SyntaxError: Invalid regular expression flags From 6.6.0 Release

Tell us about your environment

• ESLint Version: 6.6.0
• Node Version: lts/carbon
• npm Version: 5.5.1

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

Please show your full configuration:

Configuration

My eslint-config extends: https://github.com/cerner/eslint-config-terra/blob/master/eslint.config.js

"eslintConfig": {
    "extends": "terra",
    "settings": {
      "polyfills": [
        "Promise"
      ]
    },
    "rules": {
      "import/no-extraneous-dependencies": "off",
      "import/no-unresolved": "off",
      "camelcase": "off",
      "class-methods-use-this": "off"
    },
},

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint. The latest eslitn version was pulled in during a CI build and failed lint tests.

I was able to reproduce by removing my node_modules dir locally and running install again. Running eslitn resulting in errors.

> eslint --ext .js,.jsx .

What actually happened? Please include the actual, raw output from ESLint. This recent change is causing builds to fail with the following error:

> eslint --ext .js,.jsx .

/Users/er047227/orion/chart-summary/chart-summary-component/node_modules/eslint/lib/source-code/source-code.js:426
        return /\s/u.test(text.replace(/\/\*.*?\*\//gus, ""));
                                       ^

SyntaxError: Invalid regular expression flags
    at NativeCompileCache._moduleCompile (/Users/er047227/orion/chart-summary/chart-summary-component/node_modules/v8-compile-cache/v8-compile-cache.js:242:18)
    at Module._compile (/Users/er047227/orion/chart-summary/chart-summary-component/node_modules/v8-compile-cache/v8-compile-cache.js:186:36)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Module.require (module.js:579:17)
    at require (/Users/er047227/orion/chart-summary/chart-summary-component/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
    at Object.<anonymous> (/Users/er047227/orion/chart-summary/chart-summary-component/node_modules/eslint/lib/source-code/index.js:4:17)
    at Module._compile (/Users/er047227/orion/chart-summary/chart-summary-component/node_modules/v8-compile-cache/v8-compile-cache.js:194:30)

[platinumazure]

Can we just make a change to not require this flag? The s flag just means dots represent newlines, right? Could we use something like [\s\S] instead of dot and then we could remove the s flag?

[kaicataldo]

The latest major release line of ESLint currently supports the following engines:

{
    "node": "^8.10.0 || ^10.13.0 || >=11.10.1"
}