How to correctly returnType array of arrays?

[lowtower]

I have a method that returns an array something like this (from an zend-expressive project):

    /**
     * Returns the container dependencies
     *
     * @return string[]
     */
    public function getDependencies() : array
    {
        return [
            'invokables' => [],
            'factories' => [
                Handler\Handler::class => Handler\HandlerFactory::class,
            ],
        ];
    }

    /**
     * Returns the templates configuration
     *
     * @return string[]
     */
    public function getTemplates() : array
    {
        return [
            'paths' => [
                'test' => [__DIR__ . '/../templates/'],
            ],
        ];
    }

The returnType like above returns a phpstan error:

method getDependencies() should return array but returns array<string, array<string,string>>.
method getTemplates() should return array but returns array<string, array<string, array<int, string>>>.

How would I correctly type hint these arrays?

Thanks in advance

[lowtower]

Found the answer myself

<?php

declare(strict_types=1);

namespace Album;

/**
 * The configuration provider for the Album module
 *
 * @see https://docs.zendframework.com/zend-component-installer/
 */
class ConfigProvider
{
    /**
     * Returns the configuration array
     *
     * To add a bit of a structure, each section is defined in a separate
     * method which returns an array with its configuration.
     */
    public function __invoke() : array
    {
        return [
            'dependencies' => $this->getDependencies(),
            'templates' => $this->getTemplates(),
        ];
    }

    /**
     * Returns the container dependencies
     *
     * @return array<string, array>
     */
    private function getDependencies() : array
    {
        return [
            'invokables' => [],
            'factories' => [],
        ];
    }

    /**
     * Returns the templates configuration
     *
     * @return array<string, array>
     */
    private function getTemplates() : array
    {
        return [
            'paths' => [
                'album' => [__DIR__ . '/../templates/'],
            ],
        ];
    }
}

Still I wonder about the error message, especially regarding the proposal for getTemplates().

Cheers,
LT.

[lowtower]

Just for the record:
phpstan seems to support these kind of docBlocks while phpcs does not