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Compiler passes

Compiler passes give you an opportunity to manipulate other service definitions that have been registered with the service container. It's a mechanism copied from Symfony: https://symfony.com/doc/current/service_container/compiler_passes.html

The existing compiler passes are mainly used to auto discover classes tagged with a class attribute.

./config/compiler-passes.php contains al passes that will be processed by the container builder. Check out DI Container for a more detailed explanation about compiler passes.

config/compiler-passes.php
return [
    // Compiler pass to auto discover console commands.
    new ConsoleCommandCompilerPass(),
    // Compiler pass to auto discover command handlers.
    new CommandHandlerCompilerPass(),
    // Compiler pass to auto discover event listeners.
    new EventListenerCompilerPass(),
    // Compiler pass to auto discover AMQP queues.
    new QueueCompilerPass(),
];