psalm.xml

<?xml version="1.0"?>
<psalm
    errorLevel="8"
    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>

    <issueHandlers>
        <!-- Psalm does not understand classes/interfaces defined inside if (false) {} -->
        <!-- https://github.com/vimeo/psalm/issues/5750 -->
        <UnrecognizedStatement>
            <errorLevel type="suppress">
                <file name="src/Behat/Behat/HelperContainer/ContainerInterface.php" />
                <file name="src/Behat/Behat/HelperContainer/Exception/ContainerException.php" />
                <file name="src/Behat/Behat/HelperContainer/Exception/NotFoundException.php" />
            </errorLevel>
        </UnrecognizedStatement>

        <!-- Suppress errors due to PSR exceptions not implementing Throwable -->
        <!-- https://github.com/vimeo/psalm/issues/1856 -->
        <InvalidThrow>
            <errorLevel type="suppress">
                <referencedClass name="Psr\Container\ContainerExceptionInterface" />
            </errorLevel>
        </InvalidThrow>

        <!-- Suppress errors related to legacy PHPUnit classes -->
        <UndefinedClass>
            <errorLevel type="suppress">
                <referencedClass name="PHPUnit_Framework_Exception" />
                <referencedClass name="PHPUnit_Framework_TestFailure" />
            </errorLevel>
        </UndefinedClass>
    </issueHandlers>
</psalm>