.eslintrc.js

module.exports = {
  root: true,
  parser: '@babel/eslint-parser',
  parserOptions: {
    requireConfigFile: false,
    ecmaVersion: '2018',
    sourceType: 'module',
    ecmaFeatures: {
      legacyDecorators: true
    }
  },
  plugins: ['ember'],
  extends: ['eslint:recommended', 'plugin:ember/recommended', 'standard'],
  env: {
    browser: true
  },
  rules: {},
  overrides: [
    // node files
    {
      files: [
        'index.js',
        'testem.js',
        'ember-cli-build.js',
        'blueprints/*.js',
        'config/**/*.js',
        'tests/dummy/config/**/*.js'
      ],
      excludedFiles: ['app/**', 'addon/**', 'tests/dummy/app/**'],
      parserOptions: {
        sourceType: 'script',
        ecmaVersion: 'latest'
      },
      env: {
        browser: false,
        node: true
      }
    }
  ]
}