Environment

Node version: v16.14.0
npm version: v8.3.1
Local ESLint version: v8.23.0 (Currently used)
Global ESLint version: Not found
Operating System: win32 10.0.19044

What parser are you using?

Default (Espree)

What did you do?

# .eslintignore

foo/
!bar.js

// eslint.config.js

module.exports = [{
    rules: {
        semi: "error"
    }
}];

// foo/bar.js

a

npx eslint foo/bar.js

What did you expect to happen?

0:0  warning  File ignored because of a matching ignore pattern. Use "--no-ignore" to override

Per the .gitignore specification, foo/bar.js should be ignored because it is not possible to re-include a file if a parent directory of that file is excluded. With an equivalent .eslintrc.js config file in place of the eslint.config.js config file, foo/bar.js would be ignored.

What actually happened?

  1:2  error  Missing semicolon  semi

✖ 1 problem (1 error, 0 warnings)
  1 error and 0 warnings potentially fixable with the `--fix` option.

Participation

• I am willing to submit a pull request for this issue.

Additional comments

There may be other differences between the .gitignore spec and our custom interpretation of the patterns, so it might be better to keep using the ignore library (assuming that .eslintignore should still behave like .gitignore).