Enable strict type checking

Author: fredden

Magento2/Helpers/Commenting/PHPDocFormattingValidator.php

@@ -4,6 +4,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Helpers\Commenting;
 
 use PHP_CodeSniffer\Files\File;

Magento2/Helpers/Tokenizer/AbstractTokenizer.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Helpers\Tokenizer;
 
 /**

Magento2/Helpers/Tokenizer/Parameter.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Helpers\Tokenizer;
 
 /**

Magento2/Helpers/Tokenizer/Variable.php

@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento2\Helpers\Tokenizer;
 

Magento2/Sniffs/Classes/AbstractApiSniff.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Sniffs\Classes;
 
 use PHP_CodeSniffer\Sniffs\Sniff;

Magento2/Sniffs/Classes/DiscouragedDependenciesSniff.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Sniffs\Classes;
 
 use PHP_CodeSniffer\Files\File;

Magento2/Sniffs/CodeAnalysis/EmptyBlockSniff.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Sniffs\CodeAnalysis;
 
 use PHP_CodeSniffer\Files\File;

Magento2/Sniffs/Commenting/ClassAndInterfacePHPDocFormattingSniff.php

@@ -4,6 +4,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Sniffs\Commenting;
 
 use Magento2\Helpers\Commenting\PHPDocFormattingValidator;

Magento2/Sniffs/Commenting/ConstantsPHPDocFormattingSniff.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Sniffs\Commenting;
 
 use Magento2\Helpers\Commenting\PHPDocFormattingValidator;

Magento2/Sniffs/Exceptions/DirectThrowSniff.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento2\Sniffs\Exceptions;
 
 use PHP_CodeSniffer\Sniffs\Sniff;