Not sure if there's anything that can be done for this, but I'm getting Multiple definitions exist for class Schema in PhpStorm.
Commenting out use Illuminate\Support\Facades\Schema; seems to stop the error, but I don't know if that's advisable.
I usually disable the inspection for it:

You can find it at PHP -> Code Style -> Unnecessary fully qualified name
For people looking for an updated answer to this you can view it here:
https://github.com/barryvdh/laravel-ide-helper/issues/592#issuecomment-355268633
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I usually disable the inspection for it:

You can find it at PHP -> Code Style -> Unnecessary fully qualified name