A feature request I have would be to add two flags to the mutant cli:
The --skip-subject flag should perform exactly the same as --ignore-subject, where it doesn't bother to mutate the subject nor run the subject's tests. This would be reserved for methods where attempting to mutate will cause an infinite loop and never finish.
If you are running your tests in watch mode by default (Jest or similar) you have your tests doing nothing forever when mutode is trying to run them.
It'd be great to have mutode realise this and warn the user, or perhaps set itself up to run common test runners in CI mode.