psalm.xml

<?xml version="1.0"?>
<psalm
    errorLevel="3"
    phpVersion="8.1"
    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="bundle" />
        <directory name="lib" />
        <ignoreFiles>
            <directory name="vendor" />
        </ignoreFiles>
    </projectFiles>

    <issueHandlers>
        <!-- Symfony BC layer -->

        <InvalidArgument>
            <errorLevel type="suppress">
                <referencedFunction name="Symfony\Component\EventDispatcher\EventDispatcherInterface::dispatch" />
            </errorLevel>
        </InvalidArgument>

        <UndefinedMethod>
            <errorLevel type="suppress">
                <referencedMethod name="Symfony\Component\Config\Definition\Builder\NodeDefinition::children" />
                <referencedMethod name="Symfony\Component\HttpKernel\Event\KernelEvent::isMasterRequest" />
            </errorLevel>
        </UndefinedMethod>

        <UndefinedClass>
            <errorLevel type="suppress">
                <referencedClass name="Symfony\Component\Debug\Exception\FlattenException" />
            </errorLevel>
        </UndefinedClass>

        <DuplicateClass>
            <errorLevel type="suppress">
                <file name="lib/Utils/BackwardsCompatibility/Event.php" />
            </errorLevel>
        </DuplicateClass>

        <!-- Ignore Pagerfanta integer ranges, they bring more trouble
             with trying to satisfy PHPStan than they're worth
        -->

        <MoreSpecificReturnType>
            <errorLevel type="suppress">
                <file name="lib/Pager/ItemSearchAdapter.php" />
                <file name="lib/Pager/SubItemsAdapter.php" />
            </errorLevel>
        </MoreSpecificReturnType>

        <LessSpecificReturnStatement>
            <errorLevel type="suppress">
                <file name="lib/Pager/ItemSearchAdapter.php" />
                <file name="lib/Pager/SubItemsAdapter.php" />
            </errorLevel>
        </LessSpecificReturnStatement>

        <!-- Other -->

        <InvalidPropertyFetch>
            <errorLevel type="suppress">
                <directory name="bundle/DependencyInjection" />
            </errorLevel>
        </InvalidPropertyFetch>
    </issueHandlers>
</psalm>