.eslintrc.json

{
  "env": {
    "browser": true,
    "node": true,
    "es6": true,
    "mocha": true
  },
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": {
      "impliedStrict": true,
      "experimentalObjectRestSpread": true
    }
  },
  "globals": {},
  "rules": {
    /* Possible Errors */

    // disallow assignment operators in conditional expressions
    "no-cond-assign": 2,

    // disallow the use of console
    "no-console": 1,

    // disallow constant expressions in conditions
    "no-constant-condition": 2,

    // disallow the use of debugger
    "no-debugger": 2,

    // disallow duplicate arguments in function definitions
    "no-dupe-args": 2,

    // disallow duplicate keys in object literals
    "no-dupe-keys": 2,

    // disallow duplicate case labels
    "no-duplicate-case": 2,

    // disallow empty character classes in regular expressions
    "no-empty-character-class": 2,

    // disallow empty block statements
    "no-empty": [1, {"allowEmptyCatch": true}],

    // disallow reassigning exceptions in catch clauses
    "no-ex-assign": 2,

    // disallow unnecessary boolean casts
    "no-extra-boolean-cast": 2,

    // disallow unnecessary parentheses
    "no-extra-parens": 2,

    // disallow unnecessary semicolons
    "no-extra-semi": 2,

    // disallow reassigning function declarations
    "no-func-assign": 2,

    // disallow function or var declarations in nested blocks
    "no-inner-declarations": [2, "both"],

    // disallow invalid regular expression strings in RegExp constructors
    "no-invalid-regexp": 2,

    // disallow irregular whitespace outside of strings and comments
    "no-irregular-whitespace": [2, {"skipStrings": true, "skipComments": true, "skipRegExps": true, "skipTemplates": true}],

    // disallow negating the left operand in in expressions
    "no-negated-in-lhs": 2,

    // disallow calling global object properties as functions
    "no-obj-calls": 2,

    // disallow use of Object.prototypes builtins directly
    "no-prototype-builtins": 2,

    //disallow multiple spaces in regular expression literals
    "no-regex-spaces": 2,

    // disallow sparse arrays
    "no-sparse-arrays": 1,

    // disallow confusing multiline expressions
    "no-unexpected-multiline": 1,

    // disallow unreachable code after return, throw, continue, and break statements
    "no-unreachable": 2,

    // disallow control flow statements in finally blocks
    "no-unsafe-finally": 1,

    // require calls to isNaN() when checking for NaN
    "use-isnan": 2,

    // enforce valid JSDoc comments
    "valid-jsdoc": 1,

    // enforce comparing typeof expressions against valid strings
    "valid-typeof": 2,

    /* Best Practices */

    // Enforces getter/setter pairs in objects
    "accessor-pairs": 1,

    // Enforces return statements in callbacks of array’s methods
    "array-callback-return": 1,

    // enforce the use of variables within the scope they are defined
    "block-scoped-var": 1,

    // enforce consistent brace style for all control statements
    "curly": 1,

    // require default cases in switch statements
    "default-case": 1,

    // enforce consistent newlines before and after dots
    "dot-notation": 1,

    // require the use of === and !==
    "eqeqeq": [2, "allow-null"],

    // require for-in loops to include an if statement
    "guard-for-in": 1,

    // disallow the use of alert, confirm, and prompt
    "no-alert": 1,

    // disallow the use of arguments.caller or arguments.callee
    "no-caller": 2,

    // disallow the use of eval()
    "no-eval": 2,

    // disallow extending native types
    "no-extend-native": 1,

    // disallow unnecessary calls to .bind()
    "no-extra-bind": 1,

    // disallow leading or trailing decimal points in numeric literals
    "no-floating-decimal": 2,

    // disallow var and named function declarations in the global scope
    "no-implicit-globals": 1,

    // disallow the use of eval()-like methods
    "no-implied-eval": 2,

    // disallow unnecessary nested blocks
    "no-lone-blocks": 1,

    // disallow function declarations and expressions inside loop statements
    "no-loop-func": 1,

    // disallow multiple spaces
    "no-multi-spaces": 1,

    // disallow var redeclaration
    "no-redeclare": [2, {"builtinGlobals": true}],

    // disallow comma operators
    "no-sequences": 1,

    // require var declarations be placed at the top of their containing scope
    "vars-on-top": 1,

    // require parentheses around immediate function invocations
    "wrap-iife": 1,

    // require or disallow “Yoda” conditions
    "yoda": 1,

    /* Strict Mode */
    "strict": [1, "function"],

    /* Variables */

    // disallow deleting variables
    "no-delete-var": 2,

    // disallow specified global variables
    "no-restricted-globals": 2,

    // disallow unused variables
    "no-unused-vars": 1,

    // disallow the use of variables before they are defined
    "no-use-before-define": 2,

    // Disallow Use of undefined Variable
    "no-undef": 2,

    // disallow initializing variables to undefined
    "no-undef-init": 1,

    // disallow the use of undefined as an identifier
    "no-undefined": 1,

    // disallow var declarations from shadowing variables in the outer scope
    "no-shadow": [2, {"hoist": "functions"}],

    /* Stylistic Issues */

    // enforce consistent spacing inside array brackets
    "array-bracket-spacing": [1, "never"],

    // enforce consistent spacing inside single-line blocks
    "block-spacing": [1, "never"],

    // enforce consistent brace style for blocks
    "brace-style": [1, "1tbs", {"allowSingleLine": true}],

    // require or disallow trailing commas,
    "comma-dangle": 1,

    // enforce consistent spacing before and after commas
    "comma-spacing": [1, {"before": false, "after": true}],

    // enforce consistent comma style
    "comma-style": [1, "last"],

    // enforce consistent spacing inside computed property brackets
    "computed-property-spacing": [1, "never"],

    // enforce consistent naming when capturing the current execution context
    "consistent-this": [1, "that"],

    // enforce at least one newline at the end of files
    "eol-last": 1,

    // disallow specified identifiers
    "id-blacklist": [1],

    // enforce consistent indentation
    "indent": [1, 2, {"SwitchCase": 1}],

    // enforce consistent spacing between keys and values in object literal properties
    "key-spacing": [1, {"afterColon": true}],

    // enforce consistent spacing before and after keywords
    "keyword-spacing": 1,

    // enforce a maximum line length
    "max-len": [1, 100, 2, {"ignoreComments": true, "ignoreTrailingComments": true, "ignoreUrls": true, "ignoreStrings": true, "ignoreTemplateLiterals": true}],

    // enforce a maximum number of parameters in function definitions
    "max-params": [1, 3],

    // require constructor function names to begin with a capital letter
    "new-cap": 1,

    // require parentheses when invoking a constructor with no arguments
    "new-parens": 1,

    // disallow mixed spaces and tabs for indentation
    "no-mixed-spaces-and-tabs": 1,

    // disallow multiple empty lines
    "no-multiple-empty-lines": [1, {"max": 1, "maxBOF": 0, "maxEOF": 1}],

    // disallow spacing between function identifiers and their applications
    "no-spaced-func": 1,

    // disallow trailing whitespace at the end of lines
    "no-trailing-spaces": 1,

    // disallow ternary operators when simpler alternatives exist
    "no-unneeded-ternary": 1,

    // disallow whitespace before properties
    "no-whitespace-before-property": 1,

    // enforce consistent spacing inside braces
    "object-curly-spacing": [1, "never"],

    // enforce the consistent use of either backticks, double, or single quotes
    "quotes": [1, "single", {"avoidEscape": true, "allowTemplateLiterals": true}],

    // enforce consistent spacing before and after semicolons
    "semi-spacing": [1, {"before": false, "after": true}],

    // require or disallow semicolons instead of ASI
    "semi": 1,

    // enforce consistent spacing before blocks
    "space-before-blocks": 1,

    // enforce consistent spacing before function definition opening parenthesis
    "space-before-function-paren": [1, {"anonymous": "always", "named": "never"}],

    // enforce consistent spacing inside parentheses
    "space-in-parens": [1, "never"],

    // require spacing around operators
    "space-infix-ops": 1,

    // enforce consistent spacing after the // or /* in a comment
    "spaced-comment": [1, "always"],

    /* ECMAScript 6 */

    // require braces around arrow function bodies
    "arrow-body-style": [1, "as-needed"],

    // require parentheses around arrow function arguments
    "arrow-parens": [1, "as-needed"],

    // enforce consistent spacing before and after the arrow in arrow functions
    "arrow-spacing": [1, {"before": true, "after": true}],

    // require super() calls in constructors
    "constructor-super": 2,

    // enforce consistent spacing around * operators in generator functions
    "generator-star-spacing": [1, {"before": true, "after": false}],

    // disallow reassigning class members
    "no-class-assign": 2,

    // disallow arrow functions where they could be confused with comparisons
    "no-confusing-arrow": 0,

    // disallow reassigning const variables
    "no-const-assign": 2,

    // disallow duplicate class members
    "no-dupe-class-members": 1,

    // disallow duplicate module imports
    "no-duplicate-imports": [1, {"includeExports": true}],

    // disallow new operators with the Symbol object
    "no-new-symbol": 2,

    // disallow specified modules when loaded by import
    "no-restricted-imports": [2, "assert","buffer","child_process","cluster","crypto","dgram","dns","domain","events","freelist","fs","http","https","module","net","os","path","punycode","querystring","readline","repl","smalloc","stream","string_decoder","sys","timers","tls","tracing","tty","url","util","vm","zlib"],

    // disallow this/super before calling super() in constructors
    "no-this-before-super": 2,

    // disallow unnecessary computed property keys in object literals
    "no-useless-computed-key": 1,

    // disallow unnecessary constructors
    "no-useless-constructor": 1,

    // disallow renaming import, export, and destructured assignments to the same name
    "no-useless-rename": 1,

    // require let or const instead of var
    "no-var": 1,

    // require rest parameters instead of arguments
    "prefer-rest-params": 1,

    // require template literals instead of string concatenation
    "prefer-template": 1,

    // require generator functions to contain yield
    "require-yield": 2,

    // enforce spacing between rest and spread operators and their expressions
    "rest-spread-spacing": [1, "never"],

    // require or disallow spacing around embedded expressions of template strings
    "template-curly-spacing": [1, "never"],

    // require or disallow spacing around the * in yield* expressions
    "yield-star-spacing": [1, {"before": true, "after": false}]
  }
}