possible-errors.js

module.exports = {
  env: {
    browser: true,
    node: true,
  },
  rules: {
    'for-direction': 'error',
    'getter-return': [
      'error',
      {
        allowImplicit: true,
      },
    ],
    'no-cond-assign': ['error', 'except-parens'],
    'no-console': 'error',
    'no-constant-condition': 'error',
    'no-control-regex': 'error',
    'no-compare-neg-zero': 'error',
    'no-debugger': 'error',
    'no-dupe-args': 'error',
    'no-dupe-keys': 'error',
    'no-duplicate-case': 'error',
    'no-empty-character-class': 'error',
    'no-empty': 'error',
    'no-ex-assign': 'error',
    'no-extra-boolean-cast': 'warn',
    'no-func-assign': 'error',
    'no-inner-declarations': 'error',
    'no-invalid-regexp': 'error',
    'no-irregular-whitespace': 'error',
    'no-negated-in-lhs': 'error',
    'no-obj-calls': 'error',
    'no-prototype-builtins': 'warn',
    'no-regex-spaces': 'error',
    'no-sparse-arrays': 'error',
    'no-template-curly-in-string': 'error',
    'no-unexpected-multiline': 'warn',
    'no-unreachable': 'error',
    'no-unsafe-finally': 'error',
    'no-unsafe-negation': 'error',
    'use-isnan': 'error',
    'valid-jsdoc': [
      'error',
      {
        requireReturn: false,
      },
    ],
    'valid-typeof': [
      'warn',
      {
        requireStringLiterals: true,
      },
    ],
    'no-extra-parens': [
      'off',
      'all',
      {
        conditionalAssign: true,
        nestedBinaryExpressions: false,
        returnAssign: false,
        ignoreJSX: 'all',
        enforceForArrowConditionals: false,
      },
    ],
    'no-extra-semi': 'off',

    // Variables
    'no-use-before-define': [
      'error',
      {
        functions: false,
        classes: false,
        variables: false,
      },
    ],
  },
};