Install and configure PHPStan

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
             fail-fast: false
             matrix:
                 php: [8.0, 8.1, 8.2]
-                dependency-version: [prefer-stable]
+                dependency-version: [prefer-lowest, prefer-stable]
                 os: [ubuntu-latest, windows-latest]
 
         name: PHP ${{ matrix.php }} - ${{ matrix.dependency-version }} - ${{ matrix.os }}
@@ -81,3 +81,22 @@ jobs:
 
             - name: Execute check
               run: phpcs --standard=psr12 src/
+
+    static:
+        runs-on: ubuntu-latest
+
+        name: Coding style
+
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 8.0
+                  tools: phpstan
+                  coverage: none
+
+            - name: Execute check
+              run: phpstan analyse

README.md

@@ -5,6 +5,7 @@
 [![Build Status][ico-actions]][link-actions]
 [![Coverage Status][ico-scrutinizer]][link-scrutinizer]
 [![Quality Score][ico-code-quality]][link-code-quality]
+[![PHPStan Level][ico-phpstan]][link-phpstan]
 [![Latest Version][ico-version]][link-packagist]
 [![Software License][ico-license]](LICENSE.md)
 [![PSR-12][ico-psr12]][link-psr12]
@@ -60,6 +61,7 @@ The MIT License (MIT). Please see [License File](LICENSE.md) for more informatio
 [ico-psr12]: https://img.shields.io/static/v1?label=compliance&message=PSR-12&color=blue&style=flat-square
 [ico-scrutinizer]: https://img.shields.io/scrutinizer/coverage/g/cerbero90/json-parser.svg?style=flat-square&logo=scrutinizer
 [ico-code-quality]: https://img.shields.io/scrutinizer/g/cerbero90/json-parser.svg?style=flat-square&logo=scrutinizer
+[ico-phpstan]: https://img.shields.io/badge/level-max-success?style=flat-square&logo=data:image/png;base64,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
 [ico-downloads]: https://img.shields.io/packagist/dt/cerbero/json-parser.svg?style=flat-square
 
 [link-author]: https://twitter.com/cerbero90
@@ -69,5 +71,6 @@ The MIT License (MIT). Please see [License File](LICENSE.md) for more informatio
 [link-psr12]: https://www.php-fig.org/psr/psr-12/
 [link-scrutinizer]: https://scrutinizer-ci.com/g/cerbero90/json-parser/code-structure
 [link-code-quality]: https://scrutinizer-ci.com/g/cerbero90/json-parser
+[link-phpstan]: https://phpstan.org/
 [link-downloads]: https://packagist.org/packages/cerbero/json-parser
 [link-contributors]: ../../contributors

composer.json

@@ -24,6 +24,7 @@
         "guzzlehttp/guzzle": "^7.2",
         "illuminate/http": ">=6.20",
         "pestphp/pest": "^1.21",
+        "phpstan/phpstan": "^1.9",
         "scrutinizer/ocular": "^1.8",
         "squizlabs/php_codesniffer": "^3.0"
     },

phpstan-baseline.neon

@@ -0,0 +1,16 @@
+parameters:
+	ignoreErrors:
+		-
+			message: "#^Generator expects key type int\\|string, mixed given\\.$#"
+			count: 1
+			path: src/Parser.php
+
+		-
+			message: "#^Parameter \\#1 \\$json of method Cerbero\\\\JsonParser\\\\Decoders\\\\ConfigurableDecoder\\:\\:decode\\(\\) expects string, int\\|string given\\.$#"
+			count: 1
+			path: src/Parser.php
+
+		-
+			message: "#^Binary operation \"\\+\" between int\\|string and 1 results in an error\\.$#"
+			count: 1
+			path: src/Tree.php

phpstan.neon

@@ -0,0 +1,6 @@
+parameters:
+    level: max
+    paths:
+        - src
+includes:
+    - phpstan-baseline.neon