ES Lint

Set the type to ES module in the config.

  • `.eslintrc.json 
      {
    "parserOptions": {
      "sourceType": "module"
    }
  }

Based on answer on the ESLint repo’s issues.

ESLint cannot figure out the type from here:

  • package.json 
      {
    "type": "module"
  }

Or at least not in my testing with multiple packages in one and no root package.json.

Prettier

ESLint defaults to ES5 syntax-checking. So it rejects const and import keywords.

Here you can support modern JavaScript.

  • .eslintrc.json 
      {
      "parserOptions": {
          "ecmaVersion": 2017
      },

      "env": {
          "es6": true
      }
  }