Argument #1 ($event) must be of type Drupal\scheduler\SchedulerEvent, Drupal\scheduler\Event\SchedulerEvent given

Instead of replacing the class I would add a class_exists check, that way we can keep it backwards compatible. Also, please start a MR, patches have been deprecated for a while on Drupal.org.

The error occurs because the SchedulerEvent class was moved from Drupal\scheduler\SchedulerEvent to Drupal\scheduler\Event\SchedulerEvent in a newer version of the Scheduler module that's the region

Update this old namespace use Drupal\scheduler\SchedulerEvent; // to New namespace use Drupal\scheduler\Event\SchedulerEvent;

The src/SchedulerEvent.php file in the scheduler module contains a class_alias statement that should prevent this error, but it seems like that file isn't being autoloaded. If I copy-paste that statement to the start of the subscriber file, the error doesn't occur. Maybe we could try manually instructing Composer to autoload that file.

Here's a simpler idea: let's add the class aliases to the scheduler.module file. Drupal core does this as well, in sdc.module.

Hi dieterholvoet
Please can you give a link to the core code where there is the example of doing this.

Also I think the version of Scheduler you mean for this change is 2.x ? I guess that this issue's version 8.x-1.x was a left-over from when it was raised in the Content Planner queue.

Yes, I changed the version. Here's sdc.module.

I think you are doing some work on this, as I see you created the issue fork 30 mins ago. The version was 8.x-1.x then, so you will need to update the fork to 2.x

This looks good, thanks for doing the changes.
I am going to add test coverage for the aliases, as that was not included before.

The tests work as expected. PHPUnit passes with the aliases moved, and there is one more test showing in the Events group.

The test only changes job, that is the new test but without the changes to the non-test code, failed as expected with the same error you got:

TypeError:
    Drupal\scheduler_api_legacy_test\EventSubscriber::apiTestNodePrePublish():
    Argument #1 ($event) must be of type Drupal\scheduler\SchedulerEvent,
    Drupal\scheduler\Event\SchedulerEvent given

Merged and fixed.

Can you use the -dev version of Scheduler to test this?
I could also make a new release soon, if it is urgent to fix your site?

Not urgent for me! I'm sure any other people can use the patch until a new release is created.

OK thanks for the feedback. This is the only bug fixed since 2.1.0 released 15 August , so I don't think we need a new release just yet