.eslintrc.json

{
    "parser": "babel-eslint",
    "plugins": [
      "react",
      "babel",
      "jsx",
      "prettier"
    ],
    "extends": ["plugin:react/recommended", "prettier"],
    "parserOptions": {
      "ecmaVersion": 2016,
      "sourceType": "module",
        "ecmaFeatures": {
        "jsx": true
      }
    },
    "env": {
      "browser": true,
      "jasmine": true,
      "jest": true
    },
    "globals": {
      "document": true,
      "console": true,
      // Only for development purposes
      "setTimeout": true,
      "window" : true
    },
    "rules": {
      "prettier/prettier": "error",
      // Enforce the spacing around the * in generator functions.
      "generator-star-spacing": [2, "after"],
      // Disallow using variables outside the blocks they are defined (especially
      // since only let and const are used, see "no-var").
      "block-scoped-var": 2,
      // Allow trailing commas for easy list extension.  Having them does not
      // impair readability, but also not required either.
      "comma-dangle": 0,
      // Don't warn for inconsistent naming when capturing this (not so important
      // with auto-binding fat arrow functions).
      "consistent-this": 0,
      // Enforce curly brace conventions for all control statements.
      "curly": 2,
      // Don't require a default case in switch statements. Avoid being forced to
      // add a bogus default when you know all possible cases are handled.
      "default-case": 0,
      // Encourage the use of dot notation whenever possible.
      "dot-notation": 2,
      // Allow mixed 'LF' and 'CRLF' as linebreaks.
      "linebreak-style": 0,
      // Don't enforce the maximum depth that blocks can be nested.
      "max-depth": 0,
      // Maximum length of a line.
      "max-len": [2, 90, 2, { "ignoreStrings": true, "ignoreUrls": true}],
      // Maximum depth callbacks can be nested.
      "max-nested-callbacks": [2, 3],
      // Don't limit the number of parameters that can be used in a function.
      "max-params": 0,
      // Don't limit the maximum number of statement allowed in a function.
      "max-statements": 0,
      // Require a capital letter for constructors, only check if all new
      // operators are followed by a capital letter. Don't warn when capitalized
      // functions are used without the new operator.
      "new-cap": [2, {"capIsNew": false}],
      // Disallow use of the Array constructor.
      "no-array-constructor": 2,
      // Allow use of bitwise operators.
      "no-bitwise": 0,
      // Disallow use of arguments.caller or arguments.callee.
      "no-caller": 2,
      // Disallow the catch clause parameter name being the same as a variable in
      // the outer scope, to avoid confusion.
      "no-catch-shadow": 2,
      // Disallow assignment in conditional expressions.
      "no-cond-assign": 2,
      // Allow using the console API.
      "no-console": 0,
      // Allow using constant expressions in conditions like while (true)
      "no-constant-condition": 0,
      // Allow use of the continue statement.
      "no-continue": 0,
      // Disallow control characters in regular expressions.
      "no-control-regex": 2,
      // Disallow deletion of variables (deleting properties is fine).
      "no-delete-var": 2,
      // Disallow duplicate arguments in functions.
      "no-dupe-args": 2,
      // Disallow duplicate keys when creating object literals.
      "no-dupe-keys": 2,
      // Disallow multiple empty lines
      "no-multiple-empty-lines": "error",
      // Disallow a duplicate case label.
      "no-duplicate-case": 2,
      // Disallow else after a return in an if. The else around the second return
      // here is useless:
      // if (something) { return false; } else { return true; }
      "no-else-return": 2,
      // Disallow empty statements. This will report an error for:
      // try { something(); } catch (e) {}
      // but will not report it for:
      // try { something(); } catch (e) { /* Silencing the error because ...*/ }
      // which is a valid use case.
      "no-empty": 2,
      // Disallow the use of empty character classes in regular expressions.
      "no-empty-character-class": 2,
      // Disallow use of labels for anything other then loops and switches.
      "no-labels": 2,
      // Disallow use of eval(). We have other APIs to evaluate code in content.
      "no-eval": 2,
      // Disallow assigning to the exception in a catch block.
      "no-ex-assign": 2,
      // Disallow adding to native types
      "no-extend-native": 2,
      // Disallow unnecessary function binding.
      "no-extra-bind": 2,
      // Disallow double-negation boolean casts in a boolean context.
      "no-extra-boolean-cast": 2,
      // Allow unnecessary parentheses, as they may make the code more readable.
      "no-extra-parens": 0,
      // Disallow fallthrough of case statements, except if there is a comment.
      "no-fallthrough": 2,
      // Allow the use of leading or trailing decimal points in numeric literals.
      "no-floating-decimal": 0,
      // Disallow if as the only statement in an else block.
      "no-lonely-if": 2,
      // Disallow use of multiline strings (use template strings instead).
      "no-multi-str": 2,
      // Disallow reassignments of native objects.
      "no-native-reassign": 2,
      // Disallow nested ternary expressions, they make the code hard to read.
      "no-nested-ternary": 2,
      // Allow use of new operator with the require function.
      "no-new-require": 0,
      // Disallow use of octal literals.
      "no-octal": 2,
      // Allow reassignment of function parameters.
      "no-param-reassign": 0,
      // Allow string concatenation with __dirname and __filename (not a node env).
      "no-path-concat": 0,
      // Allow use of unary operators, ++ and --.
      "no-plusplus": 0,
      // Allow using process.env (not a node environment).
      "no-process-env": 0,
      // Allow using process.exit (not a node environment).
      "no-process-exit": 0,
      // Disallow usage of __proto__ property.
      "no-proto": 2,
      // Disallow declaring the same variable more than once (we use let anyway).
      "no-redeclare": 2,
      // Disallow multiple spaces in a regular expression literal.
      "no-regex-spaces": 2,
      // Allow reserved words being used as object literal keys.
      "no-reserved-keys": 0,
      // Don't restrict usage of specified node modules (not a node environment).
      "no-restricted-modules": 0,
      // Disallow use of assignment in return statement. It is preferable for a
      // single line of code to have only one easily predictable effect.
      "no-return-assign": 2,
      // Allow use of javascript: urls.
      "no-script-url": 0,
      // Disallow comparisons where both sides are exactly the same.
      "no-self-compare": 2,
      // Disallow use of comma operator.
      "no-sequences": 2,
      // Warn about declaration of variables already declared in the outer scope.
      // This isn't an error because it sometimes is useful to use the same name
      // in a small helper function rather than having to come up with another
      // random name.
      // Still, making this a warning can help people avoid being confused.
      "no-shadow": 2,
      // Require empty line at end of file
      "eol-last": "error",
      // Disallow shadowing of names such as arguments.
      "no-shadow-restricted-names": 2,
      "no-space-before-semi": 0,
      // Disallow sparse arrays, eg. let arr = [,,2].
      // Array destructuring is fine though:
      // for (let [, breakpointPromise] of aPromises)
      "no-sparse-arrays": 2,
      // Allow use of synchronous methods (not a node environment).
      "no-sync": 0,
      // Allow the use of ternary operators.
      "no-ternary": 0,
      // Don't allow spaces after end of line
      "no-trailing-spaces": "error",
      // Disallow throwing literals (eg. throw "error" instead of
      // throw new Error("error")).
      "no-throw-literal": 2,
      // Disallow use of undeclared variables unless mentioned in a /*global */
      // block. Note that globals from head.js are automatically imported in tests
      // by the import-headjs-globals rule form the mozilla eslint plugin.
      "no-undef": 2,
      // Allow use of undefined variable.
      "no-undefined": 0,
      // Disallow the use of Boolean literals in conditional expressions.
      "no-unneeded-ternary": 2,
      // Disallow unreachable statements after a return, throw, continue, or break
      // statement.
      "no-unreachable": 2,
      // Disallow global and local variables that arent used, but allow unused function arguments.
      "no-unused-vars": [2, {"vars": "all", "args": "none"}],
      // Allow using variables before they are defined.
      "no-use-before-define": 0,
      // We use var-only-at-top-level instead of no-var as we allow top level
      // vars.
      "no-var": 0,
      // Allow using TODO/FIXME comments.
      "no-warning-comments": 0,
      // Disallow use of the with statement.
      "no-with": 2,
      // Dont require method and property shorthand syntax for object literals.
      // We use this in the code a lot, but not consistently, and this seems more
      // like something to check at code review time.
      "object-shorthand": 0,
      // Allow more than one variable declaration per function.
      "one-var": 0,
      // Single quotes should be used.
      "quotes": [2, "single", "avoid-escape"],
      // Require use of the second argument for parseInt().
      "radix": 2,
      // disallow the use of deprecated react changes and lifecycle methods
      "react/no-deprecated": 1,
      // Dont require to sort variables within the same declaration block.
      // Anyway, one-var is disabled.
      "sort-vars": 0,
      "space-after-function-name": 0,
      "space-before-function-parentheses": 0,
      // Disallow space before function opening parenthesis.
      //"space-before-function-paren": [2, "never"],
      // Disable the rule that checks if spaces inside {} and [] are there or not.
      // Our code is split on conventions, and itd be nice to have 2 rules
      // instead, one for [] and one for {}. So, disabling until we write them.
      "space-in-brackets": 0,
      // Deprecated, will be removed in 1.0.
      "space-unary-word-ops": 0,
      // Require a space immediately following the // in a line comment.
      "spaced-comment": [2, "always"],
      // Require "use strict" to be defined globally in the script.
      "strict": [2, "global"],
      // Disallow comparisons with the value NaN.
      "use-isnan": 2,
      // Warn about invalid JSDoc comments.
      // Disabled for now because of https://github.com/eslint/eslint/issues/2270
      // The rule fails on some jsdoc comments like in:
      // devtools/client/webconsole/console-output.js
      "valid-jsdoc": 0,
      // Ensure that the results of typeof are compared against a valid string.
      "valid-typeof": 2,
      // Allow vars to be declared anywhere in the scope.
      "vars-on-top": 0,
      // Dont require immediate function invocation to be wrapped in parentheses.
      "wrap-iife": 0,
      // Don't require regex literals to be wrapped in parentheses (which
      // supposedly prevent them from being mistaken for division operators).
      "wrap-regex": 0,
      // Require for-in loops to have an if statement.
      "guard-for-in": 0,
      // allow/disallow an empty newline after var statement
      "newline-after-var": 0,
      // disallow the use of alert, confirm, and prompt
      "no-alert": 0,
      // disallow comparisons to null without a type-checking operator
      "no-eq-null": 0,
      // disallow overwriting functions written as function declarations
      "no-func-assign": 0,
      // disallow use of eval()-like methods
      "no-implied-eval": 0,
      // disallow function or variable declarations in nested blocks
      "no-inner-declarations": 0,
      // disallow invalid regular expression strings in the RegExp constructor
      "no-invalid-regexp": 0,
      // disallow irregular whitespace outside of strings and comments
      "no-irregular-whitespace": 0,
      // disallow unnecessary nested blocks
      "no-lone-blocks": 0,
      // disallow creation of functions within loops
      "no-loop-func": 0,
      // disallow use of new operator when not part of the assignment or
      // comparison
      "no-new": 0,
      // disallow use of new operator for Function object
      "no-new-func": 0,
      // disallow use of the Object constructor
      "no-new-object": 0,
      // disallows creating new instances of String,Number, and Boolean
      "no-new-wrappers": 0,
      // disallow the use of object properties of the global object (Math and
      // JSON) as functions
      "no-obj-calls": 0,
      // disallow use of octal escape sequences in string literals, such as
      // var foo = "Copyright \251";
      "no-octal-escape": 0,
      // disallow use of undefined when initializing variables
      "no-undef-init": 0,
      // disallow usage of expressions in statement position
      "no-unused-expressions": 0,
      // disallow use of void operator
      "no-void": 0,
      // disallow wrapping of non-IIFE statements in parens
      "no-wrap-func": 0,
      // require assignment operator shorthand where possible or prohibit it
      // entirely
      "operator-assignment": 0,
      // enforce operators to be placed before or after line breaks
      "operator-linebreak": 0
    }
  }