.eslintrc.js

module.exports = {
  plugins: ['standard'],
  extends: [
    'eslint:recommended',
    // Adds 'promise'/'import'/'node' plugins and configurations
    'standard',
    // Adds 'prettier' plugin
    'plugin:prettier/recommended',
    'prettier/standard',
  ],
  parserOptions: {
    ecmaVersion: 8,
    sourceType: 'module',
  },
  env: {
    node: true,
    es6: true,
  },
  rules: {
    // Fixable - errors
    'one-var': [
      'error',
      {
        const: 'never',
        let: 'never',
      },
    ],
    'dot-notation': 'error',
    'no-else-return': ['error', {allowElseIf: false}],
    'capitalized-comments': 'error',
    'linebreak-style': 'off',
    'lines-between-class-members': 'error',
    'multiline-comment-style': 'error',
    'no-lonely-if': 'error',
    'operator-assignment': 'error',
    'padding-line-between-statements': 'error',
    'arrow-body-style': 'error',
    // 'no-confusing-arrow': ['error', {'allowParens': true}],
    'no-var': 'error',
    'object-shorthand': 'error',
    'prefer-const': 'error',
    'prefer-numeric-literals': 'error',
    'prefer-spread': 'error',
    'prefer-template': 'error',
    'sort-imports': 'error',

    // Non-fixable - warnings
    'no-await-in-loop': 'warn',
    'array-callback-return': 'warn',
    'block-scoped-var': 'warn',
    // 'class-methods-use-this': 'warn',
    complexity: 'warn',
    'consistent-return': 'warn',
    'default-case': 'warn',
    'guard-for-in': 'warn',
    'no-alert': 'warn',
    'no-eq-null': 'warn',
    'no-implicit-globals': 'warn',
    'no-invalid-this': 'warn',
    'no-loop-func': 'warn',
    // 'no-magic-numbers': 'warn',
    'no-param-reassign': 'warn',
    'no-script-url': 'warn',
    'no-useless-concat': 'warn',
    'no-void': 'warn',
    'no-warning-comments': 'warn',
    radix: 'warn',
    'require-await': 'warn',
    'init-declarations': 'warn',
    'no-catch-shadow': 'warn',
    'no-shadow': 'warn',
    'no-undefined': 'warn',
    'callback-return': 'warn',
    'global-require': 'warn',
    'no-buffer-constructor': 'warn',
    'no-mixed-requires': 'warn',
    'no-process-exit': 'warn',
    'no-sync': 'warn',
    'consistent-this': 'warn',
    'func-name-matching': 'warn',
    'func-names': 'warn',
    'func-style': ['warn', 'declaration', {allowArrowFunctions: true}],
    'line-comment-position': 'warn',
    'max-depth': 'warn',
    'max-nested-callbacks': 'warn',
    'no-bitwise': 'warn',
    'no-continue': 'warn',
    'no-inline-comments': 'warn',
    'no-multi-assign': 'warn',
    'no-negated-condition': 'warn',
    'no-nested-ternary': 'warn',
    'no-plusplus': 'warn',
    'no-underscore-dangle': 'warn',
    'prefer-destructuring': 'warn',
    'prefer-rest-params': 'warn',
  },
};