Environment

Node version: 19.7.0
npm version: 9.5.0
Local ESLint version: 8.37.0
Global ESLint version: N/A
Operating System: windows 10 x64

What parser are you using?

Default (Espree)

What did you do?

When passing cwd option to eslint with a path with forward slash on windows (C:/path/to/project), eslintignore breaks and errors were reported from ignored files.

folder structure:

src/1.js
src/dist/2.js
.eslintignore
.eslintrc.js
lint.js

console.log(1)

console.log(2)

src/dist

const eslint = require('eslint');

const run = async (cwd) => {
  // 1. Create an instance.
  const instance = new eslint.ESLint({ cwd, extensions: ['.js'] });

  // 2. Lint files.
  const results = await instance.lintFiles(["./src"]);

  // 3. Format the results.
  const formatter = await instance.loadFormatter("stylish");
  const resultText = formatter.format(results);

  // 4. Output it.
  console.log(resultText);
};

const main = async () => {
  await run(__dirname);
  console.log('-----------');
  await run(__dirname.replaceAll("\\", "/"));
};

main();

module.exports = {
  parserOptions: {
    ecmaVersion: 2020,
  },
  'root': true,
  'rules': {
    'semi': 'error',
  },
};

C:\src\eslinttest\src\1.js
  1:15  error  Missing semicolon  semi

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

-----------

C:\src\eslinttest\src\1.js
  1:15  error  Missing semicolon  semi

C:\src\eslinttest\src\dist\2.js
  1:15  error  Missing semicolon  semi

✖ 2 problems (2 errors, 0 warnings)
  2 errors and 0 warnings potentially fixable with the `--fix` option.

What did you expect to happen?

eslintignore working as expected

What actually happened?

linting ignored files

Participation

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

Additional comments

Where I get this problem? Here.
I'm using vite-plugin-checker on my project. It pass a root param recieved from vite to eslint cwd option which happens to be a path with forward slash on windows.