There are some things to do, but not if you want to trust random third parties. In which case nothing will save you, because not only you have to trust them, yo

There are some things to do, but not if you want to trust random third parties. In which case nothing will save you, because not only you have to trust them, you also have to trust they are not compromised and have impenetrable security. So, not trusting third parties is the only way and with that language level capability based security can help. Although this is pretty far from common programming languages where any function can access any file, environment variable, global variable, constant, socket, etc.