From b5c8c9ee12c8b47346a847c7277f355c1f3ff33a Mon Sep 17 00:00:00 2001
From: Danny van der Sluijs <danny.vandersluijs@icloud.com>
Date: Thu, 21 Nov 2024 22:10:43 +0100
Subject: [PATCH] refactor: add declare strict_types to all classes in ./src
 (#758)

* refactor: add declare strict_types to all classes in ./src

* fix: correct regression from adding declare strict_types

* refactor: enforce string at datetime casting

* docs: add changelog entry
---
 CHANGELOG.md                                                  | 1 +
 src/JsonSchema/ConstraintError.php                            | 2 ++
 src/JsonSchema/Constraints/BaseConstraint.php                 | 2 ++
 src/JsonSchema/Constraints/CollectionConstraint.php           | 2 ++
 src/JsonSchema/Constraints/ConstConstraint.php                | 2 ++
 src/JsonSchema/Constraints/Constraint.php                     | 2 ++
 src/JsonSchema/Constraints/ConstraintInterface.php            | 2 ++
 src/JsonSchema/Constraints/EnumConstraint.php                 | 2 ++
 src/JsonSchema/Constraints/Factory.php                        | 2 ++
 src/JsonSchema/Constraints/FormatConstraint.php               | 4 +++-
 src/JsonSchema/Constraints/NumberConstraint.php               | 2 ++
 src/JsonSchema/Constraints/ObjectConstraint.php               | 2 ++
 src/JsonSchema/Constraints/SchemaConstraint.php               | 2 ++
 src/JsonSchema/Constraints/StringConstraint.php               | 2 ++
 src/JsonSchema/Constraints/TypeCheck/LooseTypeCheck.php       | 2 ++
 src/JsonSchema/Constraints/TypeCheck/StrictTypeCheck.php      | 2 ++
 src/JsonSchema/Constraints/TypeCheck/TypeCheckInterface.php   | 2 ++
 src/JsonSchema/Constraints/TypeConstraint.php                 | 2 ++
 src/JsonSchema/Constraints/UndefinedConstraint.php            | 2 ++
 src/JsonSchema/Entity/JsonPointer.php                         | 4 +++-
 src/JsonSchema/Enum.php                                       | 2 ++
 src/JsonSchema/Exception/ExceptionInterface.php               | 2 ++
 src/JsonSchema/Exception/InvalidArgumentException.php         | 2 ++
 src/JsonSchema/Exception/InvalidConfigException.php           | 2 ++
 src/JsonSchema/Exception/InvalidSchemaException.php           | 2 ++
 src/JsonSchema/Exception/InvalidSchemaMediaTypeException.php  | 2 ++
 src/JsonSchema/Exception/InvalidSourceUriException.php        | 2 ++
 src/JsonSchema/Exception/JsonDecodingException.php            | 2 ++
 src/JsonSchema/Exception/ResourceNotFoundException.php        | 2 ++
 src/JsonSchema/Exception/RuntimeException.php                 | 2 ++
 src/JsonSchema/Exception/UnresolvableJsonPointerException.php | 2 ++
 src/JsonSchema/Exception/UriResolverException.php             | 2 ++
 src/JsonSchema/Exception/ValidationException.php              | 2 ++
 src/JsonSchema/Iterator/ObjectIterator.php                    | 2 ++
 src/JsonSchema/Rfc3339.php                                    | 2 ++
 src/JsonSchema/SchemaStorage.php                              | 2 ++
 src/JsonSchema/SchemaStorageInterface.php                     | 2 ++
 src/JsonSchema/Uri/Retrievers/AbstractRetriever.php           | 3 +++
 src/JsonSchema/Uri/Retrievers/Curl.php                        | 2 ++
 src/JsonSchema/Uri/Retrievers/FileGetContents.php             | 2 ++
 src/JsonSchema/Uri/Retrievers/PredefinedArray.php             | 2 ++
 src/JsonSchema/Uri/Retrievers/UriRetrieverInterface.php       | 2 ++
 src/JsonSchema/Uri/UriResolver.php                            | 2 ++
 src/JsonSchema/Uri/UriRetriever.php                           | 2 ++
 src/JsonSchema/UriResolverInterface.php                       | 2 ++
 src/JsonSchema/UriRetrieverInterface.php                      | 2 ++
 src/JsonSchema/Validator.php                                  | 2 ++
 47 files changed, 96 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 99726be8..7f7db619 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add ext-json to composer.json to ensure JSON extension available  ([#759](https://github.com/jsonrainbow/json-schema/pull/759))
 - Add visibility modifiers to class constants ([#757](https://github.com/jsonrainbow/json-schema/pull/757))
 - Include PHP 8.4 in workflow ([#765](https://github.com/jsonrainbow/json-schema/pull/765))
+- Add `strict_types=1` to all classes in ./src ([#758](https://github.com/jsonrainbow/json-schema/pull/758))
 
 ## [6.0.0] - 2024-07-30
 ### Added
diff --git a/src/JsonSchema/ConstraintError.php b/src/JsonSchema/ConstraintError.php
index ac7358a1..8b1c1450 100644
--- a/src/JsonSchema/ConstraintError.php
+++ b/src/JsonSchema/ConstraintError.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema;
 
 use JsonSchema\Exception\InvalidArgumentException;
diff --git a/src/JsonSchema/Constraints/BaseConstraint.php b/src/JsonSchema/Constraints/BaseConstraint.php
index 66be2dcd..a4b4c9a2 100644
--- a/src/JsonSchema/Constraints/BaseConstraint.php
+++ b/src/JsonSchema/Constraints/BaseConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/CollectionConstraint.php b/src/JsonSchema/Constraints/CollectionConstraint.php
index d563fd77..297bc24c 100644
--- a/src/JsonSchema/Constraints/CollectionConstraint.php
+++ b/src/JsonSchema/Constraints/CollectionConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/ConstConstraint.php b/src/JsonSchema/Constraints/ConstConstraint.php
index 18076048..9d5a1cfb 100644
--- a/src/JsonSchema/Constraints/ConstConstraint.php
+++ b/src/JsonSchema/Constraints/ConstConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/Constraint.php b/src/JsonSchema/Constraints/Constraint.php
index 62da7a85..2a45f0da 100644
--- a/src/JsonSchema/Constraints/Constraint.php
+++ b/src/JsonSchema/Constraints/Constraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/ConstraintInterface.php b/src/JsonSchema/Constraints/ConstraintInterface.php
index 2c2e23d9..28d5ac5a 100644
--- a/src/JsonSchema/Constraints/ConstraintInterface.php
+++ b/src/JsonSchema/Constraints/ConstraintInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/EnumConstraint.php b/src/JsonSchema/Constraints/EnumConstraint.php
index 22686673..2bf4e88e 100644
--- a/src/JsonSchema/Constraints/EnumConstraint.php
+++ b/src/JsonSchema/Constraints/EnumConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/Factory.php b/src/JsonSchema/Constraints/Factory.php
index 92f01ad5..7861fc83 100644
--- a/src/JsonSchema/Constraints/Factory.php
+++ b/src/JsonSchema/Constraints/Factory.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/FormatConstraint.php b/src/JsonSchema/Constraints/FormatConstraint.php
index 355c6c0c..482ba668 100644
--- a/src/JsonSchema/Constraints/FormatConstraint.php
+++ b/src/JsonSchema/Constraints/FormatConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
@@ -174,7 +176,7 @@ public function check(&$element, $schema = null, ?JsonPointer $path = null, $i =
 
     protected function validateDateTime($datetime, $format)
     {
-        $dt = \DateTime::createFromFormat($format, $datetime);
+        $dt = \DateTime::createFromFormat($format, (string) $datetime);
 
         if (!$dt) {
             return false;
diff --git a/src/JsonSchema/Constraints/NumberConstraint.php b/src/JsonSchema/Constraints/NumberConstraint.php
index 90c3eb04..2a3e7dee 100644
--- a/src/JsonSchema/Constraints/NumberConstraint.php
+++ b/src/JsonSchema/Constraints/NumberConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/ObjectConstraint.php b/src/JsonSchema/Constraints/ObjectConstraint.php
index 5b7d1d00..ec25ff06 100644
--- a/src/JsonSchema/Constraints/ObjectConstraint.php
+++ b/src/JsonSchema/Constraints/ObjectConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/SchemaConstraint.php b/src/JsonSchema/Constraints/SchemaConstraint.php
index 220a2dea..5712e9d6 100644
--- a/src/JsonSchema/Constraints/SchemaConstraint.php
+++ b/src/JsonSchema/Constraints/SchemaConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/StringConstraint.php b/src/JsonSchema/Constraints/StringConstraint.php
index ded7e570..ca53c2b1 100644
--- a/src/JsonSchema/Constraints/StringConstraint.php
+++ b/src/JsonSchema/Constraints/StringConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/TypeCheck/LooseTypeCheck.php b/src/JsonSchema/Constraints/TypeCheck/LooseTypeCheck.php
index 98428853..18057512 100644
--- a/src/JsonSchema/Constraints/TypeCheck/LooseTypeCheck.php
+++ b/src/JsonSchema/Constraints/TypeCheck/LooseTypeCheck.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema\Constraints\TypeCheck;
 
 class LooseTypeCheck implements TypeCheckInterface
diff --git a/src/JsonSchema/Constraints/TypeCheck/StrictTypeCheck.php b/src/JsonSchema/Constraints/TypeCheck/StrictTypeCheck.php
index 59fa12be..b0aa813a 100644
--- a/src/JsonSchema/Constraints/TypeCheck/StrictTypeCheck.php
+++ b/src/JsonSchema/Constraints/TypeCheck/StrictTypeCheck.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema\Constraints\TypeCheck;
 
 class StrictTypeCheck implements TypeCheckInterface
diff --git a/src/JsonSchema/Constraints/TypeCheck/TypeCheckInterface.php b/src/JsonSchema/Constraints/TypeCheck/TypeCheckInterface.php
index 10b40ea0..0333b0aa 100644
--- a/src/JsonSchema/Constraints/TypeCheck/TypeCheckInterface.php
+++ b/src/JsonSchema/Constraints/TypeCheck/TypeCheckInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema\Constraints\TypeCheck;
 
 interface TypeCheckInterface
diff --git a/src/JsonSchema/Constraints/TypeConstraint.php b/src/JsonSchema/Constraints/TypeConstraint.php
index b898277a..3e9735f1 100644
--- a/src/JsonSchema/Constraints/TypeConstraint.php
+++ b/src/JsonSchema/Constraints/TypeConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Constraints/UndefinedConstraint.php b/src/JsonSchema/Constraints/UndefinedConstraint.php
index aa28c191..05cc89a1 100644
--- a/src/JsonSchema/Constraints/UndefinedConstraint.php
+++ b/src/JsonSchema/Constraints/UndefinedConstraint.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Entity/JsonPointer.php b/src/JsonSchema/Entity/JsonPointer.php
index 7f7f5a57..ee4a1d35 100644
--- a/src/JsonSchema/Entity/JsonPointer.php
+++ b/src/JsonSchema/Entity/JsonPointer.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
@@ -120,7 +122,7 @@ public function getPropertyPaths()
     public function withPropertyPaths(array $propertyPaths)
     {
         $new = clone $this;
-        $new->propertyPaths = $propertyPaths;
+        $new->propertyPaths = array_map(function ($p): string { return (string) $p; }, $propertyPaths);
 
         return $new;
     }
diff --git a/src/JsonSchema/Enum.php b/src/JsonSchema/Enum.php
index c52f8daa..ef8cb285 100644
--- a/src/JsonSchema/Enum.php
+++ b/src/JsonSchema/Enum.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema;
 
 abstract class Enum extends \MabeEnum\Enum
diff --git a/src/JsonSchema/Exception/ExceptionInterface.php b/src/JsonSchema/Exception/ExceptionInterface.php
index 439bd277..c72d4197 100644
--- a/src/JsonSchema/Exception/ExceptionInterface.php
+++ b/src/JsonSchema/Exception/ExceptionInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema\Exception;
 
 interface ExceptionInterface
diff --git a/src/JsonSchema/Exception/InvalidArgumentException.php b/src/JsonSchema/Exception/InvalidArgumentException.php
index cabfa680..ae163e08 100644
--- a/src/JsonSchema/Exception/InvalidArgumentException.php
+++ b/src/JsonSchema/Exception/InvalidArgumentException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/InvalidConfigException.php b/src/JsonSchema/Exception/InvalidConfigException.php
index a48d6da0..8f2d18f4 100644
--- a/src/JsonSchema/Exception/InvalidConfigException.php
+++ b/src/JsonSchema/Exception/InvalidConfigException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/InvalidSchemaException.php b/src/JsonSchema/Exception/InvalidSchemaException.php
index c1209958..a51f9f53 100644
--- a/src/JsonSchema/Exception/InvalidSchemaException.php
+++ b/src/JsonSchema/Exception/InvalidSchemaException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/InvalidSchemaMediaTypeException.php b/src/JsonSchema/Exception/InvalidSchemaMediaTypeException.php
index bcac26f4..d7abb111 100644
--- a/src/JsonSchema/Exception/InvalidSchemaMediaTypeException.php
+++ b/src/JsonSchema/Exception/InvalidSchemaMediaTypeException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/InvalidSourceUriException.php b/src/JsonSchema/Exception/InvalidSourceUriException.php
index 37db1216..86c12c97 100644
--- a/src/JsonSchema/Exception/InvalidSourceUriException.php
+++ b/src/JsonSchema/Exception/InvalidSourceUriException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/JsonDecodingException.php b/src/JsonSchema/Exception/JsonDecodingException.php
index 7641f61b..5a4170b8 100644
--- a/src/JsonSchema/Exception/JsonDecodingException.php
+++ b/src/JsonSchema/Exception/JsonDecodingException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/ResourceNotFoundException.php b/src/JsonSchema/Exception/ResourceNotFoundException.php
index e639ba32..9417c2ac 100644
--- a/src/JsonSchema/Exception/ResourceNotFoundException.php
+++ b/src/JsonSchema/Exception/ResourceNotFoundException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/RuntimeException.php b/src/JsonSchema/Exception/RuntimeException.php
index 8a2a9006..7d04c314 100644
--- a/src/JsonSchema/Exception/RuntimeException.php
+++ b/src/JsonSchema/Exception/RuntimeException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/UnresolvableJsonPointerException.php b/src/JsonSchema/Exception/UnresolvableJsonPointerException.php
index 5f49e2f0..0fe92950 100644
--- a/src/JsonSchema/Exception/UnresolvableJsonPointerException.php
+++ b/src/JsonSchema/Exception/UnresolvableJsonPointerException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/UriResolverException.php b/src/JsonSchema/Exception/UriResolverException.php
index 13b73033..9170a3fc 100644
--- a/src/JsonSchema/Exception/UriResolverException.php
+++ b/src/JsonSchema/Exception/UriResolverException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Exception/ValidationException.php b/src/JsonSchema/Exception/ValidationException.php
index 65d8849e..a21612a1 100644
--- a/src/JsonSchema/Exception/ValidationException.php
+++ b/src/JsonSchema/Exception/ValidationException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Iterator/ObjectIterator.php b/src/JsonSchema/Iterator/ObjectIterator.php
index 97edf43b..9eb121cb 100644
--- a/src/JsonSchema/Iterator/ObjectIterator.php
+++ b/src/JsonSchema/Iterator/ObjectIterator.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Rfc3339.php b/src/JsonSchema/Rfc3339.php
index e3226ec7..3524f681 100644
--- a/src/JsonSchema/Rfc3339.php
+++ b/src/JsonSchema/Rfc3339.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema;
 
 class Rfc3339
diff --git a/src/JsonSchema/SchemaStorage.php b/src/JsonSchema/SchemaStorage.php
index 81691699..34f0daae 100644
--- a/src/JsonSchema/SchemaStorage.php
+++ b/src/JsonSchema/SchemaStorage.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema;
 
 use JsonSchema\Constraints\BaseConstraint;
diff --git a/src/JsonSchema/SchemaStorageInterface.php b/src/JsonSchema/SchemaStorageInterface.php
index ddaf6633..eca44283 100644
--- a/src/JsonSchema/SchemaStorageInterface.php
+++ b/src/JsonSchema/SchemaStorageInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema;
 
 interface SchemaStorageInterface
diff --git a/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php b/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php
index 9ab24b95..f4ae718a 100644
--- a/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php
+++ b/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * JsonSchema
  *
diff --git a/src/JsonSchema/Uri/Retrievers/Curl.php b/src/JsonSchema/Uri/Retrievers/Curl.php
index 844ca1e4..116607ae 100644
--- a/src/JsonSchema/Uri/Retrievers/Curl.php
+++ b/src/JsonSchema/Uri/Retrievers/Curl.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Uri/Retrievers/FileGetContents.php b/src/JsonSchema/Uri/Retrievers/FileGetContents.php
index 34e6ede0..18fb7fcf 100644
--- a/src/JsonSchema/Uri/Retrievers/FileGetContents.php
+++ b/src/JsonSchema/Uri/Retrievers/FileGetContents.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Uri/Retrievers/PredefinedArray.php b/src/JsonSchema/Uri/Retrievers/PredefinedArray.php
index a663d341..11693002 100644
--- a/src/JsonSchema/Uri/Retrievers/PredefinedArray.php
+++ b/src/JsonSchema/Uri/Retrievers/PredefinedArray.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace JsonSchema\Uri\Retrievers;
 
 use JsonSchema\Validator;
diff --git a/src/JsonSchema/Uri/Retrievers/UriRetrieverInterface.php b/src/JsonSchema/Uri/Retrievers/UriRetrieverInterface.php
index 2cc40cf2..99a2d9e7 100644
--- a/src/JsonSchema/Uri/Retrievers/UriRetrieverInterface.php
+++ b/src/JsonSchema/Uri/Retrievers/UriRetrieverInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Uri/UriResolver.php b/src/JsonSchema/Uri/UriResolver.php
index b62cbafa..00a47e81 100644
--- a/src/JsonSchema/Uri/UriResolver.php
+++ b/src/JsonSchema/Uri/UriResolver.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Uri/UriRetriever.php b/src/JsonSchema/Uri/UriRetriever.php
index 793e0ea3..4094cccc 100644
--- a/src/JsonSchema/Uri/UriRetriever.php
+++ b/src/JsonSchema/Uri/UriRetriever.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/UriResolverInterface.php b/src/JsonSchema/UriResolverInterface.php
index 4eb50c03..e80e2be7 100644
--- a/src/JsonSchema/UriResolverInterface.php
+++ b/src/JsonSchema/UriResolverInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/UriRetrieverInterface.php b/src/JsonSchema/UriRetrieverInterface.php
index 94ad0cba..6f503221 100644
--- a/src/JsonSchema/UriRetrieverInterface.php
+++ b/src/JsonSchema/UriRetrieverInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *
diff --git a/src/JsonSchema/Validator.php b/src/JsonSchema/Validator.php
index 97365d43..86440949 100644
--- a/src/JsonSchema/Validator.php
+++ b/src/JsonSchema/Validator.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the JsonSchema package.
  *