ESlint usage incompatible with eslint.config.js

[NoiSek]

This action's default usage of --ext when using the eslint linter prevents the action from running when using the modern eslint.config.js flat file configuration.

This problem seems to have been highlighted by three other parties in #730, #739, and #759 but those issues were not addressed.

If there is no critical reason that this can't be updated, please keep this one open for discussion if possible. I would be happy to PR a fix for this myself if there are no major obstacles or objections.

[rkuykendall]

I think this may be a fix: #799

I just had it only use ext if the argument is passed in.

I can't tell how to test it or use it on my own repo though.

[rkuykendall]

I figured out how to use it in my repo but now I can't figure out how to make eslint_extensions optional.

[rkuykendall]

Also, eslint_extensions defaults to JS, so we may have a problem there. I wonder if using a version check on eslint somehow is a better solution.

[mismith]

Any luck with this? It would be great to get this released since there's currently no workaround, is there?

[alonapester]

It seems like in #799 that using version 8.56.0 made it work for me, but 9 still does not work

[0x0wen]

So does that mean this action doesn't support eslint v9? If not, do you guys have any recommendation that does?

[jake-perkins]

Any traction on this one ? We use this action and would like to support the v9 flows, Seems theres a PR already to add support