CompiledFieldCollection example

#[Package('core')] class FieldCollection extends Collection
{
    public function compile(DefinitionInstanceRegistry $registry): CompiledFieldCollection
    {
        /** @var Field $field */
        foreach ($this->elements as $field) {
            $field->compile($registry);
        }

        return new CompiledFieldCollection($registry, $this->elements);
    }

    public function getApiAlias(): string
    {
        return 'dal_field_collection';
    }

    protected function getExpectedClass(): ?string
    {
        return Field::class;
    }
}