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

You have to use this plugin: https://github.com/babel/eslint-plugin-babel

You can then disable the original eslint-rule and enable the babel version of it, which will then show no false errors. Your eslint-config could then look like this:

{
  parser: "babel-eslint",
  rules: {
    "no-unused-expressions": 0,
    "babel/no-unused-expressions": 1
  },
  plugins: ["babel"]
}