest.php
+++ b/test/WireMock/Integration/StubbingIntegrationTest.php
@@ -11,6 +11,9 @@
 use WireMock\Client\XmlUnitComparisonType;
 use WireMock\Stubbing\StubMapping;
 
+/**
+ * @group integration
+ */
 class StubbingIntegrationTest extends WireMockIntegrationTest
 {
     public function setUp(): void
diff --git a/test/WireMock/Integration/VerificationIntegrationTest.php b/test/WireMock/Integration/VerificationIntegrationTest.php
index f388e46..6a6f6c5 100644
--- a/test/WireMock/Integration/VerificationIntegrationTest.php
+++ b/test/WireMock/Integration/VerificationIntegrationTest.php
@@ -6,6 +6,9 @@
 use WireMock\Client\VerificationException;
 use WireMock\Client\WireMock;
 
+/**
+ * @group integration
+ */
 class VerificationIntegrationTest extends WireMockIntegrationTest
 {
     private $_verificationCount = 0;
diff --git a/test/WireMock/Integration/WebhookIntegrationTest.php b/test/WireMock/Integration/WebhookIntegrationTest.php
index 370dbfd..e7e1aa4 100644
--- a/test/WireMock/Integration/WebhookIntegrationTest.php
+++ b/test/WireMock/Integration/WebhookIntegrationTest.php
@@ -5,6 +5,9 @@
 use WireMock\Client\WireMock;
 use WireMock\Http\RequestMethod;
 
+/**
+ * @group integration
+ */
 class WebhookIntegrationTest extends WireMockIntegrationTest
 {
     public function testWebhookCallbackCanBeRegistered()
diff --git a/test/WireMock/Serde/TestClasses/ConstructorParams.php b/test/WireMock/Serde/TestClasses/ConstructorParams.php
index c76349f..45c1b24 100644
--- a/test/WireMock/Serde/TestClasses/ConstructorParams.php
+++ b/test/WireMock/Serde/TestClasses/ConstructorParams.php
@@ -6,7 +6,7 @@ class ConstructorParams
 {
     /** @var int */
     private $fieldWithConstructorParam;
-    /** @var bool */
+    /** @var boolean */
     private $fieldWithOptionalConstructorParam;
 
     /**
diff --git a/test/WireMock/Serde/TestClasses/DiscriminatedTypeParent.php b/test/WireMock/Serde/TestClasses/DiscriminatedTypeParent.php
index 758c5e9..fa76de4 100644
--- a/test/WireMock/Serde/TestClasses/DiscriminatedTypeParent.php
+++ b/test/WireMock/Serde/TestClasses/DiscriminatedTypeParent.php
@@ -20,7 +20,8 @@ public function __construct(string $type)
         $this->type = $type;
     }
 
-    private static function getDiscriminatorMapping()
+    /** @noinspection PhpUnusedPrivateMethodInspection */
+    private static function getDiscriminatorMapping() // @phpstan-ignore method.unused
     {
         return new ClassDiscriminatorMapping('type', [
             'parent' => DiscriminatedTypeParent::class,
diff --git a/test/WireMock/Serde/TestClasses/FieldOnlyPrimitives.php b/test/WireMock/Serde/TestClasses/FieldOnlyPrimitives.php
index 311eea7..1ca7a60 100644
--- a/test/WireMock/Serde/TestClasses/FieldOnlyPrimitives.php
+++ b/test/WireMock/Serde/TestClasses/FieldOnlyPrimitives.php
@@ -8,7 +8,7 @@ class FieldOnlyPrimitives
     private $int;
     /** @var float */
     private $float;
-    /** @var bool */
+    /** @var boolean */
     private $bool;
     /** @var string */
     private $string;
diff --git a/test/WireMock/Serde/TestClasses/UnionTypeFields.php b/test/WireMock/Serde/TestClasses/UnionTypeFields.php
index 75b6156..b72fd3e 100644
--- a/test/WireMock/Serde/TestClasses/UnionTypeFields.php
+++ b/test/WireMock/Serde/TestClasses/UnionTypeFields.php
@@ -14,7 +14,7 @@ class UnionTypeFields
     private $arrayOfUnion;
 
     /**
-     * @param bool|int|string $primitivesUnion
+     * @param boolean|int|string $primitivesUnion
      * @param int|int[] $arrayUnion
      * @param float|DefaultedField $classUnion
      * @param (string|int)[] $arrayOfUnion
diff --git a/test/WireMock/SerdeGen/TestClasses/KitchenSink.php b/test/WireMock/SerdeGen/TestClasses/KitchenSink.php
index 3effd0c..e4f7e8b 100644
--- a/test/WireMock/SerdeGen/TestClasses/KitchenSink.php
+++ b/test/WireMock/SerdeGen/TestClasses/KitchenSink.php
@@ -18,7 +18,7 @@ private static function discriminate() {}
     private $reqArg;
 
     /**
-     * @var bool
+     * @var boolean
      * @serde-name renamed
      */
     private $originalName;