.eslintrc

{
  "env": {
    "browser": true,
    "node": true,
    "es6": true,
    "jest": true
  },
  "parserOptions": {
    "ecmaVersion": 8,
    "ecmaFeatures": {
      "impliedStrict": true
    }
  },
  "rules": {
    // disallow or enforce trailing commas
    "comma-dangle": [2, "never"],

    // disallow assignment in conditional expressions
    "no-cond-assign": [2, "always"],

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

    // disallow control characters in regular expressions
    "no-control-regex": 0,

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

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

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

    // disallow a duplicate case label.
    "no-duplicate-case": 2,

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

    // disallow empty statements
    "no-empty": 2,

    // disallow assigning to the exception in a catch block
    "no-ex-assign": 2,

    // disallow double-negation boolean casts in a boolean context
    "no-extra-boolean-cast": 2,

    // disallow unnecessary parentheses (off by default)
    "no-extra-parens": 2,

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

    // disallow overwriting functions written as function declarations
    "no-func-assign": 2,

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

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

    // disallow irregular whitespace outside of strings and comments
    "no-irregular-whitespace": 2,

    // disallow negation of the left operand of an in expression
    "no-negated-in-lhs": 2,

    // disallow the use of object properties of the global object (Math and JSON) as functions
    "no-obj-calls": 2,

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

    // disallow sparse arrays
    "no-sparse-arrays": 2,

    // disallow unreachable statements after a return, throw, continue, or break statement
    "no-unreachable": 2,

    // disallow comparisons with the value NaN
    "use-isnan": 2,

    // Ensure JSDoc comments are valid (off by default)
    "valid-jsdoc": 0,

    // Ensure that the results of typeof are compared against a valid string
    "valid-typeof": 2,

    // treat var statements as if they were block scoped (off by default)
    "block-scoped-var": 2,

    // specify the maximum cyclomatic complexity allowed in a program (off by default)
    "complexity": [2, 12],

    // require return statements to either always or never specify values
    "consistent-return": 2,

    // specify curly brace conventions for all control statements
    "curly": [2, "all"],

    // require default case in switch statements (off by default)
    "default-case": 2,

    // encourages use of dot notation whenever possible
    "dot-notation": [2, {"allowKeywords": true, "allowPattern": "^[a-z]+(_[a-z]+)+$"}],

    // enforces consistent newlines before or after dots (off by default)
    "dot-location": [2, "property"],

    // require the use of === and !==
    "eqeqeq": 2,

    // make sure for-in loops have an if statement (off by default)
    "guard-for-in": 0,

    // disallow the use of alert, confirm, and prompt
    "no-alert": 2,

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

    // disallow division operators explicitly at beginning of regular expression (off by default)
    "no-div-regex": 0,

    // disallow else after a return in an if (off by default)
    "no-else-return": 2,

    // disallow use of labels for anything other then loops and switches
    "no-labels": 2,

    // disallow comparisons to null without a type-checking operator (off by default)
    "no-eq-null": 2,

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

    // disallow adding to native types
    "no-extend-native": 2,

    // disallow unnecessary function binding
    "no-extra-bind": 2,

    // disallow fallthrough of case statements
    "no-fallthrough": 0,

    // disallow the use of leading or trailing decimal points in numeric literals (off by default)
    "no-floating-decimal": 2,

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

    // disallow usage of __iterator__ property
    "no-iterator": 2,

    // disallow unnecessary nested blocks
    "no-lone-blocks": 0, // useful with `let`

    // disallow creation of functions within loops
    "no-loop-func": 2,

    // disallow use of multiple spaces
    "no-multi-spaces": 2,

    // disallow use of multiline strings
    "no-multi-str": 2,

    // disallow reassignments of native objects
    "no-native-reassign": 2,

    // disallow use of new operator for Function object
    "no-new-func": 2,

    // disallows creating new instances of String,Number, and Boolean
    "no-new-wrappers": 2,

    // disallow use of new operator when not part of the assignment or comparison
    "no-new": 2,

    // disallow use of octal escape sequences in string literals, such as var foo = "Copyright \251";
    "no-octal-escape": 2,

    // disallow use of octal literals
    "no-octal": 2,

    // disallow reassignment of function parameters (off by default)
    "no-param-reassign": 0,

    // disallow use of process.env (off by default)
    "no-process-env": 2,

    // disallow usage of __proto__ property
    "no-proto": 2,

    // disallow declaring the same variable more then once
    "no-redeclare": 2,

    // disallow use of assignment in return statement
    "no-return-assign": 2,

    // disallow use of javascript: urls.
    "no-script-url": 2,

    // disallow comparisons where both sides are exactly the same (off by default)
    "no-self-compare": 2,

    // disallow use of comma operator
    "no-sequences": 2,

    // restrict what can be thrown as an exception (off by default)
    "no-throw-literal": 2,

    // disallow usage of expressions in statement position
    "no-unused-expressions": 0,

    // disallow use of void operator (off by default)
    "no-void": 2,

    // disallow usage of configurable warning terms in comments - e.g. TODO or FIXME (off by default)
    "no-warning-comments": 2,

    // disallow use of the with statement
    "no-with": 2,

    // require use of the second argument for parseInt() (off by default)
    "radix": 2,

    // requires to declare all vars on top of their containing scope (off by default)
    "vars-on-top": 0,

    // require immediate function invocation to be wrapped in parentheses (off by default)
    "wrap-iife": 2,

    // require or disallow Yoda conditions
    "yoda": [2, "never"],

    // disallow the catch clause parameter name being the same as a variable in the outer scope (off by default in the node environment)
    "no-catch-shadow": 2,

    // disallow deletion of variables
    "no-delete-var": 2,

    // disallow labels that share a name with a variable
    "no-label-var": 2,

    // disallow shadowing of names such as arguments
    "no-shadow-restricted-names": 2,

    // disallow declaration of variables already declared in the outer scope
    "no-shadow": 2,

    // disallow use of undefined when initializing variables
    "no-undef-init": 0,

    // disallow use of undeclared variables unless mentioned in a /*global */ block
    "no-undef": 2,

    // disallow use of undefined variable (off by default)
    "no-undefined": 2,

    // disallow declaration of variables that are not used in the code
    "no-unused-vars": [2, {"vars": "all", "args": "after-used"}],

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

    // enforces error handling in callbacks (off by default) (on by default in the node environment)
    "handle-callback-err": [2, "^(err|error)$"],

    // disallow mixing regular variable and require declarations (off by default) (on by default in the node environment)
    "no-mixed-requires": [2, true],

    // disallow use of new operator with the require function (off by default) (on by default in the node environment)
    "no-new-require": 2,

    // disallow string concatenation with __dirname and __filename (off by default) (on by default in the node environment)
    "no-path-concat": 2,

    // disallow process.exit() (on by default in the node environment)
    "no-process-exit": 2,

    // restrict usage of specified node modules (off by default)
    "no-restricted-modules": 0,

    // disallow use of synchronous methods (off by default)
    "no-sync": 0,

    // enforce spacing inside array brackets
    "array-bracket-spacing": [2, "never"],

    // enforce one true brace style (off by default)
    "brace-style": [2, "1tbs"],

    // require camel case names
    "camelcase": 2,

    //Strict mode directives
    "strict": [0, "never"],
    "no-global-strict": 0,

    // enforce spacing before and after comma
    "comma-spacing": [2, {"before": false, "after": true}],

    // enforce one true comma style (off by default)
    "comma-style": [2, "last"],

    // enforces consistent naming when capturing the current execution context (off by default)
    "consistent-this": 2,

    // enforce newline at the end of file, with no multiple empty lines
    "eol-last": 2,

    // require function expressions to have a name (off by default)
    "func-names": 2,

    // enforces use of function declarations or expressions (off by default)
    "func-style": 0, // cannot activate as it breaks `export function myFunc`

    // this option sets a specific tab width for your code (off by default)
    "indent": [2, 2],

    // enforces spacing between keys and values in object literal properties
    "key-spacing": [2, {"beforeColon": false, "afterColon": true}],

    // disallow mixed 'LF' and 'CRLF' as linebreaks (off by default)
    "linebreak-style": [2, "unix"],

    // specify the maximum depth callbacks can be nested (off by default)
    "max-nested-callbacks": [2, 4],

    // require a capital letter for constructors
    "new-cap": 2,

    // disallow the omission of parentheses when invoking a constructor with no arguments
    "new-parens": 2,

    // allow/disallow an empty newline after var statement (off by default)
    "newline-after-var": [2, "always"],

    // disallow use of the Array constructor
    "no-array-constructor": 2,

    // disallow use of the continue statement (off by default)
    "no-continue": 0,

    // disallow comments inline after code (off by default)
    "no-inline-comments": 0,

    // disallow if as the only statement in an else block (off by default)
    "no-lonely-if": 2,

    // disallow mixed spaces and tabs for indentation
    "no-mixed-spaces-and-tabs": 2,

    // disallow multiple empty lines (off by default)
    "no-multiple-empty-lines": [2, {"max": 1}],

    // disallow nested ternary expressions (off by default)
    "no-nested-ternary": 2,

    // disallow use of the Object constructor
    "no-new-object": 2,

    // disallow space between function identifier and application
    "no-spaced-func": 0,

    // disallow the use of ternary operators (off by default)
    "no-ternary": 0,

    // disallow trailing whitespace at the end of lines
    "no-trailing-spaces": 2,

    // disallow dangling underscores in identifiers
    "no-underscore-dangle": 2,

    // disallow the use of Boolean literals in conditional expressions (off by default)
    "no-unneeded-ternary": 2,

    // require or disallow padding inside curly braces
    "object-curly-spacing": [2, "never"],

    // allow or disallow one variable declaration per function (off by default)
    "one-var": 0,

    // require assignment operator shorthand where possible or prohibit it entirely (off by default)
    "operator-assignment": [2, "always"],

    // enforce operators to be placed before or after line breaks (off by default)
    "operator-linebreak": [2, "before"],

    // enforce padding within blocks (off by default)
    "padded-blocks": [2, "never"],

    // require quotes around object literal property names (off by default)
    "quote-props": [2, "always"],

    // specify whether backticks, double or single quotes should be used
    "quotes": [2, "single"],

    // enforce spacing before and after semicolons
    "semi-spacing": [2, {"before": false, "after": true}],

    // require or disallow use of semicolons instead of ASI
    "semi": [2, "always"],

    // sort variables within the same declaration block (off by default)
    "sort-vars": 2,

    // require a space after certain keywords (off by default)
    "keyword-spacing": 2,

    // require or disallow space before blocks (off by default)
    "space-before-blocks": [2, "always"],

    // require or disallow space before function opening parenthesis (off by default)
    "space-before-function-paren": [2, "always"],

    // require or disallow spaces inside parentheses (off by default)
    "space-in-parens": [2, "never"],

    // require spaces around operators
    "space-infix-ops": [2, {"int32Hint": false}],

    // Require or disallow spaces before/after unary operators (words on by default, nonwords off by default)
    "space-unary-ops": [2, {"words": true, "nonwords": true, "overrides": {
      "++": false,
      "--": false,
      "+=": false,
      "-=": false
    }}],

    // require or disallow a space immediately following the // in a line comment (off by default)
    "spaced-line-comment": 0,

    // require regex literals to be wrapped in parentheses (off by default)
    "wrap-regex": 2,

    // Limit Maximum Number of Parameters
    "max-params": [2, 5]
  }
}