di-service-provider.php

<?php

abstract class ServiceProvider implements DefinitionSource
{
    /**
     * @return array
     */
    abstract protected function definitions(): array;

    /**
     * {@inheritdoc}
     */
    public function getDefinition($name): ?Definition
    {
        static $definitionArray;

        if (!$definitionArray) {
            $definitionArray = new DefinitionArray($this->definitions());
        }

        return $definitionArray->getDefinition($name);
    }
}