.eslintrc.js

module.exports = {
  root: true,
  parserOptions: {
    ecmaVersion: 2017,
    sourceType: "module"
  },
  plugins: ["ember"],
  extends: ["eslint:recommended", "plugin:ember/recommended"],
  env: {
    browser: true
  },
  rules: {
    "arrow-body-style": "off",
    "comma-dangle": ["warn", "always-multiline"],
    "consistent-return": "off",
    curly: "error",
    "func-names": "off",
    "import/extensions": "off",
    "import/no-unresolved": "off",
    "import/no-extraneous-dependencies": "off",
    "max-len": [
      "warn",
      {
        code: 110,
        tabWidth: 2
      }
    ],
    "no-implicit-coercion": [
      "error",
      {
        boolean: false,
        number: true,
        string: true
      }
    ],
    "no-restricted-syntax": ["error", "ForOfStatement", "WithStatement"],
    "no-underscore-dangle": "off",
    "prefer-arrow-callback": "off",
    "prefer-const": "warn",
    "prefer-rest-params": "off"
  },
  overrides: [
    // node files
    {
      files: [
        "index.js",
        "testem.js",
        "ember-cli-build.js",
        "config/**/*.js",
        "tests/dummy/config/**/*.js"
      ],
      excludedFiles: ["app/**", "addon/**", "tests/dummy/app/**"],
      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
        }
      )
    }
  ]
};