Eslint fails to parse and red-highlights optional chaining (?.) and nullish coalescing (??) operators

Question

I am looking for the relevant eslint rules for

• @babel/plugin-proposal-optional-chaining
• @babel/plugin-proposal-nullish-coalescing-operator

Answer 1

Nullish coalescing operator is natively supported starting from eslint>=7.5.0.

The easiest is set ES2020 in your package.json:

{
  "eslintConfig":
  {
    "parserOptions":
    {
      "ecmaVersion": 2020
    }
  }
}