psalm.xml

<?xml version="1.0"?>
<psalm errorLevel="1"
    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>
            <file name="src/Application.php" />
            <file name="src/Config.php" />
            <file name="src/Container.php" />
            <file name="src/Emailer.php" />
            <file name="src/EmailRecipient.php" />
            <file name="src/settings_inc.php" />
            <file name="src/SmtpCredentials.php" />
            <file name="src/UrlListBuilder.php" />
            <file name="src/UrlTester.php" />
            <file name="src/utility_inc.php" />

            <directory name="vendor" />
            <directory name="tests" />
        </ignoreFiles>
    </projectFiles>
</psalm>