diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
new file mode 100644
index 0000000..d50d84d
--- /dev/null
+++ b/.github/workflows/backend.yml
@@ -0,0 +1,12 @@
+name: FoF OAuth PHP
+
+on: [workflow_dispatch, push, pull_request]
+
+jobs:
+  run:
+    uses: flarum/framework/.github/workflows/REUSABLE_backend.yml@main
+    with:
+      enable_backend_testing: false
+      enable_phpstan: true
+
+      backend_directory: .
diff --git a/.github/workflows/build.yml b/.github/workflows/frontend.yml
similarity index 89%
rename from .github/workflows/build.yml
rename to .github/workflows/frontend.yml
index ca3526b..549c078 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/frontend.yml
@@ -1,4 +1,4 @@
-name: Javascript
+name: FoF OAuth JS
 
 on: [workflow_dispatch, push, pull_request]
 
@@ -8,11 +8,12 @@ jobs:
     with:
       enable_bundlewatch: false
       enable_prettier: true
-      enable_typescript: false
+      enable_typescript: true
 
       frontend_directory: ./js
       backend_directory: .
       js_package_manager: npm
       main_git_branch: master
+
     secrets:
       bundlewatch_github_token: ${{ secrets.BUNDLEWATCH_GITHUB_TOKEN }}
diff --git a/composer.json b/composer.json
index 2df03bb..effe2c3 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
         "league/oauth2-facebook": "^2.2.0",
         "league/oauth2-github": "^3.1.0",
         "league/oauth2-google": "^4.0.1",
-        "omines/oauth2-gitlab": "^3.5.0",
+        "omines/oauth2-gitlab": "^3.3.0",
         "wohali/oauth2-discord-new": "^1.2.1",
         "league/oauth2-linkedin": "^5.1.2",
         "fof/extend": "^1.2.1"
@@ -76,6 +76,21 @@
         },
         "flagrow": {
             "discuss": "https://discuss.flarum.org/d/25182"
+        },
+        "flarum-cli": {
+            "modules": {
+                "githubActions": true
+            }
         }
+    },
+    "require-dev": {
+        "flarum/phpstan": "*"
+    },
+    "scripts": {
+        "analyse:phpstan": "phpstan analyse",
+        "clear-cache:phpstan": "phpstan clear-result-cache"
+    },
+    "scripts-descriptions": {
+        "analyse:phpstan": "Run static analysis"
     }
 }
diff --git a/extend.php b/extend.php
index 46191ad..dde8517 100644
--- a/extend.php
+++ b/extend.php
@@ -73,7 +73,10 @@
     (new Extend\ApiSerializer(CurrentUserSerializer::class))
         ->attributes(function (CurrentUserSerializer $serializer, User $user, array $attributes) {
             $session = $serializer->getRequest()->getAttribute('session');
-            $attributes['loginProvider'] = $session?->get(AbstractOAuthController::SESSION_OAUTH2PROVIDER);
+
+            if ($session) {
+                $attributes['loginProvider'] = $session->get(AbstractOAuthController::SESSION_OAUTH2PROVIDER);
+            }
 
             return $attributes;
         }),
diff --git a/js/package-lock.json b/js/package-lock.json
index 9137e66..e031d87 100644
--- a/js/package-lock.json
+++ b/js/package-lock.json
@@ -15,15 +15,16 @@
         "webpack-cli": "^5.1.4"
       },
       "devDependencies": {
-        "prettier": "^2.8.8"
+        "prettier": "^3.0.3"
       }
     },
     "node_modules/@babel/code-frame": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.16.7.tgz",
-      "integrity": "sha512-iAXqUn8IIeBTNd72xsFlgaXHkMBMt6y4HJp1tIaK465CWLT/fG1aqB7ykr95gHHmlBdGbFeWWfyB4NJJ0nmeIg==",
+      "version": "7.22.13",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.22.13.tgz",
+      "integrity": "sha512-XktuhWlJ5g+3TJXc5upd9Ks1HutSArik6jf2eAjYFyIOf4ej3RN+184cZbzDvbPnuTJIUhPKKJE3cIsYTiAT3w==",
       "dependencies": {
-        "@babel/highlight": "^7.16.7"
+        "@babel/highlight": "^7.22.13",
+        "chalk": "^2.4.2"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -67,13 +68,14 @@
       }
     },
     "node_modules/@babel/generator": {
-      "version": "7.16.8",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.16.8.tgz",
-      "integrity": "sha512-1ojZwE9+lOXzcWdWmO6TbUzDfqLD39CmEhN8+2cX9XkDo5yW1OpgfejfliysR2AWLpMamTiOiAp/mtroaymhpw==",
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.23.3.tgz",
+      "integrity": "sha512-keeZWAV4LU3tW0qRi19HRpabC/ilM0HRBBzf9/k8FFiG4KVpiv0FIy4hHfLfFQZNhziCTPTmd59zoyv6DNISzg==",
       "dependencies": {
-        "@babel/types": "^7.16.8",
-        "jsesc": "^2.5.1",
-        "source-map": "^0.5.0"
+        "@babel/types": "^7.23.3",
+        "@jridgewell/gen-mapping": "^0.3.2",
+        "@jridgewell/trace-mapping": "^0.3.17",
+        "jsesc": "^2.5.1"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -173,12 +175,9 @@
       }
     },
     "node_modules/@babel/helper-environment-visitor": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-environment-visitor/-/helper-environment-visitor-7.16.7.tgz",
-      "integrity": "sha512-SLLb0AAn6PkUeAfKJCCOl9e1R53pQlGAfc4y4XuMRZfqeMYLE0dM1LMhqbGAlGQY0lfw5/ohoYWAe9V1yibRag==",
-      "dependencies": {
-        "@babel/types": "^7.16.7"
-      },
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/helper-environment-visitor/-/helper-environment-visitor-7.22.20.tgz",
+      "integrity": "sha512-zfedSIzFhat/gFhWfHtgWvlec0nqB9YEIVrpuwjruLlXfUSnA8cJB0miHKwqDnQ7d32aKo2xt88/xZptwxbfhA==",
       "engines": {
         "node": ">=6.9.0"
       }
@@ -195,35 +194,23 @@
       }
     },
     "node_modules/@babel/helper-function-name": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.16.7.tgz",
-      "integrity": "sha512-QfDfEnIUyyBSR3HtrtGECuZ6DAyCkYFp7GHl75vFtTnn6pjKeK0T1DB5lLkFvBea8MdaiUABx3osbgLyInoejA==",
-      "dependencies": {
-        "@babel/helper-get-function-arity": "^7.16.7",
-        "@babel/template": "^7.16.7",
-        "@babel/types": "^7.16.7"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/helper-get-function-arity": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.16.7.tgz",
-      "integrity": "sha512-flc+RLSOBXzNzVhcLu6ujeHUrD6tANAOU5ojrRx/as+tbzf8+stUCj7+IfRRoAbEZqj/ahXEMsjhOhgeZsrnTw==",
+      "version": "7.23.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.23.0.tgz",
+      "integrity": "sha512-OErEqsrxjZTJciZ4Oo+eoZqeW9UIiOcuYKRJA4ZAgV9myA+pOXhhmpfNCKjEH/auVfEYVFJ6y1Tc4r0eIApqiw==",
       "dependencies": {
-        "@babel/types": "^7.16.7"
+        "@babel/template": "^7.22.15",
+        "@babel/types": "^7.23.0"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
     "node_modules/@babel/helper-hoist-variables": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.16.7.tgz",
-      "integrity": "sha512-m04d/0Op34H5v7pbZw6pSKP7weA6lsMvfiIAMeIvkY/R4xQtBSMFEigu9QTZ2qB/9l22vsxtM8a+Q8CzD255fg==",
+      "version": "7.22.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.22.5.tgz",
+      "integrity": "sha512-wGjk9QZVzvknA6yKIUURb8zY3grXCcOZt+/7Wcy8O2uctxhplmUPkOdlgoNhmdVee2c92JXbf1xpMtVNbfoxRw==",
       "dependencies": {
-        "@babel/types": "^7.16.7"
+        "@babel/types": "^7.22.5"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -339,20 +326,28 @@
       }
     },
     "node_modules/@babel/helper-split-export-declaration": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.16.7.tgz",
-      "integrity": "sha512-xbWoy/PFoxSWazIToT9Sif+jJTlrMcndIsaOKvTA6u7QEo7ilkRZpjew18/W3c7nm8fXdUDXh02VXTbZ0pGDNw==",
+      "version": "7.22.6",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.22.6.tgz",
+      "integrity": "sha512-AsUnxuLhRYsisFiaJwvp1QF+I3KjD5FOxut14q/GzovUe6orHLesW2C7d754kRm53h5gqrz6sFl6sxc4BVtE/g==",
       "dependencies": {
-        "@babel/types": "^7.16.7"
+        "@babel/types": "^7.22.5"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/helper-string-parser": {
+      "version": "7.22.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.22.5.tgz",
+      "integrity": "sha512-mM4COjgZox8U+JcXQwPijIZLElkgEpO5rsERVDJTc2qfCDfERyob6k5WegS14SX18IIjv+XD+GrqNumY5JRCDw==",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.16.7.tgz",
-      "integrity": "sha512-hsEnFemeiW4D08A5gUAZxLBTXpZ39P+a+DGDsHw1yxqyQ/jzFEnxf5uTEGp+3bzAbNOxU1paTgYS4ECU/IgfDw==",
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.22.20.tgz",
+      "integrity": "sha512-Y4OZ+ytlatR8AI+8KZfKuL5urKp7qey08ha31L8b3BwewJAoJamTzyvxPR/5D+KkdJCGPq/+8TukHBlY10FX9A==",
       "engines": {
         "node": ">=6.9.0"
       }
@@ -393,12 +388,12 @@
       }
     },
     "node_modules/@babel/highlight": {
-      "version": "7.16.10",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.16.10.tgz",
-      "integrity": "sha512-5FnTQLSLswEj6IkgVw5KusNUUFY9ZGqe/TRFnP/BKYHYgfh7tc+C7mwiy95/yNP7Dh9x580Vv8r7u7ZfTBFxdw==",
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.22.20.tgz",
+      "integrity": "sha512-dkdMCN3py0+ksCgYmGG8jKeGA/8Tk+gJwSYYlFGxG5lmhfKNoAy004YpLxpS1W2J8m/EK2Ew+yOs9pVRwO89mg==",
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.16.7",
-        "chalk": "^2.0.0",
+        "@babel/helper-validator-identifier": "^7.22.20",
+        "chalk": "^2.4.2",
         "js-tokens": "^4.0.0"
       },
       "engines": {
@@ -406,9 +401,9 @@
       }
     },
     "node_modules/@babel/parser": {
-      "version": "7.16.12",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.16.12.tgz",
-      "integrity": "sha512-VfaV15po8RiZssrkPweyvbGVSe4x2y+aciFCgn0n0/SJMR22cwofRV1mtnJQYcSB1wUTaA/X1LnA3es66MCO5A==",
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.23.3.tgz",
+      "integrity": "sha512-uVsWNvlVsIninV2prNz/3lHCb+5CJ+e+IUBfbjToAHODtfGYLfCFuY4AU7TskI+dAKk+njsPiBjq1gKTvZOBaw==",
       "bin": {
         "parser": "bin/babel-parser.js"
       },
@@ -1603,31 +1598,31 @@
       }
     },
     "node_modules/@babel/template": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.16.7.tgz",
-      "integrity": "sha512-I8j/x8kHUrbYRTUxXrrMbfCa7jxkE7tZre39x3kjr9hvI82cK1FfqLygotcWN5kdPGWcLdWMHpSBavse5tWw3w==",
+      "version": "7.22.15",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.22.15.tgz",
+      "integrity": "sha512-QPErUVm4uyJa60rkI73qneDacvdvzxshT3kksGqlGWYdOTIUOwJ7RDUL8sGqslY1uXWSL6xMFKEXDS3ox2uF0w==",
       "dependencies": {
-        "@babel/code-frame": "^7.16.7",
-        "@babel/parser": "^7.16.7",
-        "@babel/types": "^7.16.7"
+        "@babel/code-frame": "^7.22.13",
+        "@babel/parser": "^7.22.15",
+        "@babel/types": "^7.22.15"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
     "node_modules/@babel/traverse": {
-      "version": "7.16.10",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.16.10.tgz",
-      "integrity": "sha512-yzuaYXoRJBGMlBhsMJoUW7G1UmSb/eXr/JHYM/MsOJgavJibLwASijW7oXBdw3NQ6T0bW7Ty5P/VarOs9cHmqw==",
-      "dependencies": {
-        "@babel/code-frame": "^7.16.7",
-        "@babel/generator": "^7.16.8",
-        "@babel/helper-environment-visitor": "^7.16.7",
-        "@babel/helper-function-name": "^7.16.7",
-        "@babel/helper-hoist-variables": "^7.16.7",
-        "@babel/helper-split-export-declaration": "^7.16.7",
-        "@babel/parser": "^7.16.10",
-        "@babel/types": "^7.16.8",
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.23.3.tgz",
+      "integrity": "sha512-+K0yF1/9yR0oHdE0StHuEj3uTPzwwbrLGfNOndVJVV2TqA5+j3oljJUb4nmB954FLGjNem976+B+eDuLIjesiQ==",
+      "dependencies": {
+        "@babel/code-frame": "^7.22.13",
+        "@babel/generator": "^7.23.3",
+        "@babel/helper-environment-visitor": "^7.22.20",
+        "@babel/helper-function-name": "^7.23.0",
+        "@babel/helper-hoist-variables": "^7.22.5",
+        "@babel/helper-split-export-declaration": "^7.22.6",
+        "@babel/parser": "^7.23.3",
+        "@babel/types": "^7.23.3",
         "debug": "^4.1.0",
         "globals": "^11.1.0"
       },
@@ -1636,11 +1631,12 @@
       }
     },
     "node_modules/@babel/types": {
-      "version": "7.16.8",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.16.8.tgz",
-      "integrity": "sha512-smN2DQc5s4M7fntyjGtyIPbRJv6wW4rU/94fmYJ7PKQuZkC0qGMHXJbg6sNGt12JmVr4k5YaptI/XtiLJBnmIg==",
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.23.3.tgz",
+      "integrity": "sha512-OZnvoH2l8PK5eUvEcUyCt/sXgr/h+UWpVuBbOljwcrAgUl6lpchoQ++PHGyQy1AtYnVA6CEq3y5xeEI10brpXw==",
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.16.7",
+        "@babel/helper-string-parser": "^7.22.5",
+        "@babel/helper-validator-identifier": "^7.22.20",
         "to-fast-properties": "^2.0.0"
       },
       "engines": {
@@ -2198,7 +2194,7 @@
     "node_modules/color-name": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
+      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw=="
     },
     "node_modules/colorette": {
       "version": "2.0.16",
@@ -2337,7 +2333,7 @@
     "node_modules/escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
+      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
       "engines": {
         "node": ">=0.8.0"
       }
@@ -2546,7 +2542,7 @@
     "node_modules/has-flag": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
-      "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+      "integrity": "sha512-sKJf1+ceQBr4SMkvQnBDNDtf4TXpVhVGateu0t918bl30FnbE2m4vNLX+VWe/dpjlb+HugGYzW7uQXH98HPEYw==",
       "engines": {
         "node": ">=4"
       }
@@ -2926,15 +2922,15 @@
       }
     },
     "node_modules/prettier": {
-      "version": "2.8.8",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
-      "integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.0.3.tgz",
+      "integrity": "sha512-L/4pUDMxcNa8R/EthV08Zt42WBO4h1rarVtK0K+QJG0X187OLo7l699jWw0GKuwzkPQ//jMFA/8Xm6Fh3J/DAg==",
       "dev": true,
       "bin": {
-        "prettier": "bin-prettier.js"
+        "prettier": "bin/prettier.cjs"
       },
       "engines": {
-        "node": ">=10.13.0"
+        "node": ">=14"
       },
       "funding": {
         "url": "https://github.com/prettier/prettier?sponsor=1"
@@ -3643,11 +3639,12 @@
   },
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.16.7.tgz",
-      "integrity": "sha512-iAXqUn8IIeBTNd72xsFlgaXHkMBMt6y4HJp1tIaK465CWLT/fG1aqB7ykr95gHHmlBdGbFeWWfyB4NJJ0nmeIg==",
+      "version": "7.22.13",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.22.13.tgz",
+      "integrity": "sha512-XktuhWlJ5g+3TJXc5upd9Ks1HutSArik6jf2eAjYFyIOf4ej3RN+184cZbzDvbPnuTJIUhPKKJE3cIsYTiAT3w==",
       "requires": {
-        "@babel/highlight": "^7.16.7"
+        "@babel/highlight": "^7.22.13",
+        "chalk": "^2.4.2"
       }
     },
     "@babel/compat-data": {
@@ -3678,13 +3675,14 @@
       }
     },
     "@babel/generator": {
-      "version": "7.16.8",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.16.8.tgz",
-      "integrity": "sha512-1ojZwE9+lOXzcWdWmO6TbUzDfqLD39CmEhN8+2cX9XkDo5yW1OpgfejfliysR2AWLpMamTiOiAp/mtroaymhpw==",
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.23.3.tgz",
+      "integrity": "sha512-keeZWAV4LU3tW0qRi19HRpabC/ilM0HRBBzf9/k8FFiG4KVpiv0FIy4hHfLfFQZNhziCTPTmd59zoyv6DNISzg==",
       "requires": {
-        "@babel/types": "^7.16.8",
-        "jsesc": "^2.5.1",
-        "source-map": "^0.5.0"
+        "@babel/types": "^7.23.3",
+        "@jridgewell/gen-mapping": "^0.3.2",
+        "@jridgewell/trace-mapping": "^0.3.17",
+        "jsesc": "^2.5.1"
       }
     },
     "@babel/helper-annotate-as-pure": {
@@ -3754,12 +3752,9 @@
       }
     },
     "@babel/helper-environment-visitor": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-environment-visitor/-/helper-environment-visitor-7.16.7.tgz",
-      "integrity": "sha512-SLLb0AAn6PkUeAfKJCCOl9e1R53pQlGAfc4y4XuMRZfqeMYLE0dM1LMhqbGAlGQY0lfw5/ohoYWAe9V1yibRag==",
-      "requires": {
-        "@babel/types": "^7.16.7"
-      }
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/helper-environment-visitor/-/helper-environment-visitor-7.22.20.tgz",
+      "integrity": "sha512-zfedSIzFhat/gFhWfHtgWvlec0nqB9YEIVrpuwjruLlXfUSnA8cJB0miHKwqDnQ7d32aKo2xt88/xZptwxbfhA=="
     },
     "@babel/helper-explode-assignable-expression": {
       "version": "7.16.7",
@@ -3770,29 +3765,20 @@
       }
     },
     "@babel/helper-function-name": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.16.7.tgz",
-      "integrity": "sha512-QfDfEnIUyyBSR3HtrtGECuZ6DAyCkYFp7GHl75vFtTnn6pjKeK0T1DB5lLkFvBea8MdaiUABx3osbgLyInoejA==",
+      "version": "7.23.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.23.0.tgz",
+      "integrity": "sha512-OErEqsrxjZTJciZ4Oo+eoZqeW9UIiOcuYKRJA4ZAgV9myA+pOXhhmpfNCKjEH/auVfEYVFJ6y1Tc4r0eIApqiw==",
       "requires": {
-        "@babel/helper-get-function-arity": "^7.16.7",
-        "@babel/template": "^7.16.7",
-        "@babel/types": "^7.16.7"
-      }
-    },
-    "@babel/helper-get-function-arity": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.16.7.tgz",
-      "integrity": "sha512-flc+RLSOBXzNzVhcLu6ujeHUrD6tANAOU5ojrRx/as+tbzf8+stUCj7+IfRRoAbEZqj/ahXEMsjhOhgeZsrnTw==",
-      "requires": {
-        "@babel/types": "^7.16.7"
+        "@babel/template": "^7.22.15",
+        "@babel/types": "^7.23.0"
       }
     },
     "@babel/helper-hoist-variables": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.16.7.tgz",
-      "integrity": "sha512-m04d/0Op34H5v7pbZw6pSKP7weA6lsMvfiIAMeIvkY/R4xQtBSMFEigu9QTZ2qB/9l22vsxtM8a+Q8CzD255fg==",
+      "version": "7.22.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.22.5.tgz",
+      "integrity": "sha512-wGjk9QZVzvknA6yKIUURb8zY3grXCcOZt+/7Wcy8O2uctxhplmUPkOdlgoNhmdVee2c92JXbf1xpMtVNbfoxRw==",
       "requires": {
-        "@babel/types": "^7.16.7"
+        "@babel/types": "^7.22.5"
       }
     },
     "@babel/helper-member-expression-to-functions": {
@@ -3878,17 +3864,22 @@
       }
     },
     "@babel/helper-split-export-declaration": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.16.7.tgz",
-      "integrity": "sha512-xbWoy/PFoxSWazIToT9Sif+jJTlrMcndIsaOKvTA6u7QEo7ilkRZpjew18/W3c7nm8fXdUDXh02VXTbZ0pGDNw==",
+      "version": "7.22.6",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.22.6.tgz",
+      "integrity": "sha512-AsUnxuLhRYsisFiaJwvp1QF+I3KjD5FOxut14q/GzovUe6orHLesW2C7d754kRm53h5gqrz6sFl6sxc4BVtE/g==",
       "requires": {
-        "@babel/types": "^7.16.7"
+        "@babel/types": "^7.22.5"
       }
     },
+    "@babel/helper-string-parser": {
+      "version": "7.22.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.22.5.tgz",
+      "integrity": "sha512-mM4COjgZox8U+JcXQwPijIZLElkgEpO5rsERVDJTc2qfCDfERyob6k5WegS14SX18IIjv+XD+GrqNumY5JRCDw=="
+    },
     "@babel/helper-validator-identifier": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.16.7.tgz",
-      "integrity": "sha512-hsEnFemeiW4D08A5gUAZxLBTXpZ39P+a+DGDsHw1yxqyQ/jzFEnxf5uTEGp+3bzAbNOxU1paTgYS4ECU/IgfDw=="
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.22.20.tgz",
+      "integrity": "sha512-Y4OZ+ytlatR8AI+8KZfKuL5urKp7qey08ha31L8b3BwewJAoJamTzyvxPR/5D+KkdJCGPq/+8TukHBlY10FX9A=="
     },
     "@babel/helper-validator-option": {
       "version": "7.16.7",
@@ -3917,19 +3908,19 @@
       }
     },
     "@babel/highlight": {
-      "version": "7.16.10",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.16.10.tgz",
-      "integrity": "sha512-5FnTQLSLswEj6IkgVw5KusNUUFY9ZGqe/TRFnP/BKYHYgfh7tc+C7mwiy95/yNP7Dh9x580Vv8r7u7ZfTBFxdw==",
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.22.20.tgz",
+      "integrity": "sha512-dkdMCN3py0+ksCgYmGG8jKeGA/8Tk+gJwSYYlFGxG5lmhfKNoAy004YpLxpS1W2J8m/EK2Ew+yOs9pVRwO89mg==",
       "requires": {
-        "@babel/helper-validator-identifier": "^7.16.7",
-        "chalk": "^2.0.0",
+        "@babel/helper-validator-identifier": "^7.22.20",
+        "chalk": "^2.4.2",
         "js-tokens": "^4.0.0"
       }
     },
     "@babel/parser": {
-      "version": "7.16.12",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.16.12.tgz",
-      "integrity": "sha512-VfaV15po8RiZssrkPweyvbGVSe4x2y+aciFCgn0n0/SJMR22cwofRV1mtnJQYcSB1wUTaA/X1LnA3es66MCO5A=="
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.23.3.tgz",
+      "integrity": "sha512-uVsWNvlVsIninV2prNz/3lHCb+5CJ+e+IUBfbjToAHODtfGYLfCFuY4AU7TskI+dAKk+njsPiBjq1gKTvZOBaw=="
     },
     "@babel/plugin-bugfix-safari-id-destructuring-collision-in-function-expression": {
       "version": "7.16.7",
@@ -4695,38 +4686,39 @@
       }
     },
     "@babel/template": {
-      "version": "7.16.7",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.16.7.tgz",
-      "integrity": "sha512-I8j/x8kHUrbYRTUxXrrMbfCa7jxkE7tZre39x3kjr9hvI82cK1FfqLygotcWN5kdPGWcLdWMHpSBavse5tWw3w==",
+      "version": "7.22.15",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.22.15.tgz",
+      "integrity": "sha512-QPErUVm4uyJa60rkI73qneDacvdvzxshT3kksGqlGWYdOTIUOwJ7RDUL8sGqslY1uXWSL6xMFKEXDS3ox2uF0w==",
       "requires": {
-        "@babel/code-frame": "^7.16.7",
-        "@babel/parser": "^7.16.7",
-        "@babel/types": "^7.16.7"
+        "@babel/code-frame": "^7.22.13",
+        "@babel/parser": "^7.22.15",
+        "@babel/types": "^7.22.15"
       }
     },
     "@babel/traverse": {
-      "version": "7.16.10",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.16.10.tgz",
-      "integrity": "sha512-yzuaYXoRJBGMlBhsMJoUW7G1UmSb/eXr/JHYM/MsOJgavJibLwASijW7oXBdw3NQ6T0bW7Ty5P/VarOs9cHmqw==",
-      "requires": {
-        "@babel/code-frame": "^7.16.7",
-        "@babel/generator": "^7.16.8",
-        "@babel/helper-environment-visitor": "^7.16.7",
-        "@babel/helper-function-name": "^7.16.7",
-        "@babel/helper-hoist-variables": "^7.16.7",
-        "@babel/helper-split-export-declaration": "^7.16.7",
-        "@babel/parser": "^7.16.10",
-        "@babel/types": "^7.16.8",
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.23.3.tgz",
+      "integrity": "sha512-+K0yF1/9yR0oHdE0StHuEj3uTPzwwbrLGfNOndVJVV2TqA5+j3oljJUb4nmB954FLGjNem976+B+eDuLIjesiQ==",
+      "requires": {
+        "@babel/code-frame": "^7.22.13",
+        "@babel/generator": "^7.23.3",
+        "@babel/helper-environment-visitor": "^7.22.20",
+        "@babel/helper-function-name": "^7.23.0",
+        "@babel/helper-hoist-variables": "^7.22.5",
+        "@babel/helper-split-export-declaration": "^7.22.6",
+        "@babel/parser": "^7.23.3",
+        "@babel/types": "^7.23.3",
         "debug": "^4.1.0",
         "globals": "^11.1.0"
       }
     },
     "@babel/types": {
-      "version": "7.16.8",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.16.8.tgz",
-      "integrity": "sha512-smN2DQc5s4M7fntyjGtyIPbRJv6wW4rU/94fmYJ7PKQuZkC0qGMHXJbg6sNGt12JmVr4k5YaptI/XtiLJBnmIg==",
+      "version": "7.23.3",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.23.3.tgz",
+      "integrity": "sha512-OZnvoH2l8PK5eUvEcUyCt/sXgr/h+UWpVuBbOljwcrAgUl6lpchoQ++PHGyQy1AtYnVA6CEq3y5xeEI10brpXw==",
       "requires": {
-        "@babel/helper-validator-identifier": "^7.16.7",
+        "@babel/helper-string-parser": "^7.22.5",
+        "@babel/helper-validator-identifier": "^7.22.20",
         "to-fast-properties": "^2.0.0"
       }
     },
@@ -5161,7 +5153,7 @@
     "color-name": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
+      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw=="
     },
     "colorette": {
       "version": "2.0.16",
@@ -5267,7 +5259,7 @@
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
+      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg=="
     },
     "eslint-scope": {
       "version": "5.1.1",
@@ -5427,7 +5419,7 @@
     "has-flag": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
-      "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="
+      "integrity": "sha512-sKJf1+ceQBr4SMkvQnBDNDtf4TXpVhVGateu0t918bl30FnbE2m4vNLX+VWe/dpjlb+HugGYzW7uQXH98HPEYw=="
     },
     "has-symbols": {
       "version": "1.0.2",
@@ -5694,9 +5686,9 @@
       }
     },
     "prettier": {
-      "version": "2.8.8",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
-      "integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.0.3.tgz",
+      "integrity": "sha512-L/4pUDMxcNa8R/EthV08Zt42WBO4h1rarVtK0K+QJG0X187OLo7l699jWw0GKuwzkPQ//jMFA/8Xm6Fh3J/DAg==",
       "dev": true
     },
     "punycode": {
diff --git a/js/package.json b/js/package.json
index df51048..14d33cf 100644
--- a/js/package.json
+++ b/js/package.json
@@ -17,6 +17,6 @@
     "format-check": "prettier --check src"
   },
   "devDependencies": {
-    "prettier": "^2.8.8"
+    "prettier": "^3.0.3"
   }
 }
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..03cf261
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,13 @@
+includes:
+  - vendor/flarum/phpstan/extension.neon
+
+parameters:
+  # The level will be increased in Flarum 2.0
+  level: 5
+  paths:
+    - extend.php
+    - src
+  excludePaths:
+    - *.blade.php
+  checkMissingIterableValueType: false
+  databaseMigrationsPath: ['migrations']
diff --git a/src/Api/Serializers/ProviderSerializer.php b/src/Api/Serializers/ProviderSerializer.php
index d8e8ce2..eb26028 100644
--- a/src/Api/Serializers/ProviderSerializer.php
+++ b/src/Api/Serializers/ProviderSerializer.php
@@ -20,6 +20,11 @@ class ProviderSerializer extends AbstractSerializer
      */
     protected $type = 'linked-accounts';
 
+    /**
+     * @param \FoF\OAuth\LoginProviderStatus $provider
+     *
+     * @return array
+     */
     public function getDefaultAttributes($provider): array
     {
         return [
diff --git a/src/Controllers/AuthController.php b/src/Controllers/AuthController.php
index 3ee6785..c7ffe78 100644
--- a/src/Controllers/AuthController.php
+++ b/src/Controllers/AuthController.php
@@ -23,7 +23,7 @@
 class AuthController extends Controller
 {
     /**
-     * @var Provider
+     * @var ?Provider
      */
     protected $provider;
 
diff --git a/src/Controllers/TwitterAuthController.php b/src/Controllers/TwitterAuthController.php
index 5894ce0..a2d439a 100644
--- a/src/Controllers/TwitterAuthController.php
+++ b/src/Controllers/TwitterAuthController.php
@@ -138,7 +138,7 @@ protected function setSuggestions(Registration $registration, User $user)
     {
         $email = $user->email;
 
-        if (!$email || empty($email)) {
+        if (empty($email)) {
             throw new AuthenticationException('invalid_email');
         }
 
@@ -157,8 +157,8 @@ protected function getSetting($key): ?string
     /**
      * Link the currently authenticated user to the OAuth account.
      *
-     * @param FlarumUser             $user
-     * @param ResourceOwnerInterface $resourceOwner
+     * @param FlarumUser $user
+     * @param User       $resourceOwner
      *
      * @return HtmlResponse
      */
diff --git a/src/Jobs/CheckAndUpdateUserEmail.php b/src/Jobs/CheckAndUpdateUserEmail.php
index ee2e2ff..37905ad 100644
--- a/src/Jobs/CheckAndUpdateUserEmail.php
+++ b/src/Jobs/CheckAndUpdateUserEmail.php
@@ -59,14 +59,14 @@ public function handle(UserValidator $validator)
             return;
         }
 
-        /** @var User $user */
+        /** @var User|null $user */
         $user = User::find($provider->user_id);
 
-        if (!$user) {
+        if ($user === null) {
             return;
         }
 
-        if (!empty($this->providedEmail) && $user && $user->email !== $this->providedEmail) {
+        if (!empty($this->providedEmail) && $user->email !== $this->providedEmail) {
             $validator->setUser($user);
 
             $validator->assertValid([
diff --git a/src/LoginProviderStatus.php b/src/LoginProviderStatus.php
index e173a89..d9a0133 100644
--- a/src/LoginProviderStatus.php
+++ b/src/LoginProviderStatus.php
@@ -47,7 +47,7 @@ class LoginProviderStatus
     public $linked;
 
     /**
-     * @var string|null
+     * @var int
      */
     public $identifier;
 
diff --git a/src/Provider.php b/src/Provider.php
index 03cbf55..b133d0c 100644
--- a/src/Provider.php
+++ b/src/Provider.php
@@ -48,10 +48,7 @@ public function priority(): int
 
     // Controller options
 
-    public function provider(string $redirectUri): AbstractProvider
-    {
-        //
-    }
+    abstract public function provider(string $redirectUri): ?AbstractProvider;
 
     public function options(): array
     {
@@ -75,9 +72,9 @@ protected function getSetting($key): string
         return $this->settings->get("fof-oauth.{$this->name()}.{$key}");
     }
 
-    protected function verifyEmail($email)
+    protected function verifyEmail(?string $email)
     {
-        if (!$email || empty($email)) {
+        if ($email === null || empty($email)) {
             throw new AuthenticationException('invalid_email');
         }
     }
diff --git a/src/Providers/Twitter.php b/src/Providers/Twitter.php
index fd49ab2..52ae880 100644
--- a/src/Providers/Twitter.php
+++ b/src/Providers/Twitter.php
@@ -12,6 +12,7 @@
 namespace FoF\OAuth\Providers;
 
 use FoF\OAuth\Provider;
+use League\OAuth2\Client\Provider\AbstractProvider;
 
 class Twitter extends Provider
 {
@@ -37,4 +38,9 @@ public function excludeFromRoutePattern(): bool
     {
         return true;
     }
+
+    public function provider(string $redirectUri): ?AbstractProvider
+    {
+        return null;
+    }
 }