.eslintrc.js

module.exports = {
  env: {
    browser: true,
    node: true,
    commonjs: true,
    es6: true,
  },
  globals: {
    _: true,
    sleep: 1,
  },
  plugins: ['json'],
  parser: 'babel-eslint',
  parserOptions: {
    sourceType: 'module',
    ecmaVersion: 8,
    allowImportExportEverywhere: true,
    ecmaFeatures: {
      modules: true,
    },
  },
  extends: ['eslint:recommended'],
  rules: {
    'no-empty': 0,
    'no-console': 0,
    'no-empty-pattern': 0,
    'no-cond-assign': 1,
    semi: 2,
    camelcase: 0,
    'comma-style': 2,
    'comma-dangle': [2, 'always-multiline'],
    indent: [2, 2, { SwitchCase: 1 }],
    // 'no-mixed-spaces-and-tabs': [2, 'smart-tabs'],
    'no-trailing-spaces': [2, { skipBlankLines: true }],
    'max-nested-callbacks': [2, 3],
    // 'no-eval': 2,
    'no-implied-eval': 2,
    'no-new-func': 2,
    // 'guard-for-in': 2,
    eqeqeq: 1,
    'no-else-return': 2,
    'no-redeclare': 2,
    'no-dupe-keys': 2,
    radix: 2,
    strict: [2, 'never'],
    'no-shadow': 0,
    'no-delete-var': 2,
    'no-undef-init': 2,
    'no-shadow-restricted-names': 2,
    'handle-callback-err': 0,
    'no-lonely-if': 2,
    'keyword-spacing': 2,
    'constructor-super': 2,
    'no-this-before-super': 2,
    'no-dupe-class-members': 2,
    'no-const-assign': 2,
    'prefer-spread': 2,
    'no-useless-concat': 2,
    'no-var': 2,
    'object-shorthand': 2,
    'prefer-arrow-callback': 2,
    'no-multiple-empty-lines': [2, { max: 2 }],
    quotes: [1, 'single', { allowTemplateLiterals: true }],
    'no-unused-vars': [
      2,
      {
        vars: 'all',
        args: 'after-used',
        argsIgnorePattern: '(^reject$|^_$|^req$)',
        varsIgnorePattern: '(^_$)',
      },
    ],
    'no-unused-expressions': [
      2,
      {
        allowTaggedTemplates: true,
        allowShortCircuit: true,
        allowTernary: false,
      },
    ],
  },
};