How can I uninstall a module with entities in the db?

Question

How can I uninstall a Drupal 8 module with entities in the db?

I have made a dev module that implement content entities created using the drupal console. I've added fields, views, and made some modifications. But, when I try to uninstall the module, there is a error:

The following reasons prevent the modules from being uninstalled:
There is content for the entity type: xxx

Where xxx is the entity type name. If I delete the entities manually or via code, I can disable the module. But I wanted a easier way, allowing the module to delete the entities itself. I tried using hook_uninstall(), but apparently it is called after the triggering error.

I did't found the answer googling. Maybe my wording was wrong...

Anyaway. Any help would be apreciated

Answer 1

There is some sort of a shortcut, but it might not be what you are looking for.

If you go the Uninstall tab of the Extend page, for all modules that define content entities you'll see:

The Remove content items link will delete all entities in a batch operation, after which you can uninstall the module. So you don't have to remove them one-by-one or from the database, but it requires some extra mouse clicks...

UPDATE

There is also hook_module_preuninstall($module), which might be of help for you.