Add Psalm

composer.json

@@ -25,7 +25,9 @@
         "laravel/dusk": "~5.0",
         "mockery/mockery": "^1.1",
         "orchestra/testbench": "^5.0",
-        "phpunit/phpunit": "9.*"
+        "phpunit/phpunit": "9.*",
+        "psalm/plugin-laravel": "^1.3",
+        "vimeo/psalm": "^3.12"
     },
     "autoload": {
         "psr-4": {
@@ -39,6 +41,7 @@
         }
     },
     "scripts": {
+        "psalm": "vendor/bin/psalm",
         "test": "vendor/bin/phpunit"
     },
     "config": {

psalm.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0"?>
+<psalm
+    errorLevel="4"
+    findUnusedVariablesAndParams="true"
+    resolveFromConfigFile="true"
+    useDocblockPropertyTypes="true"
+    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"
+>
+    <projectFiles>
+        <directory name="src"/>
+         <ignoreFiles>
+            <directory name="vendor" />
+        </ignoreFiles>
+    </projectFiles>
+
+    <issueHandlers>
+    </issueHandlers>
+
+    <plugins>
+        <pluginClass class="Psalm\LaravelPlugin\Plugin"/>
+    </plugins>
+</psalm>