Exclude code with regex

[ZHeadlee]

Is your feature request related to a problem? Please describe.
My project uses material-ui's style engine, so the CSS is included in the JS files. Stryker mutates the CSS, but this doesn't affect the functionality of the unit tests at all, so it is not useful. I have a similar issue with the prop-types library which does runtime type checking. Mutating this section also doesn't do anything, so I would like to exclude it.

Describe the solution you'd like
I would like to be able to exclude some of the code in a file from mutation specified via RegEx, for example:

Exclude the "makeStyles" CSS engine section of my code which looks like this:

const useStyles = makeStyles((theme) => ({
  button: {
    margin: theme.spacing(1),
  },
  buttonContainer: {
    display: 'flex',
    justifyContent: 'space-between',
  },
  caption: {
    textAlign: 'center',
    marginTop: '15%',
  },
  textField: { margin: theme.spacing(1) },
}));

with this expression: /.*makeStyles\(\((.|\n)*\}\)\).*/

Describe alternatives you've considered
I have considered using the mutation range config to specify what lines to mutate, but this would be tedious to do for my entire project, and my team would have to remember to update the lines any time the code is changed.

[nicojs]

Yeah, I've been thinking about this a lot. Would #1472 be something that could work for you? I think we would need a more robust solution in the future, but #1472 is being worked on a.t.m.

[nicojs]

The solution that I want to add is allowing for ignore-plugins. The idea is simple: it is provided a babel AST node, and it returns a boolean (or something like that) that specifies if the AST node should be ignored or not. But I first want to close #3072 .

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[nicojs]

Ignore-plugins are released in StrykerJS 7.3 🎉 . Ignoring something like makeStyles should be pretty easy, if you want help please don't hesitate to ask.

https://twitter.com/stryker_mutator/status/1713557660832792870

https://stryker-mutator.io/docs/stryker-js/disable-mutants/#using-an-ignore-plugin