.eslintrc

{
  // Extend the AirBnb lint config
  "extends": "airbnb",
  "parserOptions": {
    "ecmaVersion": 6,
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,      
      "globalReturn": true,
      "impliedStrict": true,
      "jsx": true,
    },
    "sourceType": "module",
  },
  "env": {
    "es6": true,
    "browser": true,
    "node": true,
    "jquery": true,
    // Optional Enables
    "webextensions": false, // Enable if using Web Extensions
    // Optional Testing Frameworks
    "jasmine": false, // Enable if using Jasmine testing framework
    "protractor": false, // Enable if using Protractor testing framework
    "mocha": false // Enable if using Mocha testing framework
  },
  "globals": {
    "jQuery": true,
    "angular": false, // Enable if using Angular
  },
  // Do NOT change these rules
  "rules": {
    "indent": [2, 2, {"SwitchCase": 1}],
    "max-len": [2, 80, 4, {
      "ignoreComments": true,
      "ignoreUrls": true,
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true
    }],
    "quotes": [2, "single"], // Allows template literals if they have substitutions or line breaks
    "semi": [2, "always"],
    "no-multiple-empty-lines": [2, {"max": 1}],
    "comma-dangle": [2, "always-multiline"],
    "dot-location": [2, "property"],
    "one-var": [2, "never"],
    "no-var": [2], // Stop using var, use const or let instead
    "prefer-const": ["error"],
    "no-bitwise": [2],
    "id-length": ["error", {
      "properties": "never",
      "exceptions": ["x", "y", "i", "e", "n", "k"]
    }],
    "func-names": [1, "always"],  // This aids in debugging
    "no-use-before-define": [2, "nofunc"],
    "yoda": [2, "always"],
    "object-curly-spacing": [2, "always"],
    "array-bracket-spacing": [2, "never"],
    "space-unary-ops": [2, {"words": true, "nonwords": false, "overrides": {"!": true}}],
    "keyword-spacing": ["error", {"after": true}],
    "space-before-blocks": [2, "always"],
    "space-in-parens": [2, "never"],
    "spaced-comment": [2, "always"],
    "no-confusing-arrow": ["error", {"allowParens": true}], // See eslint config for reasons
    "no-constant-condition": ["error"],
    "arrow-parens": ["error", "always"],
    "operator-linebreak": ["error", "after"]
  }
}