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My recommendation would be to not generate into the source tree, but into the

layout.buildDirectory

, then the

clean

task already deletes the files without a need for the specific clean task.

That indeed seems sensible, but sadly I'm configuring a task for a third-party plugin which doesn't let me decide where the files are generated. I'm adding

inputs

and

outputs

to get caching

I see. You could configure the

clean

task to delete that directory, or you can add that dependency, it's probably both ok in that situation.