Sample eslintrc Config File

.eslintrc.js

module.exports = {
    "extends": ['eslint:recommended'], // extending recommended config and config derived from eslint-config-prettier
    "plugins": ['prettier'], // activating esling-plugin-prettier (--fix stuff)
    "rules": {
      'prettier/prettier': [ // customizing prettier rules (unfortunately not many of them are customizable)
        'error',
        {
          "singleQuote": true, 
          "trailingComma": 'none',
          "useTabs": false,
          "tabWidth": 4
        },
      ],
      "no-constant-condition": 2, // disallow use of constant expressions in conditions
      "no-control-regex": 2, // disallow control characters in regular expressions
      "no-debugger": 2, // disallow use of debugger
      "no-dupe-args": 2, // disallow duplicate arguments in functions
      "no-dupe-keys": 2, // disallow duplicate keys when creating object literals
      "no-duplicate-case": 2, // disallow a duplicate case label.
      "no-empty": 2, // disallow empty statements
      "no-ex-assign": 2, // disallow assigning to the exception in a catch block
      "no-extra-boolean-cast": 2, // disallow double-negation boolean casts in a boolean context
      "no-extra-parens": 0, // disallow unnecessary parentheses (off by default)
      "no-extra-semi": 2, // disallow unnecessary semicolons
      "no-func-assign": 2, // disallow overwriting functions written as function declarations
      "no-inner-declarations": 2, // disallow function or variable declarations in nested blocks
      "no-invalid-regexp": 2, // disallow invalid regular expression strings in the RegExp constructor
      "no-irregular-whitespace": 2, // disallow irregular whitespace outside of strings and comments
      "no-negated-in-lhs": 2, // disallow negation of the left operand of an in expression
      "no-obj-calls": 2, // disallow the use of object properties of the global object (Math and JSON) as functions
      "no-regex-spaces": 2, // disallow multiple spaces in a regular expression literal
      "no-sparse-arrays": 2, // disallow sparse arrays
      "no-unreachable": 2, // disallow unreachable statements after a return, throw, continue, or break statement
      "use-isnan": 2, // disallow comparisons with the value NaN
      "valid-jsdoc": 2, // Ensure JSDoc comments are valid (off by default)
      "valid-typeof": 2, // Ensure that the results of typeof are compared against a valid string
    },
    "parserOptions": {
      'ecmaVersion': 2017
    },
  
    "env": {
      'es6': true,
      'node': true
    }
  };