Error while running ESLint: Invalid regular expression flags

Tell us about your environment

• ESLint Version: 6.6.0
• Node Version: 12.13.0
• npm Version: 6.12.0

What parser (default, Babel-ESLint, etc.) are you using? default

Please show your full configuration:

Configuration

env:
  browser: true
  es6: true
  node: true
extends:
  - standard
globals:
  Atomics: readonly
  SharedArrayBuffer: readonly
parserOptions:
  ecmaFeatures:
    jsx: true
  ecmaVersion: 2018
  sourceType: module
plugins:
  - react
rules: {}

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint. Creating any *.js file trigger the error. My linter in Atom report the following

What did you expect to happen? No linter error flag when a JS file is created

What actually happened? Please include the actual, raw output from ESLint.

Error while running ESLint: Invalid regular expression flags
Invalid regular expression flags
Referenced from: /Users/me/dev/.eslintrc.yml

/Users/me/dev/node_modules/eslint/lib/source-code/source-code.js:426
return /\s/u.test(text.replace(/\/\*.*?\*\//gus, ""));
                               ^

[damien-git]

The related lint-eslint plugin issue is at https://github.com/AtomLinter/linter-eslint/issues/1306 . This led me to update Atom to version 1.42, which fixed the problem.

[anatoly314]

I think that I know how to solve the issue, at least with WebStorm it works. It looks like Webstorm grabs on startup default Node/NPM version. If you manage multiple Node/NPM versions by nvm and the default one is v8.9.1 like in my scenario it won’t work.

To fix it you need to go to: Webstorm -> Preferences -> Languages and Frameworks -> Node.js and NPM and select correct Node interpreters, see screenshot below: