.eslintrc.js

module.exports = {
  root: true,
  parserOptions: {
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  plugins: ['ember', 'prettier'],
  extends: ['eslint:recommended', 'plugin:ember/recommended'],
  env: {
    browser: true,
  },
  rules: {
    'prettier/prettier': 'error',
  },
  overrides: [
    // node files
    {
      files: [
        '.eslintrc.js',
        '.template-lintrc.js',
        '.prettierrc.js',
        'ember-cli-build.js',
        'testem.js',
        'blueprints/*/index.js',
        'config/**/*.js',
        'lib/*/index.js',
        'server/**/*.js',
      ],
      parserOptions: {
        sourceType: 'script',
      },
      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
          // this can be removed once the following is fixed
          // https://github.com/mysticatea/eslint-plugin-node/issues/77
          'node/no-unpublished-require': 'off',
        }
      ),
    },

    // test files
    {
      files: ['tests/**/*.js', 'mirage/**/*.js'],
      excludedFiles: ['tests/dummy/**/*.js'],
      env: {
        embertest: true,
      },
    },
  ],
};