GraphQL\Type\Definition\InputObjectType::getFields PHP Method

    public function getFields()
    {
        if (null === $this->fields) {
            $this->fields = [];
            $fields = isset($this->config['fields']) ? $this->config['fields'] : [];
            $fields = is_callable($fields) ? call_user_func($fields) : $fields;
            foreach ($fields as $name => $field) {
                if ($field instanceof Type) {
                    $field = ['type' => $field];
                }
                $field = new InputObjectField($field + ['name' => $name]);
                $this->fields[$field->name] = $field;
            }
        }
        return $this->fields;
    }