diff --git a/.editorconfig b/.editorconfig
index b6249fbb09..9a2273c794 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -5,6 +5,10 @@ charset = utf-8
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[*.xml]
+indent_size = 2
+indent_style = space
+
 [*.yaml]
 indent_size = 2
 indent_style = space
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 449c5c0e71..e7a6a16983 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -4,7 +4,7 @@ Anybody who programs in PHP can be a contributing member of the community that
 develops and deploys www.php.net; the task of deploying the www.php.net website is a never-ending one.
 
 You don't need any special access to download, debug and begin submitting
-code, tests or documentation. 
+code, tests or documentation.
 
 ## Index
 
@@ -74,6 +74,19 @@ about what you're working on, you can contact us via the
   ```
 
   to automatically fix coding standard issues.
+- Run
+
+  ```shell
+  make static-code-analysis
+  ```
+
+  to run a static code analysis or, if applicable, run
+
+  ```shell
+  make static-code-analysis-baseline
+  ```
+
+  to regenerate the baseline.
 - Review the change once more just before submitting it.
 
 ## What happens after submitting contribution?
@@ -93,7 +106,7 @@ bumping. Before doing this think about these questions:
 
 ## What happens when your contribution is applied?
 
-Your name will likely be included in the Git commit log. 
+Your name will likely be included in the Git commit log.
 
 ## Git commit rules
 
@@ -133,7 +146,20 @@ Having said that, here are the organizational rules:
    ```
    make coding-standards
    ```
+6. Run
+
+  ```shell
+  make static-code-analysis
+  ```
+
+  to run a static code analysis or, if applicable, run
+
+  ```shell
+  make static-code-analysis-baseline
+  ```
+
+  to regenerate the baseline.
 
-6. Use reasonable commit messages.
+7. Use reasonable commit messages.
 
 Thank you for contributing to https://www.php.net!
diff --git a/.github/workflows/integrate.yaml b/.github/workflows/integrate.yaml
index deaa8320da..20135028e7 100644
--- a/.github/workflows/integrate.yaml
+++ b/.github/workflows/integrate.yaml
@@ -27,7 +27,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          extensions: "none, curl, json, mbstring, tokenizer"
+          extensions: "none, curl, dom, json, mbstring, simplexml, tokenizer"
           php-version: "${{ matrix.php-version }}"
 
       - name: "Set up problem matchers for PHP"
@@ -54,6 +54,49 @@ jobs:
         env:
           PHP_CS_FIXER_IGNORE_ENV: "1"
 
+  static-code-analysis:
+    name: "Static Code Analysis"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "8.2"
+
+        dependencies:
+          - "locked"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3"
+
+      - name: "Set up PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          extensions: "none, dom, json, mbstring, opcache, pcntl, posix, simplexml, tokenizer"
+          php-version: "${{ matrix.php-version }}"
+
+      - name: "Set up problem matchers for PHP"
+        run: "echo \"::add-matcher::${{ runner.tool_cache }}/php.json\""
+
+      - name: "Determine composer cache directory"
+        run: "echo \"COMPOSER_CACHE_DIR=$(composer config cache-dir)\" >> $GITHUB_ENV"
+
+      - name: "Cache dependencies installed with composer"
+        uses: "actions/cache@v3"
+        with:
+          path: "${{ env.COMPOSER_CACHE_DIR }}"
+          key: "php-${{ matrix.php-version }}-composer-${{ hashFiles('composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-"
+
+      - name: "Install dependencies with composer"
+        run: "composer install --ansi --no-interaction --no-progress"
+
+      - name: "Run vimeo/psalm"
+        run: "vendor/bin/psalm --config=psalm.xml --output-format=github --shepherd --show-info=false --stats --threads=4"
+
   tests:
     name: "Tests"
 
diff --git a/.gitignore b/.gitignore
index 2cf2664861..a1bdda0fa5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/.build/
 /vendor/
 
 backend/mirror.gif
diff --git a/Makefile b/Makefile
index 505d6ac764..36d2211c7e 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,18 @@ coding-standards: vendor ## Fixes code style issues with friendsofphp/php-cs-fix
 tests: vendor ## Runs tests
 	tests/server start; php tests/run-tests.php -j3 -q; tests/server stop
 
+.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=true --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/README.md b/README.md
index 39b7c4c47b..80ed7f1091 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 [![Integrate](https://github.com/php/web-php/actions/workflows/integrate.yaml/badge.svg)](https://github.com/php/web-php/actions/workflows/integrate.yaml)
+[![Type Coverage](https://shepherd.dev/github/php/web-php/coverage.svg)](https://shepherd.dev/github/php/web-php)
 
 ## Local development
 
diff --git a/composer.json b/composer.json
index 828a9c4890..8c2a641475 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,8 @@
     },
     "require-dev": {
         "ext-curl": "*",
-        "friendsofphp/php-cs-fixer": "^3.40.2"
+        "friendsofphp/php-cs-fixer": "^3.40.2",
+        "vimeo/psalm": "^5.21.1"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
index ce9b352127..dbe34bafa4 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": "c5d7affcdce069dec449e3bf7d31be2b",
+    "content-hash": "c0a923997ce2a48e0468ea7c95437de6",
     "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": "3.1.1",
@@ -157,36 +323,607 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-08-31T09:50:34+00:00"
+            "time": "2023-08-31T09:50:34+00:00"
+        },
+        {
+            "name": "composer/xdebug-handler",
+            "version": "3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/xdebug-handler.git",
+                "reference": "ced299686f41dce890debac69273b47ffe98a40c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/ced299686f41dce890debac69273b47ffe98a40c",
+                "reference": "ced299686f41dce890debac69273b47ffe98a40c",
+                "shasum": ""
+            },
+            "require": {
+                "composer/pcre": "^1 || ^2 || ^3",
+                "php": "^7.2.5 || ^8.0",
+                "psr/log": "^1 || ^2 || ^3"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.0",
+                "phpstan/phpstan-strict-rules": "^1.1",
+                "symfony/phpunit-bridge": "^6.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Composer\\XdebugHandler\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Stevenson",
+                    "email": "john-stevenson@blueyonder.co.uk"
+                }
+            ],
+            "description": "Restarts a process without Xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/xdebug-handler/issues",
+                "source": "https://github.com/composer/xdebug-handler/tree/3.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "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/deprecations",
+            "version": "1.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/deprecations.git",
+                "reference": "dfbaa3c2d2e9a9df1118213f3b8b0c597bb99fab"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/deprecations/zipball/dfbaa3c2d2e9a9df1118213f3b8b0c597bb99fab",
+                "reference": "dfbaa3c2d2e9a9df1118213f3b8b0c597bb99fab",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/coding-standard": "^9",
+                "phpstan/phpstan": "1.4.10 || 1.10.15",
+                "phpstan/phpstan-phpunit": "^1.0",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+                "psalm/plugin-phpunit": "0.18.4",
+                "psr/log": "^1 || ^2 || ^3",
+                "vimeo/psalm": "4.30.0 || 5.12.0"
+            },
+            "suggest": {
+                "psr/log": "Allows logging deprecations via PSR-3 logger implementation"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Deprecations\\": "lib/Doctrine/Deprecations"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "A small layer on top of trigger_error(E_USER_DEPRECATED) or PSR-3 logging with options to disable all deprecations or selectively for packages.",
+            "homepage": "https://www.doctrine-project.org/",
+            "support": {
+                "issues": "https://github.com/doctrine/deprecations/issues",
+                "source": "https://github.com/doctrine/deprecations/tree/1.1.3"
+            },
+            "time": "2024-01-30T19:34:25+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": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theofidry/cpu-core-counter.git",
+                "reference": "85193c0b0cb5c47894b5eaec906e946f054e7077"
+            },
+            "dist": {
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+                "url": "https://github.com/spatie/array-to-xml.git",
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+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/spatie/array-to-xml/zipball/96be97e664c87613121d073ea39af4c74e57a7f8",
+                "reference": "96be97e664c87613121d073ea39af4c74e57a7f8",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "php": "^8.0"
+            },
+            "require-dev": {
+                "mockery/mockery": "^1.2",
+                "pestphp/pest": "^1.21",
+                "spatie/pest-plugin-snapshots": "^1.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Spatie\\ArrayToXml\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Freek Van der Herten",
+                    "email": "freek@spatie.be",
+                    "homepage": "https://freek.dev",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Convert an array to xml",
+            "homepage": "https://github.com/spatie/array-to-xml",
+            "keywords": [
+                "array",
+                "convert",
+                "xml"
+            ],
+            "support": {
+                "source": "https://github.com/spatie/array-to-xml/tree/3.2.2"
+            },
+            "funding": [
+                {
+                    "url": "https://spatie.be/open-source/support-us",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/spatie",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-11-14T14:08:51+00:00"
+        },
         {
             "name": "symfony/console",
             "version": "v7.0.1",
@@ -1830,6 +2627,174 @@
                 }
             ],
             "time": "2023-11-29T08:40:23+00:00"
+        },
+        {
+            "name": "vimeo/psalm",
+            "version": "5.21.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/vimeo/psalm.git",
+                "reference": "8c473e2437be8b6a8fd8f630f0f11a16b114c494"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/8c473e2437be8b6a8fd8f630f0f11a16b114c494",
+                "reference": "8c473e2437be8b6a8fd8f630f0f11a16b114c494",
+                "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 || ^1.0.0",
+                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0 || ^4.0",
+                "nikic/php-parser": "^4.16",
+                "php": "^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0",
+                "sebastian/diff": "^4.0 || ^5.0",
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+                "symfony/filesystem": "^5.4 || ^6.0 || ^7.0"
+            },
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+            },
+            "provide": {
+                "psalm/psalm": "self.version"
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+            "require-dev": {
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+                "bamarni/composer-bin-plugin": "^1.4",
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+                "mockery/mockery": "^1.5",
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+                "php-parallel-lint/php-parallel-lint": "^1.2",
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+                "psalm/plugin-mockery": "^1.1",
+                "psalm/plugin-phpunit": "^0.18",
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+                "symfony/process": "^4.4 || ^5.0 || ^6.0 || ^7.0"
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+                "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",
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+                "psalter"
+            ],
+            "type": "project",
+            "extra": {
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+                    "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": {
+                "docs": "https://psalm.dev/docs",
+                "issues": "https://github.com/vimeo/psalm/issues",
+                "source": "https://github.com/vimeo/psalm"
+            },
+            "time": "2024-02-01T01:04:32+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"
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     ],
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diff --git a/psalm-baseline.xml b/psalm-baseline.xml
new file mode 100644
index 0000000000..13cad7ad67
--- /dev/null
+++ b/psalm-baseline.xml
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<files psalm-version="5.21.1@8c473e2437be8b6a8fd8f630f0f11a16b114c494"/>
diff --git a/psalm.xml b/psalm.xml
new file mode 100644
index 0000000000..a9d9cb3d21
--- /dev/null
+++ b/psalm.xml
@@ -0,0 +1,22 @@
+<?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="false"
+  findUnusedVariablesAndParams="false"
+  resolveFromConfigFile="true"
+  strictBinaryOperands="true"
+>
+  <projectFiles>
+    <directory name="src"/>
+    <directory name="tests"/>
+    <ignoreFiles>
+      <file name="tests/run-tests.php"/>
+    </ignoreFiles>
+  </projectFiles>
+</psalm>