diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27cc5d8..57986ce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
           path: /tmp/composer-cache
           key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
 
-      - uses: php-actions/composer@v5
+      - uses: php-actions/composer@v6
 
       - name: Archive build
         run: mkdir /tmp/github-actions/ && tar -cvf /tmp/github-actions/build.tar ./
@@ -40,7 +40,7 @@ jobs:
         run: tar -xvf /tmp/github-actions/build.tar ./
 
       - name: PHP Unit tests
-        uses: php-actions/phpunit@v2
+        uses: php-actions/phpunit@v3
         with:
           php_version: 8.0
           php_extensions: xdebug
@@ -61,6 +61,6 @@ jobs:
         run: tar -xvf /tmp/github-actions/build.tar ./
 
       - name: PHP Static Analysis
-        uses: php-actions/phpstan@v2
+        uses: php-actions/phpstan@v3
         with:
-          path: src/
\ No newline at end of file
+          path: src/
diff --git a/composer.json b/composer.json
index 11c66c9..c9fc62f 100644
--- a/composer.json
+++ b/composer.json
@@ -3,13 +3,13 @@
 	"description": "Synchronise two directories.",
 
 	"require": {
-		"php": ">=7.2",
+		"php": ">=8.0",
 		"phpgt/cli": "1.3.*",
 		"webmozart/glob": "4.*"
 	},
 
 	"require-dev": {
-		"phpunit/phpunit": "9.*",
+		"phpunit/phpunit": "^9.5",
 		"phpstan/phpstan": "^0.12"
 	},
 
diff --git a/composer.lock b/composer.lock
index 6c3b580..76bbe11 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,29 +4,31 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "11d482008291e381ae0e701166c0da40",
+    "content-hash": "dec546656a55609976c28c9900772c68",
     "packages": [
         {
             "name": "phpgt/cli",
-            "version": "v1.3.0",
+            "version": "v1.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PhpGt/Cli.git",
-                "reference": "3432e0a31080bcc40e690e049d6396c9f96cac09"
+                "reference": "3f00088f76225088602e6d9faa1cf90fbd2205d3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PhpGt/Cli/zipball/3432e0a31080bcc40e690e049d6396c9f96cac09",
-                "reference": "3432e0a31080bcc40e690e049d6396c9f96cac09",
+                "url": "https://api.github.com/repos/PhpGt/Cli/zipball/3f00088f76225088602e6d9faa1cf90fbd2205d3",
+                "reference": "3f00088f76225088602e6d9faa1cf90fbd2205d3",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
-                "php": ">=7.4",
-                "phpgt/daemon": "*"
+                "ext-readline": "*",
+                "php": ">=8.0",
+                "phpgt/daemon": "1.*"
             },
             "require-dev": {
-                "phpunit/phpunit": "8.*"
+                "phpstan/phpstan": ">=0.12.64",
+                "phpunit/phpunit": "9.*"
             },
             "type": "library",
             "autoload": {
@@ -51,27 +53,38 @@
                 "terminal",
                 "webengine"
             ],
-            "time": "2020-01-03T15:42:11+00:00"
+            "support": {
+                "issues": "https://github.com/PhpGt/Cli/issues",
+                "source": "https://github.com/PhpGt/Cli/tree/v1.3.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sponsors/PhpGt",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-06-15T19:01:44+00:00"
         },
         {
             "name": "phpgt/daemon",
-            "version": "v1.1.1",
+            "version": "v1.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PhpGt/Daemon.git",
-                "reference": "03cc376ec1969530b4478f8278732eb3f97dd09e"
+                "reference": "6490df99a22818149f30e3af408002ea7f73e035"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PhpGt/Daemon/zipball/03cc376ec1969530b4478f8278732eb3f97dd09e",
-                "reference": "03cc376ec1969530b4478f8278732eb3f97dd09e",
+                "url": "https://api.github.com/repos/PhpGt/Daemon/zipball/6490df99a22818149f30e3af408002ea7f73e035",
+                "reference": "6490df99a22818149f30e3af408002ea7f73e035",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7.4"
             },
             "require-dev": {
-                "phpunit/phpunit": "8.*"
+                "phpstan/phpstan": ">=0.12.42",
+                "phpunit/phpunit": "9.*"
             },
             "type": "library",
             "autoload": {
@@ -81,20 +94,30 @@
             },
             "notification-url": "https://packagist.org/downloads/",
             "description": "Background script execution with cross-platform compatible streaming.",
-            "time": "2020-01-03T14:17:34+00:00"
+            "support": {
+                "issues": "https://github.com/PhpGt/Daemon/issues",
+                "source": "https://github.com/PhpGt/Daemon/tree/v1.1.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/phpgt",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-02-02T17:33:16+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.20.0",
+            "version": "v1.23.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
-                "reference": "f4ba089a5b6366e453971d3aad5fe8e897b37f41"
+                "reference": "46cd95797e9df938fdd2b03693b5fca5e64b01ce"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/f4ba089a5b6366e453971d3aad5fe8e897b37f41",
-                "reference": "f4ba089a5b6366e453971d3aad5fe8e897b37f41",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/46cd95797e9df938fdd2b03693b5fca5e64b01ce",
+                "reference": "46cd95797e9df938fdd2b03693b5fca5e64b01ce",
                 "shasum": ""
             },
             "require": {
@@ -106,7 +129,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "1.20-dev"
+                    "dev-main": "1.23-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -143,6 +166,9 @@
                 "polyfill",
                 "portable"
             ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.23.0"
+            },
             "funding": [
                 {
                     "url": "https://symfony.com/sponsor",
@@ -157,34 +183,39 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-23T14:02:19+00:00"
+            "time": "2021-02-19T12:13:01+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.9.1",
+            "version": "1.10.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
-                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/6964c76c7804814a842473e0c8fd15bab0f18e25",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0 || ^8.0",
+                "php": "^7.2 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
             "conflict": {
                 "phpstan/phpstan": "<0.12.20",
-                "vimeo/psalm": "<3.9.1"
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+                "phpunit/phpunit": "^8.5.13"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -206,35 +237,38 @@
                 "check",
                 "validate"
             ],
-            "time": "2020-07-08T17:02:28+00:00"
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.10.0"
+            },
+            "time": "2021-03-09T10:59:23+00:00"
         },
         {
             "name": "webmozart/glob",
-            "version": "4.0.0",
+            "version": "4.3.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/glob.git",
-                "reference": "732b4fc341f8dd418b0b9d8bff9b2458662cd382"
+                "url": "https://github.com/webmozarts/glob.git",
+                "reference": "06358fafde0f32edb4513f4fd88fe113a40c90ee"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/glob/zipball/732b4fc341f8dd418b0b9d8bff9b2458662cd382",
-                "reference": "732b4fc341f8dd418b0b9d8bff9b2458662cd382",
+                "url": "https://api.github.com/repos/webmozarts/glob/zipball/06358fafde0f32edb4513f4fd88fe113a40c90ee",
+                "reference": "06358fafde0f32edb4513f4fd88fe113a40c90ee",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3",
+                "php": "^7.3 || ^8.0.0",
                 "webmozart/path-util": "^2.2"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1",
-                "symfony/filesystem": "^2.5"
+                "phpunit/phpunit": "^8.0",
+                "symfony/filesystem": "^5.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
@@ -253,7 +287,11 @@
                 }
             ],
             "description": "A PHP implementation of Ant's glob.",
-            "time": "2015-12-28T09:48:22+00:00"
+            "support": {
+                "issues": "https://github.com/webmozarts/glob/issues",
+                "source": "https://github.com/webmozarts/glob/tree/4.3.0"
+            },
+            "time": "2021-01-21T06:17:15+00:00"
         },
         {
             "name": "webmozart/path-util",
@@ -299,6 +337,10 @@
                 }
             ],
             "description": "A robust cross-platform utility for normalizing, comparing and modifying file paths.",
+            "support": {
+                "issues": "https://github.com/webmozart/path-util/issues",
+                "source": "https://github.com/webmozart/path-util/tree/2.3.0"
+            },
             "time": "2015-12-17T08:42:14+00:00"
         }
     ],
@@ -352,6 +394,10 @@
                 "constructor",
                 "instantiate"
             ],
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.4.0"
+            },
             "funding": [
                 {
                     "url": "https://www.doctrine-project.org/sponsorship.html",
@@ -414,6 +460,10 @@
                 "object",
                 "object graph"
             ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+            },
             "funding": [
                 {
                     "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
@@ -424,16 +474,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.10.4",
+            "version": "v4.13.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "c6d052fc58cb876152f89f532b95a8d7907e7f0e"
+                "reference": "50953a2691a922aa1769461637869a0a2faa3f53"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/c6d052fc58cb876152f89f532b95a8d7907e7f0e",
-                "reference": "c6d052fc58cb876152f89f532b95a8d7907e7f0e",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/50953a2691a922aa1769461637869a0a2faa3f53",
+                "reference": "50953a2691a922aa1769461637869a0a2faa3f53",
                 "shasum": ""
             },
             "require": {
@@ -472,20 +522,24 @@
                 "parser",
                 "php"
             ],
-            "time": "2020-12-20T10:01:03+00:00"
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.13.0"
+            },
+            "time": "2021-09-20T12:20:58+00:00"
         },
         {
             "name": "phar-io/manifest",
-            "version": "2.0.1",
+            "version": "2.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133"
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
-                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/97803eca37d319dfa7826cc2437fc020857acb53",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53",
                 "shasum": ""
             },
             "require": {
@@ -528,20 +582,24 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2020-06-27T14:33:11+00:00"
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.3"
+            },
+            "time": "2021-07-20T11:28:43+00:00"
         },
         {
             "name": "phar-io/version",
-            "version": "3.0.4",
+            "version": "3.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "e4782611070e50613683d2b9a57730e9a3ba5451"
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/version/zipball/e4782611070e50613683d2b9a57730e9a3ba5451",
-                "reference": "e4782611070e50613683d2b9a57730e9a3ba5451",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/bae7c545bef187884426f042434e561ab1ddb182",
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182",
                 "shasum": ""
             },
             "require": {
@@ -575,7 +633,11 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2020-12-13T23:18:30+00:00"
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.1.0"
+            },
+            "time": "2021-02-23T14:00:09+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
@@ -624,6 +686,10 @@
                 "reflection",
                 "static analysis"
             ],
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionCommon/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionCommon/tree/2.x"
+            },
             "time": "2020-06-27T09:03:43+00:00"
         },
         {
@@ -676,20 +742,24 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionDocBlock/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionDocBlock/tree/master"
+            },
             "time": "2020-09-03T19:13:55+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "1.4.0",
+            "version": "1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0"
+                "reference": "30f38bffc6f24293dadd1823936372dfa9e86e2f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
-                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/30f38bffc6f24293dadd1823936372dfa9e86e2f",
+                "reference": "30f38bffc6f24293dadd1823936372dfa9e86e2f",
                 "shasum": ""
             },
             "require": {
@@ -697,7 +767,8 @@
                 "phpdocumentor/reflection-common": "^2.0"
             },
             "require-dev": {
-                "ext-tokenizer": "*"
+                "ext-tokenizer": "*",
+                "psalm/phar": "^4.8"
             },
             "type": "library",
             "extra": {
@@ -721,37 +792,41 @@
                 }
             ],
             "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
-            "time": "2020-09-17T18:55:26+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/TypeResolver/issues",
+                "source": "https://github.com/phpDocumentor/TypeResolver/tree/1.5.0"
+            },
+            "time": "2021-09-17T15:28:14+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.12.2",
+            "version": "1.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "245710e971a030f42e08f4912863805570f23d39"
+                "reference": "d86dfc2e2a3cd366cee475e52c6bb3bbc371aa0e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/245710e971a030f42e08f4912863805570f23d39",
-                "reference": "245710e971a030f42e08f4912863805570f23d39",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/d86dfc2e2a3cd366cee475e52c6bb3bbc371aa0e",
+                "reference": "d86dfc2e2a3cd366cee475e52c6bb3bbc371aa0e",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.2",
-                "php": "^7.2 || ~8.0, <8.1",
+                "php": "^7.2 || ~8.0, <8.2",
                 "phpdocumentor/reflection-docblock": "^5.2",
                 "sebastian/comparator": "^3.0 || ^4.0",
                 "sebastian/recursion-context": "^3.0 || ^4.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^6.0",
+                "phpspec/phpspec": "^6.0 || ^7.0",
                 "phpunit/phpunit": "^8.0 || ^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.11.x-dev"
+                    "dev-master": "1.x-dev"
                 }
             },
             "autoload": {
@@ -784,20 +859,24 @@
                 "spy",
                 "stub"
             ],
-            "time": "2020-12-19T10:15:11+00:00"
+            "support": {
+                "issues": "https://github.com/phpspec/prophecy/issues",
+                "source": "https://github.com/phpspec/prophecy/tree/1.14.0"
+            },
+            "time": "2021-09-10T09:02:12+00:00"
         },
         {
             "name": "phpstan/phpstan",
-            "version": "0.12.64",
+            "version": "0.12.99",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "23eb1cb7ae125f45f1d0e48051bcf67a9a9b08aa"
+                "reference": "b4d40f1d759942f523be267a1bab6884f46ca3f7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/23eb1cb7ae125f45f1d0e48051bcf67a9a9b08aa",
-                "reference": "23eb1cb7ae125f45f1d0e48051bcf67a9a9b08aa",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/b4d40f1d759942f523be267a1bab6884f46ca3f7",
+                "reference": "b4d40f1d759942f523be267a1bab6884f46ca3f7",
                 "shasum": ""
             },
             "require": {
@@ -826,11 +905,19 @@
                 "MIT"
             ],
             "description": "PHPStan - PHP Static Analysis Tool",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "source": "https://github.com/phpstan/phpstan/tree/0.12.99"
+            },
             "funding": [
                 {
                     "url": "https://github.com/ondrejmirtes",
                     "type": "github"
                 },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
                 {
                     "url": "https://www.patreon.com/phpstan",
                     "type": "patreon"
@@ -840,27 +927,27 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-12-21T11:59:02+00:00"
+            "time": "2021-09-12T20:09:55+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "9.2.5",
+            "version": "9.2.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "f3e026641cc91909d421802dd3ac7827ebfd97e1"
+                "reference": "d4c798ed8d51506800b441f7a13ecb0f76f12218"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/f3e026641cc91909d421802dd3ac7827ebfd97e1",
-                "reference": "f3e026641cc91909d421802dd3ac7827ebfd97e1",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/d4c798ed8d51506800b441f7a13ecb0f76f12218",
+                "reference": "d4c798ed8d51506800b441f7a13ecb0f76f12218",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-libxml": "*",
                 "ext-xmlwriter": "*",
-                "nikic/php-parser": "^4.10.2",
+                "nikic/php-parser": "^4.12.0",
                 "php": ">=7.3",
                 "phpunit/php-file-iterator": "^3.0.3",
                 "phpunit/php-text-template": "^2.0.2",
@@ -907,13 +994,17 @@
                 "testing",
                 "xunit"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.7"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
                     "type": "github"
                 }
             ],
-            "time": "2020-11-28T06:44:49+00:00"
+            "time": "2021-09-17T05:39:03+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -963,6 +1054,10 @@
                 "filesystem",
                 "iterator"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.5"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1022,6 +1117,10 @@
             "keywords": [
                 "process"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/3.1.1"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1077,6 +1176,10 @@
             "keywords": [
                 "template"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-text-template/issues",
+                "source": "https://github.com/sebastianbergmann/php-text-template/tree/2.0.4"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1132,6 +1235,10 @@
             "keywords": [
                 "timer"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-timer/issues",
+                "source": "https://github.com/sebastianbergmann/php-timer/tree/5.0.3"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1142,16 +1249,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "9.5.0",
+            "version": "9.5.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "8e16c225d57c3d6808014df6b1dd7598d0a5bbbe"
+                "reference": "c814a05837f2edb0d1471d6e3f4ab3501ca3899a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/8e16c225d57c3d6808014df6b1dd7598d0a5bbbe",
-                "reference": "8e16c225d57c3d6808014df6b1dd7598d0a5bbbe",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/c814a05837f2edb0d1471d6e3f4ab3501ca3899a",
+                "reference": "c814a05837f2edb0d1471d6e3f4ab3501ca3899a",
                 "shasum": ""
             },
             "require": {
@@ -1163,11 +1270,11 @@
                 "ext-xml": "*",
                 "ext-xmlwriter": "*",
                 "myclabs/deep-copy": "^1.10.1",
-                "phar-io/manifest": "^2.0.1",
+                "phar-io/manifest": "^2.0.3",
                 "phar-io/version": "^3.0.2",
                 "php": ">=7.3",
                 "phpspec/prophecy": "^1.12.1",
-                "phpunit/php-code-coverage": "^9.2.3",
+                "phpunit/php-code-coverage": "^9.2.7",
                 "phpunit/php-file-iterator": "^3.0.5",
                 "phpunit/php-invoker": "^3.1.1",
                 "phpunit/php-text-template": "^2.0.3",
@@ -1181,7 +1288,7 @@
                 "sebastian/global-state": "^5.0.1",
                 "sebastian/object-enumerator": "^4.0.3",
                 "sebastian/resource-operations": "^3.0.3",
-                "sebastian/type": "^2.3",
+                "sebastian/type": "^2.3.4",
                 "sebastian/version": "^3.0.2"
             },
             "require-dev": {
@@ -1227,6 +1334,10 @@
                 "testing",
                 "xunit"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/phpunit/issues",
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.10"
+            },
             "funding": [
                 {
                     "url": "https://phpunit.de/donate.html",
@@ -1237,7 +1348,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-12-04T05:05:53+00:00"
+            "time": "2021-09-25T07:38:51+00:00"
         },
         {
             "name": "sebastian/cli-parser",
@@ -1283,6 +1394,10 @@
             ],
             "description": "Library for parsing CLI options",
             "homepage": "https://github.com/sebastianbergmann/cli-parser",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/cli-parser/issues",
+                "source": "https://github.com/sebastianbergmann/cli-parser/tree/1.0.1"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1335,6 +1450,10 @@
             ],
             "description": "Collection of value objects that represent the PHP code units",
             "homepage": "https://github.com/sebastianbergmann/code-unit",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/code-unit/issues",
+                "source": "https://github.com/sebastianbergmann/code-unit/tree/1.0.8"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1386,6 +1505,10 @@
             ],
             "description": "Looks up which function or method a line of code belongs to",
             "homepage": "https://github.com/sebastianbergmann/code-unit-reverse-lookup/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/code-unit-reverse-lookup/issues",
+                "source": "https://github.com/sebastianbergmann/code-unit-reverse-lookup/tree/2.0.3"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1456,6 +1579,10 @@
                 "compare",
                 "equality"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/comparator/issues",
+                "source": "https://github.com/sebastianbergmann/comparator/tree/4.0.6"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1509,6 +1636,10 @@
             ],
             "description": "Library for calculating the complexity of PHP code units",
             "homepage": "https://github.com/sebastianbergmann/complexity",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/complexity/issues",
+                "source": "https://github.com/sebastianbergmann/complexity/tree/2.0.2"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1571,6 +1702,10 @@
                 "unidiff",
                 "unified diff"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/diff/issues",
+                "source": "https://github.com/sebastianbergmann/diff/tree/4.0.4"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1630,6 +1765,10 @@
                 "environment",
                 "hhvm"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/environment/issues",
+                "source": "https://github.com/sebastianbergmann/environment/tree/5.1.3"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1703,6 +1842,10 @@
                 "export",
                 "exporter"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/exporter/issues",
+                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.3"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1713,16 +1856,16 @@
         },
         {
             "name": "sebastian/global-state",
-            "version": "5.0.2",
+            "version": "5.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/global-state.git",
-                "reference": "a90ccbddffa067b51f574dea6eb25d5680839455"
+                "reference": "23bd5951f7ff26f12d4e3242864df3e08dec4e49"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/a90ccbddffa067b51f574dea6eb25d5680839455",
-                "reference": "a90ccbddffa067b51f574dea6eb25d5680839455",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/23bd5951f7ff26f12d4e3242864df3e08dec4e49",
+                "reference": "23bd5951f7ff26f12d4e3242864df3e08dec4e49",
                 "shasum": ""
             },
             "require": {
@@ -1763,13 +1906,17 @@
             "keywords": [
                 "global state"
             ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/5.0.3"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
                     "type": "github"
                 }
             ],
-            "time": "2020-10-26T15:55:19+00:00"
+            "time": "2021-06-11T13:31:12+00:00"
         },
         {
             "name": "sebastian/lines-of-code",
@@ -1816,6 +1963,10 @@
             ],
             "description": "Library for counting the lines of code in PHP source code",
             "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/1.0.3"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1869,6 +2020,10 @@
             ],
             "description": "Traverses array structures and object graphs to enumerate all referenced objects",
             "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/4.0.4"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1920,6 +2075,10 @@
             ],
             "description": "Allows reflection of object attributes, including inherited and non-public ones",
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/2.0.4"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -1979,6 +2138,10 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/4.0.4"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -2030,6 +2193,10 @@
             ],
             "description": "Provides a list of PHP built-in functions that operate on resources",
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.3"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -2040,16 +2207,16 @@
         },
         {
             "name": "sebastian/type",
-            "version": "2.3.1",
+            "version": "2.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/type.git",
-                "reference": "81cd61ab7bbf2de744aba0ea61fae32f721df3d2"
+                "reference": "b8cd8a1c753c90bc1a0f5372170e3e489136f914"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/81cd61ab7bbf2de744aba0ea61fae32f721df3d2",
-                "reference": "81cd61ab7bbf2de744aba0ea61fae32f721df3d2",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/b8cd8a1c753c90bc1a0f5372170e3e489136f914",
+                "reference": "b8cd8a1c753c90bc1a0f5372170e3e489136f914",
                 "shasum": ""
             },
             "require": {
@@ -2082,13 +2249,17 @@
             ],
             "description": "Collection of value objects that represent the types of the PHP type system",
             "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/2.3.4"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
                     "type": "github"
                 }
             ],
-            "time": "2020-10-26T13:18:59+00:00"
+            "time": "2021-06-15T12:49:02+00:00"
         },
         {
             "name": "sebastian/version",
@@ -2131,6 +2302,10 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
+            },
             "funding": [
                 {
                     "url": "https://github.com/sebastianbergmann",
@@ -2141,16 +2316,16 @@
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.2.0",
+            "version": "1.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "75a63c33a8577608444246075ea0af0d052e452a"
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/75a63c33a8577608444246075ea0af0d052e452a",
-                "reference": "75a63c33a8577608444246075ea0af0d052e452a",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
                 "shasum": ""
             },
             "require": {
@@ -2177,13 +2352,17 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+            },
             "funding": [
                 {
                     "url": "https://github.com/theseer",
                     "type": "github"
                 }
             ],
-            "time": "2020-07-12T23:59:07+00:00"
+            "time": "2021-07-28T10:34:58+00:00"
         }
     ],
     "aliases": [],
@@ -2192,8 +2371,8 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.2"
+        "php": ">=8.0"
     },
     "platform-dev": [],
-    "plugin-api-version": "1.1.0"
+    "plugin-api-version": "2.0.0"
 }
diff --git a/src/AbstractSync.php b/src/AbstractSync.php
index 6756987..783bbbc 100644
--- a/src/AbstractSync.php
+++ b/src/AbstractSync.php
@@ -2,13 +2,10 @@
 namespace Gt\Sync;
 
 abstract class AbstractSync {
-	protected $source;
-	protected $destination;
-
-	public function __construct(string $source, string $destination) {
-		$this->source = $source;
-		$this->destination = $destination;
-	}
+	public function __construct(
+		protected string $source,
+		protected string $destination
+	) {}
 
 	abstract public function exec(int $settings = 0):void;
-}
\ No newline at end of file
+}
diff --git a/src/DirectorySync.php b/src/DirectorySync.php
index 675e662..8bdd19d 100644
--- a/src/DirectorySync.php
+++ b/src/DirectorySync.php
@@ -14,15 +14,17 @@ class DirectorySync extends AbstractSync {
 
 	const DEFAULT_SETTINGS = self::COMPARE_FILEMTIME;
 
-	protected $copiedFiles;
-	protected $skippedFiles;
-	protected $deletedFiles;
-	protected $glob;
+	/** @var array<string> */
+	protected array $copiedFiles;
+	/** @var array<string> */
+	protected array $skippedFiles;
+	/** @var array<string> */
+	protected array $deletedFiles;
 
 	public function __construct(
-		string $source,
-		string $destination,
-		string $pattern = null
+		protected string $source,
+		protected string $destination,
+		private string $glob = "**/*"
 	) {
 		$source = Path::makeAbsolute($source, getcwd());
 		$destination = Path::makeAbsolute($destination, getcwd());
@@ -32,17 +34,6 @@ public function __construct(
 		if(!is_dir($source)) {
 			throw new SyncException("Source directory does not exist: $source");
 		}
-
-		if($pattern) {
-			$this->setPattern($pattern);
-		}
-		else {
-			$this->glob = "**/*";
-		}
-	}
-
-	public function setPattern(string $glob):void {
-		$this->glob = $glob;
 	}
 
 	/**
@@ -107,7 +98,7 @@ public function exec(int $settings = self::DEFAULT_SETTINGS):void {
 
 			if(!$this->sourceFileExists($relativePath)) {
 				$this->delete($relativePath);
-				$this->deletedFiles []= $relativePath;
+				array_push($this->deletedFiles, $relativePath);
 			}
 		}
 
@@ -132,12 +123,12 @@ public function exec(int $settings = self::DEFAULT_SETTINGS):void {
 
 			if($filesAreIdentical
 			|| !$this->fileMatchesGlob($relativePath)) {
-				$this->skippedFiles []= $relativePath;
+				array_push($this->skippedFiles, $relativePath);
 				continue;
 			}
 
 			$this->copy($relativePath);
-			$this->copiedFiles []= $relativePath;
+			array_push($this->copiedFiles, $relativePath);
 		}
 
 		if(!empty($this->copiedFiles)
@@ -146,14 +137,17 @@ public function exec(int $settings = self::DEFAULT_SETTINGS):void {
 		}
 	}
 
+	/** @return array<string> */
 	public function getCopiedFilesList():array {
 		return $this->copiedFiles;
 	}
 
+	/** @return array<string> */
 	public function getSkippedFilesList():array {
 		return $this->skippedFiles;
 	}
 
+	/** @return array<string> */
 	public function getDeletedFilesList():array {
 		return $this->deletedFiles;
 	}
@@ -255,4 +249,4 @@ protected function checkSettings(int $settings):void {
 			throw new SyncException("Cannot compare both filemtime and hash.");
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/test/phpunit/DirectorySyncTest.php b/test/phpunit/DirectorySyncTest.php
index cafabad..660620d 100644
--- a/test/phpunit/DirectorySyncTest.php
+++ b/test/phpunit/DirectorySyncTest.php
@@ -42,13 +42,13 @@ public function tearDown():void {
 		}
 	}
 
-	public function testSourceNotExists() {
+	public function testSourceNotExists():void {
 		self::expectException(SyncException::class);
 		self::expectExceptionMessage("Source directory does not exist");
 		new DirectorySync($this->getRandomTmp(), $this->getRandomTmp());
 	}
 
-	public function testDestinationNotExists() {
+	public function testDestinationNotExists():void {
 		$source = $this->getRandomTmp();
 		mkdir($source, 0775, true);
 		$dest = $this->getRandomTmp();
@@ -59,7 +59,7 @@ public function testDestinationNotExists() {
 		self::assertDirectoryExists($dest);
 	}
 
-	public function testCopy() {
+	public function testCopy():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -71,7 +71,7 @@ public function testCopy() {
 		self::assertDirectoryContentsIdentical($source, $dest);
 	}
 
-	public function testCopyNewFileTouched() {
+	public function testCopyNewFileTouched():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -90,7 +90,7 @@ public function testCopyNewFileTouched() {
 		self::assertDirectoryContentsIdentical($source, $dest);
 	}
 
-	public function testCopyNewFileEditedNotCheckedByDefault() {
+	public function testCopyNewFileEditedNotCheckedByDefault():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -109,14 +109,14 @@ public function testCopyNewFileEditedNotCheckedByDefault() {
 		self::assertDirectoryContentsIdentical($source, $dest);
 	}
 
-	public function testDeleteFiles() {
+	public function testDeleteFiles():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
 		$numFiles = rand(10, 250);
 		$this->createRandomFiles($source, $numFiles);
 		$filesToDelete = [];
-		$numFilesToDelete = rand(1, round($numFiles / 5));
+		$numFilesToDelete = rand(1, (int)round($numFiles / 5));
 		for($i = 0; $i < $numFilesToDelete; $i++) {
 			$f = $this->getRandomFileFromDirectory($source);
 			if(!in_array($f, $filesToDelete)) {
@@ -138,7 +138,7 @@ public function testDeleteFiles() {
 		self::assertDirectoryContentsIdentical($source, $dest);
 	}
 
-	public function testDeleteDirectory() {
+	public function testDeleteDirectory():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -155,7 +155,7 @@ public function testDeleteDirectory() {
 		self::assertDirectoryContentsIdentical($source, $dest);
 	}
 
-	public function testCopyWrongConfig() {
+	public function testCopyWrongConfig():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -168,7 +168,7 @@ public function testCopyWrongConfig() {
 		);
 	}
 
-	public function testGetCopiedFilesList() {
+	public function testGetCopiedFilesList():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -183,11 +183,11 @@ public function testGetCopiedFilesList() {
 		self::assertCount(0, $sut->getCopiedFilesList());
 	}
 
-	public function testGetDeletedFilesList() {
+	public function testGetDeletedFilesList():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
-		$sourceFileList = $this->createRandomFiles($source);
+		$this->createRandomFiles($source);
 		$sut = new DirectorySync($source, $dest);
 		$sut->exec();
 
@@ -199,7 +199,7 @@ public function testGetDeletedFilesList() {
 		self::assertCount(1, $sut->getDeletedFilesList());
 	}
 
-	public function testGetSkippedFilesList() {
+	public function testGetSkippedFilesList():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -215,7 +215,7 @@ public function testGetSkippedFilesList() {
 		self::assertCount(count($sourceFileList), $skippedFilesList);
 	}
 
-	public function testCheck() {
+	public function testCheck():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -227,7 +227,7 @@ public function testCheck() {
 		self::assertTrue($sut->check());
 	}
 
-	public function testSetPattern() {
+	public function testSetPattern():void {
 		$source = $this->getRandomTmp();
 		$dest = $this->getRandomTmp();
 		mkdir($source, 0775, true);
@@ -248,8 +248,7 @@ public function testSetPattern() {
 		rename($file2, $file2 . "match");
 		rename($file3, $file3 . "match");
 
-		$sut = new DirectorySync($source, $dest);
-		$sut->setPattern("**/*.filematch");
+		$sut = new DirectorySync($source, $dest, "**/*.filematch");
 		$sut->exec();
 		$copiedFiles = $sut->getCopiedFilesList();
 		self::assertCount(3, $copiedFiles);
@@ -259,6 +258,7 @@ public function testSetPattern() {
 		self::assertCount(0, $copiedFiles);
 	}
 
+	/** @return array<string> */
 	protected function createRandomFiles(
 		string $directory,
 		int $numFiles = 100,
@@ -287,7 +287,7 @@ protected function createRandomFiles(
 				mkdir(dirname($path), 0775, true);
 			}
 			file_put_contents($path, uniqid("content-"));
-			$fileList []= $path;
+			array_push($fileList, $path);
 		}
 
 		return $fileList;
@@ -305,6 +305,8 @@ protected function getRandomFileFromDirectory(string $dir):string {
 			}
 		}
 		while($fileList);
+
+		return "";
 	}
 
 	protected function getRandomSubdirectoryFromDirectory(string $dir):string {
@@ -317,7 +319,7 @@ protected function getRandomSubdirectoryFromDirectory(string $dir):string {
 		return $file;
 	}
 
-	protected function recursiveDeleteDirectory(string $dir) {
+	protected function recursiveDeleteDirectory(string $dir):void{
 		$directory = new RecursiveDirectoryIterator(
 			$dir,
 			RecursiveDirectoryIterator::SKIP_DOTS
@@ -501,4 +503,4 @@ protected static function assertDirectoryContentsNotIdentical(
 			true
 		);
 	}
-}
\ No newline at end of file
+}