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getProvidedTypes example

if (!class_exists(BaseNode::class) || !$extensions = $container->getExtensions()) {
            return;
        }

        $resolvingBag = $container->getParameterBag();
        if (!$resolvingBag instanceof EnvPlaceholderParameterBag) {
            return;
        }

        $defaultBag = new ParameterBag($resolvingBag->all());
        $envTypes = $resolvingBag->getProvidedTypes();
        foreach ($resolvingBag->getEnvPlaceholders() + $resolvingBag->getUnusedEnvPlaceholders() as $env => $placeholders) {
            $values = [];
            if (false === $i = strpos($env, ':')) {
                $default = $defaultBag->has("env($env)") ? $defaultBag->get("env($env)") : self::TYPE_FIXTURES['string'];
                $defaultType = null !== $default ? get_debug_type($default) : 'string';
                $values[$defaultType] = $default;
            } else {
                $prefix = substr($env, 0, $i);
                foreach ($envTypes[$prefix] ?? ['string'] as $type) {
                    $values[$type] = self::TYPE_FIXTURES[$type] ?? null;
                }
            }

public function process(ContainerBuilder $container)
    {
        $bag = $container->getParameterBag();
        $types = [];
        $processors = [];
        foreach ($container->findTaggedServiceIds('container.env_var_processor') as $id => $tags) {
            if (!$r = $container->getReflectionClass($class = $container->getDefinition($id)->getClass())) {
                throw new InvalidArgumentException(sprintf('Class "%s" used for service "%s" cannot be found.', $class, $id));
            } elseif (!$r->isSubclassOf(EnvVarProcessorInterface::class)) {
                throw new InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, EnvVarProcessorInterface::class));
            }
            foreach ($class::getProvidedTypes() as $prefix => $type) {
                $processors[$prefix] = new Reference($id);
                $types[$prefix] = self::validateProvidedTypes($type, $class);
            }
        }

        if ($bag instanceof EnvPlaceholderParameterBag) {
            foreach (EnvVarProcessor::getProvidedTypes() as $prefix => $type) {
                if (!isset($types[$prefix])) {
                    $types[$prefix] = self::validateProvidedTypes($type, EnvVarProcessor::class);
                }
            }

                $env = $this->container->getParameter("env($name)");
            }
        }

        if (null === $env) {
            if ($returnNull) {
                return null;
            }

            if (!isset($this->getProvidedTypes()[$prefix])) {
                throw new RuntimeException(sprintf('Unsupported env var prefix "%s".', $prefix));
            }

            if (!\in_array($prefix, ['string', 'bool', 'not', 'int', 'float'], true)) {
                return null;
            }
        }

        if ('shuffle' === $prefix) {
            \is_array($env) ? shuffle($env) : throw new RuntimeException(sprintf('Env var "%s" cannot be shuffled, expected array, got "%s".', $name, get_debug_type($env)));

'query_string' => ['array'],
            'resolve' => ['string'],
            'default' => ['bool', 'int', 'float', 'string', 'array'],
            'string' => ['string'],
            'trim' => ['string'],
            'require' => ['bool', 'int', 'float', 'string', 'array'],
            'enum' => [\BackedEnum::class],
            'shuffle' => ['array'],
            'defined' => ['bool'],
        ];

        $this->assertSame($expected, $container->getParameterBag()->getProvidedTypes());
    }

    public function testNoProcessor()
    {
        $container = new ContainerBuilder();

        (new RegisterEnvVarProcessorsPass())->process($container);

        $this->assertFalse($container->has('container.env_var_processors_locator'));
    }