Configure Psalm

.gitattributes

@@ -8,4 +8,5 @@
 /docs               export-ignore
 /test               export-ignore
 /phpunit.xml.dist   export-ignore
+/psalm.xnk          export-ignore
 /public             export-ignore

composer.json

@@ -19,7 +19,8 @@
     },
     "require-dev": {
         "phpspec/prophecy-phpunit": "^2.0",
-        "phpunit/phpunit": "^9"
+        "phpunit/phpunit": "^9",
+        "vimeo/psalm": "^3.4"
     },
     "autoload": {
         "psr-4": {

docker/php/Dockerfile

@@ -32,8 +32,9 @@ COPY ./test /usr/local/src/wellrested/test
 COPY ./composer.* /usr/local/src/wellrested/
 COPY ./phpunit.xml.dist /usr/local/src/wellrested/
 
-# Add symlink for phpunit for easier running
+# Add symlinks for phpunit and psalm for easier running
 RUN ln -s /usr/local/src/wellrested/vendor/bin/phpunit /usr/local/bin/phpunit
+RUN ln -s /usr/local/src/wellrested/vendor/bin/psalm /usr/local/bin/psalm
 
 WORKDIR /usr/local/src/wellrested
 

psalm.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<psalm
+    errorLevel="4"
+    resolveFromConfigFile="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>
+</psalm>