.eslintrc.js

module.exports = {
  extends: ['eslint:recommended', 'prettier'], // extending recommended config and config derived from eslint-config-prettier
  plugins: ['prettier'], // activating esling-plugin-prettier (--fix stuff)
  parser: "babel-eslint",
  env: {
    "browser": true,
    "es6": true,
    "node": true
  },
  parserOptions: {
    sourceType: "module",
    allowImportExportEverywhere: false,
    ecmaFeatures: {
      globalReturn: false,
    },
    babelOptions: {
      configFile: ".babelrc",
    },
  },
  rules: {
    "no-console": 0,
    'prettier/prettier': [ // customizing prettier rules (unfortunately not many of them are customizable)
      'error',
      {
        singleQuote: true,
        trailingComma: 'all',
      },
    ],
    eqeqeq: ['error', 'always'], // adding some custom ESLint rules
  },
};