.eslintrc

{
  "env": {
      "browser": true,
      "es6": true,
      "node": true
  },
  "extends": "eslint:recommended",
  "globals": {
      "jasmine": "readonly",
      "beforeAll": "readonly",
      "afterAll": "readonly",
      "afterEach": "readonly",
      "it": "readonly",
      "describe": "readonly",
      "beforeEach": "readonly",
      "expect": "readonly"
  },
  "parser": "babel-eslint",
  "parserOptions": {
    "sourceType": "module",
    "allowImportExportEverywhere": true
  },
  "rules": {
      // Use 4 spaces as indent.
      "indent": [
          "error",
          2
      ],
      // Unix style line break is required.
      "linebreak-style": [
          "error",
          "unix"
      ],
      // Should only use double quote.
      "quotes": [
          "error",
          "single"
      ],
      // Semicolon is required.
      "semi": [
          "error",
          "never"
      ],
      // == is not allowed.
      "eqeqeq": "error",
      // if (someCondition) a = 1; is not allowed.
      "curly": "error",
      // https://eslint.org/docs/rules/dot-location
      "dot-location": [
          "error",
          "property"
      ],
      // a["abc"] is not allowed, use a.abc instead.
      "dot-notation": "error",
      // Do hasOwnProperty check in for in loop.
      "guard-for-in": "error",
      // Could not use eval.
      "no-eval": "error",
      // Could not extend native, e.g. Array, Object.
      "no-extend-native": "error",
      // Bind without using this is not allowed.
      "no-extra-bind": "error",
      // if (true) {{ a = 1 }} is not allowed.
      "no-lone-blocks": "error",
      // a =   1; is not allowed.
      "no-multi-spaces": "error",
      // var a = 071; is not allowed.
      "no-octal": "error",
      // var a = 1; var a = 2; is not allowed.
      "no-redeclare": "error",
      // a = a is not allowed.
      "no-self-assign": "error",
      // a === a is not allowed.
      "no-self-compare": "error",
      // a.foo.call(a, 1, 2) is not allowed.
      "no-useless-call": "error",
      // "\'" is not allowed, use "'" instead.
      "no-useless-escape": "error",
      // function () { this.a = 1; return; } is not allowed.
      "no-useless-return": "error",
      // parseInt("071") is not allowed, use parseInt("071", 10) instead.
      "radix": "error",
      // No shadowing variables are allowed.
      "no-shadow": "error",
      // Disallow undeclared variables.
      "no-undef": "error",
      // Disallow unused variables.
      "no-unused-vars": "error",
      // Disallow early use.
      "no-use-before-define": ["error", { "functions": false }],
      // Disallow or enforce spaces inside of blocks after opening block and before closing block.
      "block-spacing": "error", // Could also be "never".
      // https://eslint.org/docs/rules/brace-style
      "brace-style": "error",
      // Space before comma is not allowed, space after comma is required.
      "comma-spacing": "error",
      // Disallow or enforce spaces inside of computed properties.
      "computed-property-spacing": "error",
      // Disallow spacing between function identifiers and their invocations.
      "func-call-spacing": "error",
      // Enforce consistent spacing before and after keywords.
      "keyword-spacing": "error",
      // Disallow mixed spaces and tabs for indentation.
      "no-mixed-spaces-and-tabs": "error",
      // Disallow multiple empty lines.
      "no-multiple-empty-lines": ["error", { "max": 1 }],
      // Disallow trailing whitespace at the end of lines.
      "no-trailing-spaces": "error",
      // Disallow ternary operators when simpler alternatives exist.
      "no-unneeded-ternary": "error",
      // Disallow whitespace before properties.
      "no-whitespace-before-property": "error",
      // Enforce placing object properties on separate lines.
      "object-property-newline": ["error", { "allowAllPropertiesOnSameLine": true }],
      // Require or disallow padding within blocks.
      "padded-blocks": ["error", "never"],
      // Enforce location of semicolons to be last.
      "semi-style": "error",
      // Require Space Before Blocks.
      "space-before-blocks": "error",
      // Require a space before function parenthesis.
      "space-before-function-paren": ["error", {"anonymous": "always", "named": "never", "asyncArrow": "always"}],
      // Disallow spaces inside of parentheses.
      "space-in-parens": "error",
      // Require spacing around infix operators.
      "space-infix-ops": "error",
      // Require or disallow spaces before/after unary operators.
      "space-unary-ops": "error",
      // Requires a space or beginning a comment.
      "spaced-comment": "error",
      // Require space before/after arrow function's arrow.
      "arrow-spacing": "error",
      // Verify calls of super() in constructors.
      "constructor-super": "error",
      // Disallow modifying variables that are declared using const.
      "no-const-assign": "error",
      // Disallow duplicate name in class members.
      "no-dupe-class-members": "error",
      // Disallow use of this/super before calling super() in constructors.
      "no-this-before-super": "error",
      // Disallow unnecessary constructor.
      "no-useless-constructor": "error",
      // Suggest using template literals instead of string concatenation.
      "prefer-template": "error",
      // Enforce spacing between rest and spread operators and their expressions.
      "rest-spread-spacing": "error",
      // Enforce Usage of Spacing in Template Strings.
      "template-curly-spacing": "error",
      // Enforce a maximum line length.
      "max-len": ["error", { "code": 180 }],
      "object-curly-spacing": ["error", "always"]
  }
}