diff --git a/.travis.yml b/.travis.yml
index 686e3ba..68b7076 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,3 +24,4 @@ install:
 script:
   - vendor/bin/phpunit
   - vendor/bin/phpcs .
+  - vendor/bin/psalm --show-info=false
diff --git a/Behavioral/ChainOfResponsibilities/Tests/ChainTest.php b/Behavioral/ChainOfResponsibilities/Tests/ChainTest.php
index 2dd6eb2..8923d3b 100644
--- a/Behavioral/ChainOfResponsibilities/Tests/ChainTest.php
+++ b/Behavioral/ChainOfResponsibilities/Tests/ChainTest.php
@@ -5,7 +5,10 @@ namespace DesignPatterns\Behavioral\ChainOfResponsibilities\Tests;
 use DesignPatterns\Behavioral\ChainOfResponsibilities\Handler;
 use DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible\HttpInMemoryCacheHandler;
 use DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible\SlowDatabaseHandler;
+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\UriInterface;
 
 class ChainTest extends TestCase
 {
@@ -24,11 +27,11 @@ class ChainTest extends TestCase
 
     public function testCanRequestKeyInFastStorage()
     {
-        $uri = $this->createMock('Psr\Http\Message\UriInterface');
+        $uri = $this->createMock(UriInterface::class);
         $uri->method('getPath')->willReturn('/foo/bar');
         $uri->method('getQuery')->willReturn('index=1');
 
-        $request = $this->createMock('Psr\Http\Message\RequestInterface');
+        $request = $this->createMock(RequestInterface::class);
         $request->method('getMethod')
             ->willReturn('GET');
         $request->method('getUri')->willReturn($uri);
@@ -38,11 +41,11 @@ class ChainTest extends TestCase
 
     public function testCanRequestKeyInSlowStorage()
     {
-        $uri = $this->createMock('Psr\Http\Message\UriInterface');
+        $uri = $this->createMock(UriInterface::class);
         $uri->method('getPath')->willReturn('/foo/baz');
         $uri->method('getQuery')->willReturn('');
 
-        $request = $this->createMock('Psr\Http\Message\RequestInterface');
+        $request = $this->createMock(RequestInterface::class);
         $request->method('getMethod')
             ->willReturn('GET');
         $request->method('getUri')->willReturn($uri);
diff --git a/Behavioral/Observer/UserObserver.php b/Behavioral/Observer/UserObserver.php
index 4ecd107..c06863f 100644
--- a/Behavioral/Observer/UserObserver.php
+++ b/Behavioral/Observer/UserObserver.php
@@ -2,25 +2,27 @@
 
 namespace DesignPatterns\Behavioral\Observer;
 
+use SplSubject;
+
 class UserObserver implements \SplObserver
 {
     /**
-     * @var User[]
+     * @var SplSubject[]
      */
     private $changedUsers = [];
 
     /**
      * It is called by the Subject, usually by SplSubject::notify()
      *
-     * @param \SplSubject $subject
+     * @param SplSubject $subject
      */
-    public function update(\SplSubject $subject)
+    public function update(SplSubject $subject)
     {
         $this->changedUsers[] = clone $subject;
     }
 
     /**
-     * @return User[]
+     * @return SplSubject[]
      */
     public function getChangedUsers(): array
     {
diff --git a/Behavioral/Specification/AndSpecification.php b/Behavioral/Specification/AndSpecification.php
index 700b499..677deb1 100644
--- a/Behavioral/Specification/AndSpecification.php
+++ b/Behavioral/Specification/AndSpecification.php
@@ -10,7 +10,7 @@ class AndSpecification implements Specification
     private $specifications;
 
     /**
-     * @param Specification[] ...$specifications
+     * @param Specification[] $specifications
      */
     public function __construct(Specification ...$specifications)
     {
diff --git a/Behavioral/Specification/OrSpecification.php b/Behavioral/Specification/OrSpecification.php
index 722f5bd..5307d47 100644
--- a/Behavioral/Specification/OrSpecification.php
+++ b/Behavioral/Specification/OrSpecification.php
@@ -10,14 +10,14 @@ class OrSpecification implements Specification
     private $specifications;
 
     /**
-     * @param Specification[] ...$specifications
+     * @param Specification[] $specifications
      */
     public function __construct(Specification ...$specifications)
     {
         $this->specifications = $specifications;
     }
 
-    /**
+    /*
      * if at least one specification is true, return true, else return false
      */
     public function isSatisfiedBy(Item $item): bool
diff --git a/Creational/AbstractFactory/ShippableProduct.php b/Creational/AbstractFactory/ShippableProduct.php
index 6979311..3521bd5 100644
--- a/Creational/AbstractFactory/ShippableProduct.php
+++ b/Creational/AbstractFactory/ShippableProduct.php
@@ -5,12 +5,12 @@ namespace DesignPatterns\Creational\AbstractFactory;
 class ShippableProduct implements Product
 {
     /**
-     * @var float
+     * @var int
      */
     private $productPrice;
 
     /**
-     * @var float
+     * @var int
      */
     private $shippingCosts;
 
diff --git a/Creational/StaticFactory/FormatNumber.php b/Creational/StaticFactory/FormatNumber.php
index 98be4e8..c6231e0 100644
--- a/Creational/StaticFactory/FormatNumber.php
+++ b/Creational/StaticFactory/FormatNumber.php
@@ -6,6 +6,6 @@ class FormatNumber implements Formatter
 {
     public function format(string $input): string
     {
-        return number_format($input);
+        return number_format((int) $input);
     }
 }
diff --git a/Creational/StaticFactory/Tests/StaticFactoryTest.php b/Creational/StaticFactory/Tests/StaticFactoryTest.php
index b289192..70646ef 100644
--- a/Creational/StaticFactory/Tests/StaticFactoryTest.php
+++ b/Creational/StaticFactory/Tests/StaticFactoryTest.php
@@ -2,6 +2,8 @@
 
 namespace DesignPatterns\Creational\StaticFactory\Tests;
 
+use DesignPatterns\Creational\StaticFactory\FormatNumber;
+use DesignPatterns\Creational\StaticFactory\FormatString;
 use DesignPatterns\Creational\StaticFactory\StaticFactory;
 use PHPUnit\Framework\TestCase;
 
@@ -9,18 +11,12 @@ class StaticFactoryTest extends TestCase
 {
     public function testCanCreateNumberFormatter()
     {
-        $this->assertInstanceOf(
-            'DesignPatterns\Creational\StaticFactory\FormatNumber',
-            StaticFactory::factory('number')
-        );
+        $this->assertInstanceOf(FormatNumber::class, StaticFactory::factory('number'));
     }
 
     public function testCanCreateStringFormatter()
     {
-        $this->assertInstanceOf(
-            'DesignPatterns\Creational\StaticFactory\FormatString',
-            StaticFactory::factory('string')
-        );
+        $this->assertInstanceOf(FormatString::class, StaticFactory::factory('string'));
     }
 
     public function testException()
diff --git a/More/EAV/Entity.php b/More/EAV/Entity.php
index cda0389..7e8724c 100644
--- a/More/EAV/Entity.php
+++ b/More/EAV/Entity.php
@@ -2,10 +2,12 @@
 
 namespace DesignPatterns\More\EAV;
 
+use SplObjectStorage;
+
 class Entity
 {
     /**
-     * @var \SplObjectStorage
+     * @var SplObjectStorage<Value,Value>
      */
     private $values;
 
@@ -20,7 +22,7 @@ class Entity
      */
     public function __construct(string $name, $values)
     {
-        $this->values = new \SplObjectStorage();
+        $this->values = new SplObjectStorage();
         $this->name = $name;
 
         foreach ($values as $value) {
diff --git a/More/EAV/Value.php b/More/EAV/Value.php
index 4e993aa..b5423b8 100644
--- a/More/EAV/Value.php
+++ b/More/EAV/Value.php
@@ -24,6 +24,6 @@ class Value
 
     public function __toString(): string
     {
-        return sprintf('%s: %s', $this->attribute, $this->name);
+        return sprintf('%s: %s', (string) $this->attribute, $this->name);
     }
 }
diff --git a/More/ServiceLocator/ServiceLocator.php b/More/ServiceLocator/ServiceLocator.php
index 6c7bdf0..3dfb542 100644
--- a/More/ServiceLocator/ServiceLocator.php
+++ b/More/ServiceLocator/ServiceLocator.php
@@ -5,18 +5,17 @@ namespace DesignPatterns\More\ServiceLocator;
 class ServiceLocator
 {
     /**
-     * @var array|Service[]
+     * @var string[][]
      */
     private $services = [];
 
     /**
-     * @var array|Service[]
+     * @var Service[]
      */
     private $instantiated = [];
 
     public function addInstance(string $class, Service $service)
     {
-        $this->services[$class] = $service;
         $this->instantiated[$class] = $service;
     }
 
@@ -55,6 +54,10 @@ class ServiceLocator
                 throw new \OutOfRangeException('Too many arguments given');
         }
 
+        if (!$object instanceof Service) {
+            throw new \InvalidArgumentException('Could not register service: is no instance of Service');
+        }
+
         $this->instantiated[$class] = $object;
 
         return $object;
diff --git a/Structural/Facade/Tests/FacadeTest.php b/Structural/Facade/Tests/FacadeTest.php
index 568c27d..452ca66 100644
--- a/Structural/Facade/Tests/FacadeTest.php
+++ b/Structural/Facade/Tests/FacadeTest.php
@@ -2,6 +2,7 @@
 
 namespace DesignPatterns\Structural\Facade\Tests;
 
+use DesignPatterns\Structural\Facade\Bios;
 use DesignPatterns\Structural\Facade\Facade;
 use DesignPatterns\Structural\Facade\OperatingSystem;
 use PHPUnit\Framework\TestCase;
@@ -10,27 +11,20 @@ class FacadeTest extends TestCase
 {
     public function testComputerOn()
     {
-        /** @var OperatingSystem|\PHPUnit_Framework_MockObject_MockObject $os */
-        $os = $this->createMock('DesignPatterns\Structural\Facade\OperatingSystem');
+        $os = $this->createMock(OperatingSystem::class);
 
         $os->method('getName')
             ->will($this->returnValue('Linux'));
 
-        $bios = $this->getMockBuilder('DesignPatterns\Structural\Facade\Bios')
-            ->setMethods(['launch', 'execute', 'waitForKeyPress'])
-            ->disableAutoload()
-            ->getMock();
+        $bios = $this->createMock(Bios::class);
 
-        $bios->expects($this->once())
-            ->method('launch')
+        $bios->method('launch')
             ->with($os);
 
+        /** @noinspection PhpParamsInspection */
         $facade = new Facade($bios, $os);
-
-        // the facade interface is simple
         $facade->turnOn();
 
-        // but you can also access the underlying components
         $this->assertSame('Linux', $os->getName());
     }
 }
diff --git a/Structural/Proxy/HeavyBankAccount.php b/Structural/Proxy/HeavyBankAccount.php
index 37aa0ca..432ce0d 100644
--- a/Structural/Proxy/HeavyBankAccount.php
+++ b/Structural/Proxy/HeavyBankAccount.php
@@ -20,6 +20,6 @@ class HeavyBankAccount implements BankAccount
         // years and decades ago must be fetched from a database or web service
         // and the balance must be calculated from it
 
-        return array_sum($this->transactions);
+        return (int) array_sum($this->transactions);
     }
 }
diff --git a/Structural/Registry/Tests/RegistryTest.php b/Structural/Registry/Tests/RegistryTest.php
index 3e02909..11a3ba1 100644
--- a/Structural/Registry/Tests/RegistryTest.php
+++ b/Structural/Registry/Tests/RegistryTest.php
@@ -9,9 +9,6 @@ use PHPUnit\Framework\TestCase;
 
 class RegistryTest extends TestCase
 {
-    /**
-     * @var Service|MockObject
-     */
     private $service;
 
     protected function setUp(): void
@@ -21,6 +18,7 @@ class RegistryTest extends TestCase
 
     public function testSetAndGetLogger()
     {
+        /** @noinspection PhpParamsInspection */
         Registry::set(Registry::LOGGER, $this->service);
 
         $this->assertSame($this->service, Registry::get(Registry::LOGGER));
diff --git a/composer.json b/composer.json
index e71c87c..ce8912d 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,9 @@
     "require-dev": {
         "phpunit/phpunit": "^8",
         "squizlabs/php_codesniffer": "^3",
-        "flyeralarm/php-code-validator": "^2.2"
+        "flyeralarm/php-code-validator": "^2.2",
+        "vimeo/psalm": "^3.4",
+        "psalm/plugin-phpunit": "^0.7.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
index 95ad521..14d11d8 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": "ef568154a3e2f0f81df2f2c9f1948e80",
+    "content-hash": "370ddff8d6fbcca75679dfa3d207c3cd",
     "packages": [
         {
             "name": "psr/http-message",
@@ -58,6 +58,248 @@
         }
     ],
     "packages-dev": [
+        {
+            "name": "amphp/amp",
+            "version": "v2.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/amp.git",
+                "reference": "c6a775a6c9fdd9ca4c909647a19b02d2d11a0568"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/amp/zipball/c6a775a6c9fdd9ca4c909647a19b02d2d11a0568",
+                "reference": "c6a775a6c9fdd9ca4c909647a19b02d2d11a0568",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1",
+                "ext-json": "*",
+                "phpstan/phpstan": "^0.8.5",
+                "phpunit/phpunit": "^6.0.9",
+                "react/promise": "^2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Amp\\": "lib"
+                },
+                "files": [
+                    "lib/functions.php",
+                    "lib/Internal/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Daniel Lowrey",
+                    "email": "rdlowrey@php.net"
+                },
+                {
+                    "name": "Aaron Piotrowski",
+                    "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Bob Weinand",
+                    "email": "bobwei9@hotmail.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
+                }
+            ],
+            "description": "A non-blocking concurrency framework for PHP applications.",
+            "homepage": "http://amphp.org/amp",
+            "keywords": [
+                "async",
+                "asynchronous",
+                "awaitable",
+                "concurrency",
+                "event",
+                "event-loop",
+                "future",
+                "non-blocking",
+                "promise"
+            ],
+            "time": "2019-08-02T20:37:42+00:00"
+        },
+        {
+            "name": "amphp/byte-stream",
+            "version": "v1.6.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/byte-stream.git",
+                "reference": "47908f8e8bb2da8af4e59028200758477bc927ea"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/47908f8e8bb2da8af4e59028200758477bc927ea",
+                "reference": "47908f8e8bb2da8af4e59028200758477bc927ea",
+                "shasum": ""
+            },
+            "require": {
+                "amphp/amp": "^2"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1",
+                "friendsofphp/php-cs-fixer": "^2.3",
+                "infection/infection": "^0.9.3",
+                "phpunit/phpunit": "^6"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Amp\\ByteStream\\": "lib"
+                },
+                "files": [
+                    "lib/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Aaron Piotrowski",
+                    "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
+                }
+            ],
+            "description": "A stream abstraction to make working with non-blocking I/O simple.",
+            "homepage": "http://amphp.org/byte-stream",
+            "keywords": [
+                "amp",
+                "amphp",
+                "async",
+                "io",
+                "non-blocking",
+                "stream"
+            ],
+            "time": "2019-07-26T21:22:49+00:00"
+        },
+        {
+            "name": "composer/semver",
+            "version": "1.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/semver.git",
+                "reference": "46d9139568ccb8d9e7cdd4539cab7347568a5e2e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/semver/zipball/46d9139568ccb8d9e7cdd4539cab7347568a5e2e",
+                "reference": "46d9139568ccb8d9e7cdd4539cab7347568a5e2e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.5 || ^5.0.5",
+                "phpunit/phpunit-mock-objects": "2.3.0 || ^3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Semver\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nils Adermann",
+                    "email": "naderman@naderman.de",
+                    "homepage": "http://www.naderman.de"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                },
+                {
+                    "name": "Rob Bast",
+                    "email": "rob.bast@gmail.com",
+                    "homepage": "http://robbast.nl"
+                }
+            ],
+            "description": "Semver library that offers utilities, version constraint parsing and validation.",
+            "keywords": [
+                "semantic",
+                "semver",
+                "validation",
+                "versioning"
+            ],
+            "time": "2019-03-19T17:25:45+00:00"
+        },
+        {
+            "name": "composer/xdebug-handler",
+            "version": "1.3.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/xdebug-handler.git",
+                "reference": "46867cbf8ca9fb8d60c506895449eb799db1184f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/46867cbf8ca9fb8d60c506895449eb799db1184f",
+                "reference": "46867cbf8ca9fb8d60c506895449eb799db1184f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0",
+                "psr/log": "^1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Composer\\XdebugHandler\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Stevenson",
+                    "email": "john-stevenson@blueyonder.co.uk"
+                }
+            ],
+            "description": "Restarts a process without xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
+            ],
+            "time": "2019-05-27T17:52:04+00:00"
+        },
         {
             "name": "doctrine/instantiator",
             "version": "1.2.0",
@@ -114,6 +356,94 @@
             ],
             "time": "2019-03-17T17:37:11+00:00"
         },
+        {
+            "name": "felixfbecker/advanced-json-rpc",
+            "version": "v3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-advanced-json-rpc.git",
+                "reference": "241c470695366e7b83672be04ea0e64d8085a551"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-advanced-json-rpc/zipball/241c470695366e7b83672be04ea0e64d8085a551",
+                "reference": "241c470695366e7b83672be04ea0e64d8085a551",
+                "shasum": ""
+            },
+            "require": {
+                "netresearch/jsonmapper": "^1.0",
+                "php": ">=7.0",
+                "phpdocumentor/reflection-docblock": "^4.0.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "AdvancedJsonRpc\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "ISC"
+            ],
+            "authors": [
+                {
+                    "name": "Felix Becker",
+                    "email": "felix.b@outlook.com"
+                }
+            ],
+            "description": "A more advanced JSONRPC implementation",
+            "time": "2018-09-10T08:58:41+00:00"
+        },
+        {
+            "name": "felixfbecker/language-server-protocol",
+            "version": "v1.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-language-server-protocol.git",
+                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/378801f6139bb74ac215d81cca1272af61df9a9f",
+                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "*",
+                "phpunit/phpunit": "^6.3",
+                "squizlabs/php_codesniffer": "^3.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "LanguageServerProtocol\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "ISC"
+            ],
+            "authors": [
+                {
+                    "name": "Felix Becker",
+                    "email": "felix.b@outlook.com"
+                }
+            ],
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@@ -1576,6 +2330,181 @@
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+                "ocramius/package-versions": "^1.2",
+                "openlss/lib-array2xml": "^1.0",
+                "php": "^7.1",
+                "sebastian/diff": "^3.0",
+                "symfony/console": "^3.3||^4.0",
+                "webmozart/glob": "^4.1",
+                "webmozart/path-util": "^2.3"
+            },
+            "provide": {
+                "psalm/psalm": "self.version"
+            },
+            "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.2",
+                "friendsofphp/php-cs-fixer": "^2.15",
+                "phpmyadmin/sql-parser": "^5.0",
+                "phpunit/phpunit": "^7.5 || ^8.0",
+                "psalm/plugin-phpunit": "^0.6",
+                "slevomat/coding-standard": "^5.0",
+                "squizlabs/php_codesniffer": "3.4.0",
+                "symfony/process": "^4.3"
+            },
+            "suggest": {
+                "ext-igbinary": "^2.0.5"
+            },
+            "bin": [
+                "psalm",
+                "psalter",
+                "psalm-language-server",
+                "psalm-plugin",
+                "psalm-refactor"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.x-dev",
+                    "dev-2.x": "2.x-dev",
+                    "dev-1.x": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psalm\\Plugin\\": "src/Psalm/Plugin",
+                    "Psalm\\": "src/Psalm"
+                },
+                "files": [
+                    "src/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Matthew Brown"
+                }
+            ],
+            "description": "A static analysis tool for finding errors in PHP applications",
+            "keywords": [
+                "code",
+                "inspection",
+                "php"
+            ],
+            "time": "2019-08-20T18:26:32+00:00"
+        },
         {
             "name": "webmozart/assert",
             "version": "1.5.0",
@@ -1665,6 +2681,99 @@
                 "validate"
             ],
             "time": "2019-08-24T08:43:50+00:00"
+        },
+        {
+            "name": "webmozart/glob",
+            "version": "4.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/glob.git",
+                "reference": "3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/glob/zipball/3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe",
+                "reference": "3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3|^7.0",
+                "webmozart/path-util": "^2.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1",
+                "symfony/filesystem": "^2.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Glob\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "A PHP implementation of Ant's glob.",
+            "time": "2015-12-29T11:14:33+00:00"
+        },
+        {
+            "name": "webmozart/path-util",
+            "version": "2.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/path-util.git",
+                "reference": "d939f7edc24c9a1bb9c0dee5cb05d8e859490725"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/path-util/zipball/d939f7edc24c9a1bb9c0dee5cb05d8e859490725",
+                "reference": "d939f7edc24c9a1bb9c0dee5cb05d8e859490725",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3",
+                "webmozart/assert": "~1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\PathUtil\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "A robust cross-platform utility for normalizing, comparing and modifying file paths.",
+            "time": "2015-12-17T08:42:14+00:00"
         }
     ],
     "aliases": [],
diff --git a/psalm.xml b/psalm.xml
new file mode 100644
index 0000000..1061909
--- /dev/null
+++ b/psalm.xml
@@ -0,0 +1,60 @@
+<?xml version="1.0"?>
+<psalm
+    totallyTyped="false"
+    resolveFromConfigFile="true"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="https://getpsalm.org/schema/config"
+    xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+>
+    <projectFiles>
+        <directory name="Behavioral"/>
+        <directory name="Creational"/>
+        <directory name="More"/>
+        <directory name="Structural"/>
+        <ignoreFiles>
+            <directory name="vendor"/>
+        </ignoreFiles>
+    </projectFiles>
+
+    <issueHandlers>
+        <LessSpecificReturnType errorLevel="info"/>
+
+        <!-- level 3 issues - slightly lazy code writing, but provably low false-negatives -->
+
+        <DeprecatedMethod errorLevel="info"/>
+        <DeprecatedProperty errorLevel="info"/>
+        <DeprecatedClass errorLevel="info"/>
+        <DeprecatedConstant errorLevel="info"/>
+        <DeprecatedFunction errorLevel="info"/>
+        <DeprecatedInterface errorLevel="info"/>
+        <DeprecatedTrait errorLevel="info"/>
+
+        <InternalMethod errorLevel="info"/>
+        <InternalProperty errorLevel="info"/>
+        <InternalClass errorLevel="info"/>
+
+        <MissingClosureReturnType errorLevel="info"/>
+        <MissingReturnType errorLevel="info"/>
+        <MissingPropertyType errorLevel="info"/>
+        <InvalidDocblock errorLevel="info"/>
+        <MisplacedRequiredParam errorLevel="info"/>
+
+        <PropertyNotSetInConstructor errorLevel="info"/>
+        <MissingConstructor errorLevel="info"/>
+        <MissingClosureParamType errorLevel="info"/>
+        <MissingParamType errorLevel="info"/>
+
+        <RedundantCondition errorLevel="info"/>
+
+        <DocblockTypeContradiction errorLevel="info"/>
+        <RedundantConditionGivenDocblockType errorLevel="info"/>
+
+        <UnresolvableInclude errorLevel="info"/>
+
+        <RawObjectIteration errorLevel="info"/>
+
+        <InvalidStringClass errorLevel="info"/>
+    </issueHandlers>
+<plugins>
+    <pluginClass class="Psalm\PhpUnitPlugin\Plugin"/></plugins>
+</psalm>