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Bug: can't escape `]` in `.eslintignore`

See original GitHub issue

Environment

Node version: v14.17.0 npm version: v8.3.0 Local ESLint version: v8.9.0 (Currently used) Global ESLint version: Not found Operating System: darwin 21.2.0

What parser are you using?

Default (Espree)

What did you do?

Configuration

module.exports = {
  rules: {
    "no-console": "error",
  },
};

I’ve set up minimal example repository to reproduce the issue but I’ll describe the issue here as well.

I have a few files and some of them contain special characters like [.

➜  eslint-eslintignore-glob-pattern-issue git:(main) ✗ find src
src
src/index].js
src/[index].js
src/index.js
src/[index.js

I’d like to ignore all of them so I have them listed in an .eslintignore using \ to escape the special characters.

➜  eslint-eslintignore-glob-pattern-issue git:(main) ✗ cat .eslintignore 
src/index.js
src/\[index.js
src/index\].js
src/\[index\].js

What did you expect to happen?

All files listed in .eslintignore to be ignored, zero errors.

What actually happened?

Two of the files won’t be ignored when I lint them using ESLint.

➜  eslint-eslintignore-glob-pattern-issue git:(main) ✗ npm run lint

> eslint-eslintignore-glob-pattern-issue@1.0.0 lint
> eslint '**/*.js' --ignore-path .eslintignore


[removed]/eslint-eslintignore-glob-pattern-issue/src/[index].js
  1:1  error  Unexpected console statement  no-console

[removed]/eslint-eslintignore-glob-pattern-issue/src/index].js
  1:1  error  Unexpected console statement  no-console

✖ 2 problems (2 errors, 0 warnings)

Participation

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

Additional comments

The same glob patterns work in .gitignore.

➜  eslint-eslintignore-glob-pattern-issue git:(main) cat .gitignore
node_modules/
src/\[app\].js
src/app\].js
➜  eslint-eslintignore-glob-pattern-issue git:(main) git status --ignored
On branch main
Ignored files:
  (use "git add -f <file>..." to include in what will be committed)
        node_modules/
        src/[app].js
        src/app].js

nothing to commit, working tree clean