Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/51658/

The current behavior is not a bug, but it is purposefully as an option whose only behavior is to suppress an error. Normally a babel.config.json is required when using @babel/eslint-parser (otherwise it throws), and setting requireConfigFile: false makes it optional (that's also why the option is named requireConfigFile: false and not configFile: false). If we want to make this change, it should go in a major because it changes an explicitly designed behavior.

However, what we could do is to make babelOptions.configFile: false imply requireConfigFile: false, so that users don't have to specify both (since they are already explicitly excluding babel.config.json).