.eslintrc.js

module.exports = {
  root: true,
  parser: 'babel-eslint',
  parserOptions: {
    ecmaVersion: 2017,
    sourceType: 'module'
  },
  plugins: [
    'ember'
  ],
  extends: [
    'eslint:recommended',
    'plugin:ember/recommended'
  ],
  env: {
    browser: true
  },
  rules: {
    'no-unused-vars': [
      'error',
      { args: 'all', argsIgnorePattern: '^_', varsIgnorePattern: '[iI]gnored' },
    ],
    'no-console': 0,
    'require-yield': 0,
    quotes: ['error', 'single', { avoidEscape: true }],
    'comma-dangle': ['error', 'always-multiline'],
    curly: ['error', 'all'],
    'max-len': ['error', { code: 100, ignoreUrls: true }],
  },
  overrides: [
    // node files
    {
      files: [
        'ember-cli-build.js',
        'index.js',
        'testem.js',
        'blueprints/*/index.js',
        'config/**/*.js',
        'tests/dummy/config/**/*.js'
      ],
      parserOptions: {
        sourceType: 'script',
        ecmaVersion: 2015
      },
      env: {
        browser: false,
        node: true
      },
      plugins: ['node'],
      rules: Object.assign({}, require('eslint-plugin-node').configs.recommended.rules, {
        // add your custom rules and overrides for node files here
      })
    }
  ]
};