index.js

"use strict";

module.exports = {
  env: {
    es6: true,
  },

  parserOptions: {
    ecmaVersion: 2018,
  },

  rules: {
    // disallow modifying variables of class declarations
    "no-class-assign": "error",

    // disallow modifying variables that are declared using const
    "no-const-assign": "error",

    // disallow use of constant expressions in conditions
    "no-constant-condition": "error",

    // disallow duplicate name in class members
    "no-dupe-class-members": "error",

    // disallow template literals in normal strings
    "no-template-curly-in-string": "error",

    // disallow use of this/super before calling super() in constructors.
    "no-this-before-super": "error",

    // require let or const instead of var
    "no-var": "error",

    // require method and property shorthand syntax for object literals
    "object-shorthand": "warn",

    // Use arrow functions instead of anonymous functions for callbacks
    "prefer-arrow-callback": [
      "error",
      {
        allowNamedFunctions: true,     // unless the function is named
      }
    ],

    // disallow generator functions that do not have yield
    "require-yield": "error",
  }
};