in flutter, when building an APK, where the unused installed packages go, does it be included even if we don't use it in the app or it will be removed

so I just go wondering, because sometimes it happens, when we install a package to the flutter project, after a while, we just don't use it anymore, when building the app, is it be included in the APK files, or flutter framework remove it and it doesn't use it, and should I delete the unused packages files or it doesn't matter if I leave it

thanks for reading