psalm.xml

<?xml version="1.0"?>
<psalm
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        errorLevel="7"
        resolveFromConfigFile="true"
        xmlns="https://getpsalm.org/schema/config"
        xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
        errorBaseline="psalm-baseline.xml"
>
    <projectFiles>
        <directory name="src"/>
        <ignoreFiles>
            <directory name="vendor"/>
            <file name="src/lib/Actors/.phpstorm.meta.php"/>
            <file name="src/lib/Deserialization/.phpstorm.meta.php"/>
        </ignoreFiles>
    </projectFiles>
    <issueHandlers>
        <UndefinedAttributeClass>
            <errorLevel type="suppress">
                <directory name="src"/>
                <directory name="tests"/>
            </errorLevel>
        </UndefinedAttributeClass>
    </issueHandlers>
</psalm>