How to create recursive hierarchy?

[Kagayakashi]

I want to create recursive hierarchy as tree-like structure.

$fieldOptionsType = new ObjectType([
    'name' => 'Options',
    'fields' => [
        'nested' => [
            'type' => Type::listOf($fieldType), // $fieldType not initialized yet.
        ],
    ],
]);

$fieldType = new ObjectType([
    'name' => 'Field',
    'fields' => [
        'options' => [
            'type' => $fieldOptionsType,
        ],
    ],
]);

I have problem, that variable $fieldType used first isnt created yet. How to solve this?

[spawnia]

See https://webonyx.github.io/graphql-php/type-definitions/object-types/#recurring-and-circular-types