How to lint cosmiconfig files?

[titanism]

It still seems like there's no workaround for cosmiconfig file linting, or perhaps our usage is wrong.

For example, .xo-config.js is not linted, nor is .remarkrc.js and .pug-lintrc.js.

We've tried adding extensions: [''] and extensions: ['.xo-config.js'] even as a test to the XO config, but it still isn't linting those files. Not all config files support non-dotfile naming conventions, which makes this impossible to lint. We've also tried checking --print-config output too, and nothing seems to fix it.

Curious if you have a workaround @sindresorhus? And if so, what is it so we can document it?

[titanism]

This seems to fix the issue:

echo '!.*.js' >> .eslintignore