psalm.xml

<?xml version="1.0"?>
<psalm
    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"
    errorLevel="5"
    findUnusedVariablesAndParams="true"
>
    <projectFiles>
        <directory name="src" />
        <directory name="incubator/guides/src" />
        <ignoreFiles>
            <directory name="vendor" />
        </ignoreFiles>
    </projectFiles>

    <issueHandlers>
        <!-- User Defined -->
        <UndefinedMagicMethod>
            <errorLevel type="suppress">
                <!-- Magic Methods on GraphViz -->
                <referencedMethod name="phpDocumentor\GraphViz\Graph::setlabel"/>
                <referencedMethod name="phpDocumentor\GraphViz\Node::setshape"/>
                <referencedMethod name="phpDocumentor\GraphViz\Node::setfontcolor"/>
                <!-- not sure what's going on here -->
                <referencedMethod name="League\Flysystem\Filesystem::find"/>
            </errorLevel>
        </UndefinedMagicMethod>

        <UnusedVariable>
            <errorLevel type="suppress">
                <file name="src/phpDocumentor/Transformer/Writer/Twig/Extension.php" />
            </errorLevel>
        </UnusedVariable>

        <UndefinedInterfaceMethod>
            <errorLevel type="suppress">
                <!-- not sure what's going on here -->
                <referencedMethod name="League\Flysystem\FilesystemInterface::find"/>
            </errorLevel>
        </UndefinedInterfaceMethod>

        <InvalidArgument>
            <errorLevel type="suppress">
                <!-- To be valid, we'd have to make Collection @template-covariant and make it immutable. Lot of work for small gain-->
                <referencedFunction name="phpDocumentor\Descriptor\Collection::merge"/>
                <referencedFunction name="phpDocumentor\Descriptor\Collection::add"/>
                <referencedFunction name="phpDocumentor\Descriptor\Collection::set"/>
                <!-- Either current() works on something else than an array and Psalm is wrong or this methods *can* return an object,
                but just happen not to in this specific call -->
                <referencedFunction name="current"/>
                <!-- psalm bug -->
                <referencedFunction name="phpDocumentor\Descriptor\Builder\AssemblerFactory::register" />
                <referencedFunction name="phpDocumentor\Descriptor\Builder\AssemblerFactory::registerFallback" />
                <!-- requires config design improvements -->
                <referencedFunction name="phpDocumentor\Transformer\Template\Factory::getTemplates" />
            </errorLevel>
        </InvalidArgument>

        <!-- Unnecessary @var annotations are mainly for PHPStorm when it can't read Generics.
        This could be removed when https://youtrack.jetbrains.com/issue/WI-47158 will be resolved
        or if we decide PHPStorm autocompletion is not needed -->
        <UnnecessaryVarAnnotation errorLevel="suppress" />

        <InvalidThrow>
            <errorLevel type="suppress">
                <!-- An interface of exception that does not implements Throwable -->
                <referencedClass name="Psr\Cache\InvalidArgumentException"/>
            </errorLevel>
        </InvalidThrow>

        <TooManyTemplateParams>
            <errorLevel type="suppress">
                <file name="src/phpDocumentor/Compiler/Compiler.php"/>
            </errorLevel>
        </TooManyTemplateParams>

        <DeprecatedClass>
            <errorLevel type="suppress">
                <!-- MountManager will be removed in Flysystem V2 -->
                <referencedClass name="League\Flysystem\MountManager"/>
                <referencedClass name="PackageVersions\Versions"/>
                <referencedClass name="Symfony\Component\Routing\RouteCollectionBuilder"/>
                <!-- No alternative _yet_; refactor these references away when possible -->
                <referencedClass name="phpDocumentor\Guides\Nodes\TemplatedNode"/>
            </errorLevel>
        </DeprecatedClass>

        <InvalidReturnStatement>
            <errorLevel type="suppress">
                <!-- Discussed here #2271-->
                <file name="src/phpDocumentor/Descriptor/ClassDescriptor.php"/>
                <file name="src/phpDocumentor/Descriptor/PropertyDescriptor.php"/>
                <!-- Linker & LinkRenderer works with a lot of types and transform each of them individually. They'll have to be refactored -->
                <file name="src/phpDocumentor/Transformer/Writer/Twig/LinkRenderer.php"/>
                <file name="src/phpDocumentor/Compiler/Linker/Linker.php"/>
            </errorLevel>
        </InvalidReturnStatement>

        <InvalidReturnType>
            <errorLevel type="suppress">
                <!-- Discussed here #2271-->
                <file name="src/phpDocumentor/Descriptor/PropertyDescriptor.php"/>
                <!-- Linker & LinkRenderer works with a lot of types and transform each of them individually. They'll have to be refactored -->
                <file name="src/phpDocumentor/Transformer/Writer/Twig/LinkRenderer.php"/>
                <file name="src/phpDocumentor/Compiler/Linker/Linker.php"/>
            </errorLevel>
        </InvalidReturnType>
        
        <UnusedMethodCall>
            <errorLevel type="suppress">
                <!-- Psalm think the call is unused. Don't know why -->
                <referencedMethod name="Webmozart\Assert\Mixin::nullOrIsInstanceOf"/>
            </errorLevel>
        </UnusedMethodCall>

        <MoreSpecificImplementedParamType>
            <errorLevel type="suppress">
                <!-- Missing documentation in phpDocumentor\Reflection library. Fixed in phpDocumentor/Reflection/pull/181. This can be removed starting from ^4.0.2 -->
                <directory name="src/phpDocumentor/Parser/Middleware/"/>
                <directory name="src/phpDocumentor/Descriptor/Builder/Reflector/"/>
                <file name="src/phpDocumentor/Configuration/Definition/Version2.php"/>
                <file name="src/phpDocumentor/Configuration/Definition/Version3.php"/>
            </errorLevel>
        </MoreSpecificImplementedParamType>

        <InvalidCast>
            <errorLevel type="suppress">
                <file name="src/phpDocumentor/Descriptor/Builder/Reflector/Tags/InvalidTagAssembler.php" />
            </errorLevel>
        </InvalidCast>
    </issueHandlers>
</psalm>