diff --git a/.gitattributes b/.gitattributes
index 8fcdc8f..19028cd 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -5,3 +5,5 @@
 /.php-cs-fixer.php  export-ignore
 /composer.lock      export-ignore
 /Makefile           export-ignore
+/psalm-baseline.xml export-ignore
+/psalm.xml          export-ignore
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index f8924a7..2332e53 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -18,6 +18,30 @@ make coding-standards
 
 to automatically fix coding standard violations.
 
+## Static Code Analysis
+
+We are using [`vimeo/psalm`](https://github.com/vimeo/psalm) to statically analyze the code.
+
+Run
+
+```sh
+make static-code-analysis
+```
+
+to run a static code analysis.
+
+We are also using the baseline feature of [`vimeo/psalm`](https://psalm.dev/docs/running_psalm/dealing_with_code_issues/#using-a-baseline-file).
+
+Run
+
+```sh
+make static-code-analysis-baseline
+```
+
+to regenerate the baseline in [`../psalm-baseline.xml`](../psalm-baseline.xml).
+
+:exclamation: Ideally, the baseline should shrink over time.
+
 ## Extra lazy?
 
 Run
@@ -26,7 +50,8 @@ Run
 make
 ```
 
-to automatically enforce coding standards!
+to automatically enforce coding standards and run a static code analysis!
+
 
 ## Help
 
diff --git a/.github/workflows/integrate.yaml b/.github/workflows/integrate.yaml
index 5cb394a..eaf2366 100644
--- a/.github/workflows/integrate.yaml
+++ b/.github/workflows/integrate.yaml
@@ -65,3 +65,54 @@ jobs:
 
       - name: "Run friendsofphp/php-cs-fixer"
         run: "vendor/bin/php-cs-fixer fix --ansi --config=.php-cs-fixer.php --diff --dry-run --verbose"
+
+  static-code-analysis:
+    name: "Static Code Analysis"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "8.1"
+
+        dependencies:
+          - "locked"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3.5.2"
+
+      - name: "Set up PHP"
+        uses: "shivammathur/setup-php@2.25.1"
+        with:
+          coverage: "none"
+          extensions: "none, ctype, curl, dom, json, mbstring, opcache, pcntl, phar, posix, simplexml, tokenizer, xml, xmlwriter"
+          php-version: "${{ matrix.php-version }}"
+
+      - name: "Set up problem matchers for PHP"
+        run: "echo \"::add-matcher::${{ runner.tool_cache }}/php.json\""
+
+      - name: "Validate composer.json and composer.lock"
+        run: "composer validate --ansi --strict"
+
+      - name: "Determine composer cache directory"
+        uses: "ergebnis/.github/actions/composer/determine-cache-directory@1.8.0"
+
+      - name: "Cache dependencies installed with composer"
+        uses: "actions/cache@v3.3.1"
+        with:
+          path: "${{ env.COMPOSER_CACHE_DIR }}"
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
+
+      - name: "Install ${{ matrix.dependencies }} dependencies with composer"
+        uses: "ergebnis/.github/actions/composer/install@1.8.0"
+        with:
+          dependencies: "${{ matrix.dependencies }}"
+
+      - name: "Create cache directory for vimeo/psalm"
+        run: "mkdir -p .build/psalm"
+
+      - name: "Run vimeo/psalm"
+        run: "vendor/bin/psalm --config=psalm.xml --output-format=github --shepherd --show-info=false --stats --threads=4"
diff --git a/Makefile b/Makefile
index 1980f0e..01c1492 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 .PHONY: it
-it: coding-standards ## Runs the coding-standards target
+it: coding-standards static-code-analysis ## Runs the coding-standards and static-code-analysis targets
 
 .PHONY: coding-standards
 coding-standards: vendor ## Fixes code style issues with friendsofphp/php-cs-fixer
@@ -10,6 +10,18 @@ coding-standards: vendor ## Fixes code style issues with friendsofphp/php-cs-fix
 help: ## Displays this list of targets with descriptions
 	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[32m%-30s\033[0m %s\n", $$1, $$2}'
 
+.PHONY: static-code-analysis
+static-code-analysis: vendor ## Runs a static code analysis with vimeo/psalm
+	mkdir -p .build/psalm/
+	vendor/bin/psalm --config=psalm.xml --clear-cache
+	vendor/bin/psalm --config=psalm.xml --show-info=false --stats --threads=4
+
+.PHONY: static-code-analysis-baseline
+static-code-analysis-baseline: vendor ## Generates a baseline for static code analysis with vimeo/psalm
+	mkdir -p .build/psalm/
+	vendor/bin/psalm --config=psalm.xml --clear-cache
+	vendor/bin/psalm --config=psalm.xml --set-baseline=psalm-baseline.xml
+
 vendor: composer.json composer.lock
 	composer validate --strict
 	composer install --no-interaction --no-progress
diff --git a/composer.json b/composer.json
index dac15c6..b4d66f5 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,8 @@
     "php": "~8.0.0 || ~8.1.0 || ~8.2.0"
   },
   "require-dev": {
-    "ergebnis/php-cs-fixer-config": "^5.5.2"
+    "ergebnis/php-cs-fixer-config": "^5.5.2",
+    "vimeo/psalm": "^5.11.0"
   },
   "config": {
     "platform": {
diff --git a/composer.lock b/composer.lock
index 0ccbef3..6c1ace6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,9 +4,175 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "5c029b3b415563dbaadcbe074d7cf7e8",
+    "content-hash": "1645e728e8cec2766ee74d8a65cbec16",
     "packages": [],
     "packages-dev": [
+        {
+            "name": "amphp/amp",
+            "version": "v2.6.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/amp.git",
+                "reference": "9d5100cebffa729aaffecd3ad25dc5aeea4f13bb"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/amp/zipball/9d5100cebffa729aaffecd3ad25dc5aeea4f13bb",
+                "reference": "9d5100cebffa729aaffecd3ad25dc5aeea4f13bb",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1",
+                "ext-json": "*",
+                "jetbrains/phpstorm-stubs": "^2019.3",
+                "phpunit/phpunit": "^7 | ^8 | ^9",
+                "psalm/phar": "^3.11@dev",
+                "react/promise": "^2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "lib/functions.php",
+                    "lib/Internal/functions.php"
+                ],
+                "psr-4": {
+                    "Amp\\": "lib"
+                }
+            },
+            "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": "https://amphp.org/amp",
+            "keywords": [
+                "async",
+                "asynchronous",
+                "awaitable",
+                "concurrency",
+                "event",
+                "event-loop",
+                "future",
+                "non-blocking",
+                "promise"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/amphp",
+                "issues": "https://github.com/amphp/amp/issues",
+                "source": "https://github.com/amphp/amp/tree/v2.6.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/amphp",
+                    "type": "github"
+                }
+            ],
+            "time": "2022-02-20T17:52:18+00:00"
+        },
+        {
+            "name": "amphp/byte-stream",
+            "version": "v1.8.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/byte-stream.git",
+                "reference": "acbd8002b3536485c997c4e019206b3f10ca15bd"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/acbd8002b3536485c997c4e019206b3f10ca15bd",
+                "reference": "acbd8002b3536485c997c4e019206b3f10ca15bd",
+                "shasum": ""
+            },
+            "require": {
+                "amphp/amp": "^2",
+                "php": ">=7.1"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1.4",
+                "friendsofphp/php-cs-fixer": "^2.3",
+                "jetbrains/phpstorm-stubs": "^2019.3",
+                "phpunit/phpunit": "^6 || ^7 || ^8",
+                "psalm/phar": "^3.11.4"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "lib/functions.php"
+                ],
+                "psr-4": {
+                    "Amp\\ByteStream\\": "lib"
+                }
+            },
+            "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"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/amphp",
+                "issues": "https://github.com/amphp/byte-stream/issues",
+                "source": "https://github.com/amphp/byte-stream/tree/v1.8.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/amphp",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-30T17:13:30+00:00"
+        },
         {
             "name": "composer/pcre",
             "version": "3.1.0",
@@ -225,6 +391,43 @@
             ],
             "time": "2022-02-25T21:32:43+00:00"
         },
+        {
+            "name": "dnoegel/php-xdg-base-dir",
+            "version": "v0.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/dnoegel/php-xdg-base-dir.git",
+                "reference": "8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/dnoegel/php-xdg-base-dir/zipball/8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd",
+                "reference": "8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~7.0|~6.0|~5.0|~4.8.35"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "XdgBaseDir\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "implementation of xdg base directory specification for php",
+            "support": {
+                "issues": "https://github.com/dnoegel/php-xdg-base-dir/issues",
+                "source": "https://github.com/dnoegel/php-xdg-base-dir/tree/v0.1.1"
+            },
+            "time": "2019-12-04T15:06:13+00:00"
+        },
         {
             "name": "doctrine/annotations",
             "version": "2.0.1",
@@ -416,53 +619,525 @@
                     "type": "patreon"
                 },
                 {
-                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Flexer",
-                    "type": "tidelift"
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Flexer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-12-14T08:49:07+00:00"
+        },
+        {
+            "name": "ergebnis/php-cs-fixer-config",
+            "version": "5.5.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ergebnis/php-cs-fixer-config.git",
+                "reference": "b926460aa2a978dcb2cb6c8d79323d2abab27157"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ergebnis/php-cs-fixer-config/zipball/b926460aa2a978dcb2cb6c8d79323d2abab27157",
+                "reference": "b926460aa2a978dcb2cb6c8d79323d2abab27157",
+                "shasum": ""
+            },
+            "require": {
+                "ext-filter": "*",
+                "friendsofphp/php-cs-fixer": "~3.16.0",
+                "php": "~8.0.0 || ~8.1.0 || ~8.2.0"
+            },
+            "require-dev": {
+                "ergebnis/composer-normalize": "^2.30.2",
+                "ergebnis/license": "^2.1.0",
+                "fakerphp/faker": "^1.21.0",
+                "infection/infection": "~0.26.19",
+                "phpunit/phpunit": "^9.6.7",
+                "psalm/plugin-phpunit": "~0.18.4",
+                "rector/rector": "~0.15.25",
+                "symfony/filesystem": "^5.0.0 || ^6.0.0",
+                "symfony/process": "^5.0.0 || ^6.0.0",
+                "vimeo/psalm": "^5.9.0"
+            },
+            "type": "library",
+            "extra": {
+                "composer-normalize": {
+                    "indent-size": 2,
+                    "indent-style": "space"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Ergebnis\\PhpCsFixer\\Config\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Andreas Möller",
+                    "email": "am@localheinz.com"
+                }
+            ],
+            "description": "Provides a configuration factory and multiple rule sets for friendsofphp/php-cs-fixer.",
+            "homepage": "https://github.com/ergebnis/php-cs-fixer-config",
+            "support": {
+                "issues": "https://github.com/ergebnis/php-cs-fixer-config/issues",
+                "source": "https://github.com/ergebnis/php-cs-fixer-config"
+            },
+            "time": "2023-04-27T17:31:51+00:00"
+        },
+        {
+            "name": "felixfbecker/advanced-json-rpc",
+            "version": "v3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-advanced-json-rpc.git",
+                "reference": "b5f37dbff9a8ad360ca341f3240dc1c168b45447"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-advanced-json-rpc/zipball/b5f37dbff9a8ad360ca341f3240dc1c168b45447",
+                "reference": "b5f37dbff9a8ad360ca341f3240dc1c168b45447",
+                "shasum": ""
+            },
+            "require": {
+                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0 || ^4.0",
+                "php": "^7.1 || ^8.0",
+                "phpdocumentor/reflection-docblock": "^4.3.4 || ^5.0.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^7.0 || ^8.0"
+            },
+            "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",
+            "support": {
+                "issues": "https://github.com/felixfbecker/php-advanced-json-rpc/issues",
+                "source": "https://github.com/felixfbecker/php-advanced-json-rpc/tree/v3.2.1"
+            },
+            "time": "2021-06-11T22:34:44+00:00"
+        },
+        {
+            "name": "felixfbecker/language-server-protocol",
+            "version": "v1.5.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-language-server-protocol.git",
+                "reference": "6e82196ffd7c62f7794d778ca52b69feec9f2842"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/6e82196ffd7c62f7794d778ca52b69feec9f2842",
+                "reference": "6e82196ffd7c62f7794d778ca52b69feec9f2842",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "*",
+                "squizlabs/php_codesniffer": "^3.1",
+                "vimeo/psalm": "^4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "LanguageServerProtocol\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "ISC"
+            ],
+            "authors": [
+                {
+                    "name": "Felix Becker",
+                    "email": "felix.b@outlook.com"
+                }
+            ],
+            "description": "PHP classes for the Language Server Protocol",
+            "keywords": [
+                "language",
+                "microsoft",
+                "php",
+                "server"
+            ],
+            "support": {
+                "issues": "https://github.com/felixfbecker/php-language-server-protocol/issues",
+                "source": "https://github.com/felixfbecker/php-language-server-protocol/tree/v1.5.2"
+            },
+            "time": "2022-03-02T22:36:06+00:00"
+        },
+        {
+            "name": "fidry/cpu-core-counter",
+            "version": "0.5.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theofidry/cpu-core-counter.git",
+                "reference": "b58e5a3933e541dc286cc91fc4f3898bbc6f1623"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theofidry/cpu-core-counter/zipball/b58e5a3933e541dc286cc91fc4f3898bbc6f1623",
+                "reference": "b58e5a3933e541dc286cc91fc4f3898bbc6f1623",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "require-dev": {
+                "fidry/makefile": "^0.2.0",
+                "phpstan/extension-installer": "^1.2.0",
+                "phpstan/phpstan": "^1.9.2",
+                "phpstan/phpstan-deprecation-rules": "^1.0.0",
+                "phpstan/phpstan-phpunit": "^1.2.2",
+                "phpstan/phpstan-strict-rules": "^1.4.4",
+                "phpunit/phpunit": "^9.5.26 || ^8.5.31",
+                "theofidry/php-cs-fixer-config": "^1.0",
+                "webmozarts/strict-phpunit": "^7.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Fidry\\CpuCoreCounter\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Théo FIDRY",
+                    "email": "theo.fidry@gmail.com"
+                }
+            ],
+            "description": "Tiny utility to get the number of CPU cores.",
+            "keywords": [
+                "CPU",
+                "core"
+            ],
+            "support": {
+                "issues": "https://github.com/theofidry/cpu-core-counter/issues",
+                "source": "https://github.com/theofidry/cpu-core-counter/tree/0.5.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theofidry",
+                    "type": "github"
+                }
+            ],
+            "time": "2022-12-24T12:35:10+00:00"
+        },
+        {
+            "name": "friendsofphp/php-cs-fixer",
+            "version": "v3.16.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer.git",
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@@ -847,6 +1532,69 @@
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         {
             "name": "symfony/console",
             "version": "v6.0.19",
@@ -2143,6 +2891,170 @@
                 }
             ],
             "time": "2023-01-01T08:36:10+00:00"
+        },
+        {
+            "name": "vimeo/psalm",
+            "version": "5.11.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/vimeo/psalm.git",
+                "reference": "c9b192ab8400fdaf04b2b13d110575adc879aa90"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/c9b192ab8400fdaf04b2b13d110575adc879aa90",
+                "reference": "c9b192ab8400fdaf04b2b13d110575adc879aa90",
+                "shasum": ""
+            },
+            "require": {
+                "amphp/amp": "^2.4.2",
+                "amphp/byte-stream": "^1.5",
+                "composer-runtime-api": "^2",
+                "composer/semver": "^1.4 || ^2.0 || ^3.0",
+                "composer/xdebug-handler": "^2.0 || ^3.0",
+                "dnoegel/php-xdg-base-dir": "^0.1.1",
+                "ext-ctype": "*",
+                "ext-dom": "*",
+                "ext-json": "*",
+                "ext-libxml": "*",
+                "ext-mbstring": "*",
+                "ext-simplexml": "*",
+                "ext-tokenizer": "*",
+                "felixfbecker/advanced-json-rpc": "^3.1",
+                "felixfbecker/language-server-protocol": "^1.5.2",
+                "fidry/cpu-core-counter": "^0.4.1 || ^0.5.1",
+                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0 || ^4.0",
+                "nikic/php-parser": "^4.14",
+                "php": "^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0",
+                "sebastian/diff": "^4.0 || ^5.0",
+                "spatie/array-to-xml": "^2.17.0 || ^3.0",
+                "symfony/console": "^4.1.6 || ^5.0 || ^6.0",
+                "symfony/filesystem": "^5.4 || ^6.0"
+            },
+            "provide": {
+                "psalm/psalm": "self.version"
+            },
+            "require-dev": {
+                "amphp/phpunit-util": "^2.0",
+                "bamarni/composer-bin-plugin": "^1.4",
+                "brianium/paratest": "^6.9",
+                "ext-curl": "*",
+                "mockery/mockery": "^1.5",
+                "nunomaduro/mock-final-classes": "^1.1",
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/phpdoc-parser": "^1.6",
+                "phpunit/phpunit": "^9.6",
+                "psalm/plugin-mockery": "^1.1",
+                "psalm/plugin-phpunit": "^0.18",
+                "slevomat/coding-standard": "^8.4",
+                "squizlabs/php_codesniffer": "^3.6",
+                "symfony/process": "^4.4 || ^5.0 || ^6.0"
+            },
+            "suggest": {
+                "ext-curl": "In order to send data to shepherd",
+                "ext-igbinary": "^2.0.5 is required, used to serialize caching data"
+            },
+            "bin": [
+                "psalm",
+                "psalm-language-server",
+                "psalm-plugin",
+                "psalm-refactor",
+                "psalter"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.x-dev",
+                    "dev-4.x": "4.x-dev",
+                    "dev-3.x": "3.x-dev",
+                    "dev-2.x": "2.x-dev",
+                    "dev-1.x": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psalm\\": "src/Psalm/"
+                }
+            },
+            "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",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/vimeo/psalm/issues",
+                "source": "https://github.com/vimeo/psalm/tree/5.11.0"
+            },
+            "time": "2023-05-04T21:35:44+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.11.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "11cb2199493b2f8a3b53e7f19068fc6aac760991"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/11cb2199493b2f8a3b53e7f19068fc6aac760991",
+                "reference": "11cb2199493b2f8a3b53e7f19068fc6aac760991",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.5.13"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.11.0"
+            },
+            "time": "2022-06-03T18:03:27+00:00"
         }
     ],
     "aliases": [],
diff --git a/psalm-baseline.xml b/psalm-baseline.xml
new file mode 100644
index 0000000..e725e04
--- /dev/null
+++ b/psalm-baseline.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<files psalm-version="5.11.0@c9b192ab8400fdaf04b2b13d110575adc879aa90">
+  <file src="src/All.php">
+    <UnusedClass>
+      <code>All</code>
+    </UnusedClass>
+  </file>
+  <file src="src/RFC/RFC2616.php">
+    <UnusedClass>
+      <code>RFC2616</code>
+    </UnusedClass>
+  </file>
+  <file src="src/RFC/Stream/Independent.php">
+    <UnusedClass>
+      <code>Independent</code>
+    </UnusedClass>
+  </file>
+  <file src="src/Vendor/RFC7238.php">
+    <UnusedClass>
+      <code>RFC7238</code>
+    </UnusedClass>
+  </file>
+  <file src="src/Vendor/Symfony.php">
+    <DeprecatedClass>
+      <code>RFC2324::I_AM_A_TEAPOT</code>
+    </DeprecatedClass>
+    <DeprecatedConstant>
+      <code>RFC7231::UNUSED</code>
+      <code>RFC7231::USE_PROXY</code>
+    </DeprecatedConstant>
+    <UnusedClass>
+      <code>Symfony</code>
+    </UnusedClass>
+  </file>
+</files>
diff --git a/psalm.xml b/psalm.xml
new file mode 100644
index 0000000..0e3336b
--- /dev/null
+++ b/psalm.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0"?>
+<psalm
+    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"
+    cacheDirectory=".build/psalm"
+    errorBaseline="psalm-baseline.xml"
+    errorLevel="1"
+    findUnusedBaselineEntry="true"
+    findUnusedCode="true"
+    findUnusedVariablesAndParams="true"
+    resolveFromConfigFile="true"
+    strictBinaryOperands="true"
+>
+    <projectFiles>
+        <directory name="src/" />
+        <ignoreFiles>
+            <directory name="vendor/" />
+        </ignoreFiles>
+    </projectFiles>
+</psalm>