.eslintrc

{
  // http://eslint.org/docs/rules/
  "parserOptions": {
    "ecmaVersion": 7,
    "sourceType": "module",
    "ecmaFeatures": {
      "arrowFunctions": true,
      "binaryLiterals": true,
      "blockBindings": true,
      "classes": true,
      "defaultParams": true,
      "destructuring": true,
      "forOf": true,
      "generators": true,
      "modules": true,
      "objectLiteralComputedProperties": true,
      "objectLiteralDuplicateProperties": true,
      "objectLiteralShorthandMethods": true,
      "objectLiteralShorthandProperties": true,
      "octalLiterals": true,
      "regexUFlag": true,
      "regexYFlag": true,
      "spread": true,
      "superInFunctions": true,
      "templateStrings": true,
      "unicodeCodePointEscapes": true,
      "globalReturn": true,
      "jsx": true
    }
  },
  "settings": {
    "import/extensions": [".js"],
    "import/resolve": { "extensions": [ ".js"] }
  },
  "env": {
    "browser": false,     // browser global variables
    "node": false,        // Node.js global variables and Node.js-specific rules
    "amd": false,         // defines require() and define() as global variables as per the amd spec
    "mocha": false,       // adds all of the Mocha testing global variables
    "jasmine": false,     // adds all of the Jasmine testing global variables for version 1.3 and 2.0
    "phantomjs": false,   // phantomjs global variables
    "jquery": false,      // jquery global variables
    "prototypejs": false, // prototypejs global variables
    "shelljs": false,     // shelljs global variables
    "es6": true           // enable all ECMAScript 6 features except for modules
  },

  "globals": {
    "$": true,
    "Blob": true,
    "FormData": true,
    "ObjectObserver": true,
    "Promise": true,
    "_": true,
    "afterEach": true,
    "beforeEach": true,
    "browser": true,
    "console": true,
    "describe": true,
    "document": true,
    "expect": true,
    "fetch": true,
    "global": true,
    "it": true,
    "jasmine": true,
    "jest": true,
    "jsPlumb": true,
    "location": true,
    "mocha": true,
    "module": true,
    "moment": true,
    "process": true,
    "setTimeout": true,
    "window": true,
    "__resourceQuery": true
  },

  "plugins": ["babel", "import"],
  "parser": "babel-eslint",
  "rules": {
    ////////// Possible Errors //////////

    "no-cond-assign": 2,                  // disallow assignment in conditional expressions
    "no-console": 2,                      // disallow use of console (off by default in the node environment)
    "no-constant-condition": 0,           // disallow use of constant expressions in conditions
    "no-control-regex": 2,                // disallow control characters in regular expressions
    "no-debugger": 2,                     // disallow use of debugger
    "no-dupe-args": 2,                    // disallow duplicate arguments in functions
    "no-dupe-keys": 2,                    // disallow duplicate keys when creating object literals
    "no-duplicate-case": 2,               // disallow a duplicate case label
    "no-empty-character-class": 2,        // disallow the use of empty character classes in regular expressions
    "no-empty": 2,                        // disallow empty statements
    "no-ex-assign": 2,                    // disallow assigning to the exception in a catch block
    "no-extra-boolean-cast": 2,           // disallow double-negation boolean casts in a boolean context
    "no-extra-parens": ["error", "all"],  // disallow unnecessary parentheses (off by default)
    "no-extra-semi": 2,                   // disallow unnecessary semicolons
    "no-func-assign": 2,                  // disallow overwriting functions written as function declarations
    "no-inner-declarations": 2,           // disallow function or variable declarations in nested blocks
    "no-invalid-regexp": 2,               // disallow invalid regular expression strings in the RegExp constructor
    "no-irregular-whitespace": 2,         // disallow irregular whitespace outside of strings and comments
    "no-negated-in-lhs": 2,               // disallow negation of the left operand of an in expression
    "no-obj-calls": 2,                    // disallow the use of object properties of the global object (Math and JSON) as functions
    "no-prototype-builtins": 2,           // disallow calling some Object.prototype methods directly on objects
    "no-regex-spaces": 2,                 // disallow multiple spaces in a regular expression literal
    "no-sparse-arrays": 2,                // disallow sparse arrays
    "no-unexpected-multiline": 2,         // Avoid code that looks like two expressions but is actually one (off by default)
    "no-unreachable": 2,                  // disallow unreachable statements after a return, throw, continue, or break statement
    "no-unsafe-finally": 2,               // disallow control flow statements in finally blocks
    "use-isnan": 2,                       // disallow comparisons with the value NaN
    "valid-typeof": 2,                    // Ensure that the results of typeof are compared against a valid string


    ////////// Best Practices //////////

    "accessor-pairs": 0,                // enforces getter/setter pairs in objects (off by default)
    "array-callback-return": 2,         // enforce return statements in callbacks of array methods
    "block-scoped-var": 0,              // treat var statements as if they were block scoped (off by default)
    "consistent-return": 2,             // require return statements to either always or never specify values
    "curly": 2,                         // specify curly brace conventions for all control statements
    "default-case": 2,                  // require default case in switch statements (off by default)
    "dot-location": [2, "property"],    // enforces consistent newlines before or after dots (off by default)
    "dot-notation": 2,                  // encourages use of dot notation whenever possible
    "eqeqeq": 2,                        // require the use of === and !==
    "guard-for-in": 0,                  // make sure for-in loops have an if statement (off by default)
    "no-alert": 2,                      // disallow the use of alert, confirm, and prompt
    "no-caller": 2,                     // disallow use of arguments.caller or arguments.callee
    "no-case-declarations": 2,          // disallow lexical declarations in case clauses
    "no-div-regex": 2,                  // disallow division operators explicitly at beginning of regular expression (off by default)
    "no-else-return": 2,                // disallow else after a return in an if (off by default)
    "no-empty-function": 2,             // disallow empty functions
    "no-empty-pattern": 2,              // disallow empty destructuring patterns
    "no-eq-null": 2,                    // disallow comparisons to null without a type-checking operator (off by default)
    "no-eval": 2,                       // disallow use of eval()
    "no-extend-native": 2,              // disallow adding to native types
    "no-extra-bind": 2,                 // disallow unnecessary function binding
    "no-extra-label": 2,                // disallow unnecessary labels
    "no-fallthrough": 2,                // disallow fallthrough of case statements
    "no-floating-decimal": 2,           // disallow the use of leading or trailing decimal points in numeric literals (off by default)
    "no-implicit-coercion": 2,          // disallow shorthand type conversions
    "no-implicit-globals": 2,           // disallow var and named function declarations in the global scope
    "no-implied-eval": 2,               // disallow use of eval()-like methods
    "no-invalid-this": 0,               // disallow this keywords outside of classes or class-like objects
    "no-iterator": 2,                   // disallow usage of __iterator__ property
    "no-labels": 2,                     // disallow use of labeled statements
    "no-lone-blocks": 2,                // disallow unnecessary nested blocks
    "no-loop-func": 2,                  // disallow creation of functions within loops
    "no-magic-numbers": 0,              // disallow magic numbers
    "no-multi-spaces": 2,               // disallow use of multiple spaces
    "no-multi-str": 2,                  // disallow use of multiline strings
    "no-native-reassign": 2,            // disallow reassignments of native objects
    "no-new-func": 2,                   // disallow use of new operator for Function object
    "no-new-wrappers": 2,               // disallows creating new instances of String, Number, and Boolean
    "no-new": 2,                        // disallow use of new operator when not part of the assignment or comparison
    "no-octal-escape": 2,               // disallow use of octal escape sequences in string literals, such as var foo = "Copyright \251";
    "no-octal": 2,                      // disallow use of octal literals
    "no-param-reassign": 2,             // disallow reassignment of function parameters (off by default)
    "no-proto": 2,                      // disallow usage of __proto__ property
    "no-redeclare": 2,                  // disallow declaring the same variable more then once
    "no-return-assign": 2,              // disallow use of assignment in return statement
    "no-script-url": 2,                 // disallow use of javascript: urls
    "no-self-assign": 2,                // disallow assignments where both sides are exactly the same
    "no-self-compare": 2,               // disallow comparisons where both sides are exactly the same (off by default)
    "no-sequences": 2,                  // disallow use of comma operator
    "no-throw-literal": 2,              // restrict what can be thrown as an exception (off by default)
    "no-unmodified-loop-condition": 2,  // disallow unmodified loop conditions
    "no-unused-expressions": 2,         // disallow usage of expressions in statement position
    "no-unused-labels": 2,              // disallow unused labels
    "no-useless-call": 2,               // disallow unnecessary calls to .call() and .apply()
    "no-useless-concat": 2,             // disallow unnecessary concatenation of literals or template literals
    "no-useless-escape": 2,             // disallow unnecessary escape characters
    "no-void": 2,                       // disallow use of void operator (off by default)
    "no-warning-comments": 2,           // disallow usage of configurable warning terms in comments, e.g. TODO or FIXME (off by default)
    "no-with": 2,                       // disallow use of the with statement
    "radix": 2,                         // require use of the second argument for parseInt() (off by default)
    "sort-keys": [2, "asc", {"caseSensitive": false, "natural": false}],
    "vars-on-top": 2,                   // requires to declare all vars on top of their containing scope (off by default)
    "wrap-iife": 2,                     // require immediate function invocation to be wrapped in parentheses (off by default)
    "yoda": 2,                          // require or disallow Yoda conditions


    ////////// Strict Mode //////////

    "strict": [2, "global"],    // controls location of Use Strict Directives


    ////////// Variables //////////

    "init-declarations": 0,           // require or disallow initialization in var declarations
    "no-catch-shadow": 2,             // disallow the catch clause parameter name being the same as a variable in the outer scope (off by default in the node environment)
    "no-delete-var": 2,               // disallow deletion of variables
    "no-label-var": 2,                // disallow labels that share a name with a variable
    "no-restricted-globals": 2,       // disallow specified global variables
    "no-shadow-restricted-names": 2,  // disallow shadowing of names such as arguments
    "no-shadow": 2,                   // disallow declaration of variables already declared in the outer scope
    "no-undef-init": 2,               // disallow use of undefined when initializing variables
    "no-undef": 2,                    // disallow use of undeclared variables unless mentioned in a /*global */ block
    "no-undefined": 0,                // disallow use of undefined variable (off by default)
    "no-unused-vars": 2,              // disallow declaration of variables that are not used in the code
    "no-use-before-define": 2,        // disallow use of variables before they are defined


    ////////// Node.js and CommonJs //////////

    "callback-return": 2,       // require return statements after callbacks
    "global-require": 2,        // require require() calls to be placed at top-level module scope
    "handle-callback-err": 2,   // enforces error handling in callbacks (off by default) (on by default in the node environment)
    "no-mixed-requires": 2,     // disallow mixing regular variable and require declarations (off by default) (on by default in the node environment)
    "no-new-require": 2,        // disallow use of new operator with the require function (off by default) (on by default in the node environment)
    "no-path-concat": 2,        // disallow string concatenation with __dirname and __filename (off by default) (on by default in the node environment)
    "no-process-exit": 2,       // disallow process.exit() (on by default in the node environment)
    "no-restricted-modules": 0, // restrict usage of specified node modules (off by default)
    "no-sync": 0,               // disallow use of synchronous methods (off by default)


    ////////// Stylistic Issues //////////

    "array-bracket-spacing": 2,                                                     // enforce spacing inside array brackets (off by default)
    "block-spacing": 2,                                                             // enforce consistent spacing inside single-line blocks
    "brace-style": [2, "1tbs"],                                                     // enforce one true brace style (off by default)
    "camelcase": 2,                                                                 // require camel case names
    "comma-dangle": 2,                                                              // disallow trailing commas in object literals
    "comma-spacing": [2, {"before": false, "after": true}],                         // enforce spacing before and after comma
    "comma-style": [2, "last"],                                                     // enforce one true comma style (off by default)
    "computed-property-spacing": [2, "never"],                                      // require or disallow padding inside computed properties (off by default)
    "consistent-this": 2,                                                           // enforces consistent naming when capturing the current execution context (off by default)
    "eol-last": 0,                                                                  // enforce newline at the end of file, with no multiple empty lines
    "func-names": [2, "never"],                                                     // require function expressions to have a name (off by default)
    "func-style": [2, "declaration", {"allowArrowFunctions": true}],                // enforces use of function declarations or expressions (off by default)
    "id-blacklist": 0,                                                              // disallow specified identifiers
    "id-length": ["error", { "min": 2, "exceptions": ["_", "$", "Q", "R", "RU"] }], // enforce minimum and maximum identifier lengths
    "id-match": 0,                                                                  // require identifiers to match a specified regular expression
    "indent": ["error", 4, {"SwitchCase": 1, "MemberExpression": 1}],               // this option sets a specific tab width for your code (off by default)
    "jsx-quotes": [2, "prefer-double"],                                             // enforce the consistent use of either double or single quotes in JSX attributes
    "key-spacing": 2,                                                               // enforces spacing between keys and values in object literal properties
    "keyword-spacing": 2,                                                           // enforce consistent spacing before and after keywords
    "linebreak-style": 0,                                                           // disallow mixed 'LF' and 'CRLF' as linebreaks (off by default)
    "lines-around-comment": [2, {"beforeBlockComment": false}],                     // enforces empty lines around comments (off by default)
    "max-depth": [2, {"max": 2}],                                                   // enforce a maximum depth that blocks can be nested
    "max-len": [2, {"code": 120}],                                                  // enforce a maximum line length
    "max-lines": [2, {"max": 300}],                                                 // enforce a maximum number of lines per file
    "max-nested-callbacks": 2,                                                      // specify the maximum depth callbacks can be nested (off by default)
    "max-params": 0,                                                                // enforce a maximum number of parameters in function definitions
    "max-statements-per-line": 2,                                                   // enforce a maximum number of statements allowed per line
    "max-statements": 0,                                                            // enforce a maximum number of statements allowed in function blocks
    "multiline-ternary": 0,                                                         // enforce newlines between operands of ternary expressions
    "new-cap": 2,                                                                   // require a capital letter for constructors
    "new-parens": 2,                                                                // disallow the omission of parentheses when invoking a constructor with no arguments
    "newline-after-var": 0,                                                         // allow/disallow an empty newline after var statement (off by default)
    "newline-before-return": 0,                                                     // require an empty line before return statements
    "newline-per-chained-call": [2, {"ignoreChainWithDepth": 3}],                   // require a newline after each call in a method chain
    "no-array-constructor": 2,                                                      // disallow use of the Array constructor
    "no-bitwise": 2,                                                                // disallow bitwise operators
    "no-continue": 2,                                                               // disallow use of the continue statement (off by default)
    "no-inline-comments": 2,                                                        // disallow comments inline after code (off by default)
    "no-lonely-if": 2,                                                              // disallow if as the only statement in an else block (off by default)
    "no-mixed-operators": 0,                                                        // disallow mixed binary operators
    "no-mixed-spaces-and-tabs": 2,                                                  // disallow mixed spaces and tabs for indentation
    "no-multiple-empty-lines": [2, {"max": 1}],                                     // disallow multiple empty lines (off by default)
    "no-negated-condition": 0,                                                      // disallow negated conditions
    "no-nested-ternary": 2,                                                         // disallow nested ternary expressions (off by default)
    "no-new-object": 2,                                                             // disallow use of the Object constructor
    "no-plusplus": 2,                                                               // disallow the unary operators ++ and --
    "no-restricted-syntax": 2,                                                      // disallow specified syntax
    "no-spaced-func": 2,                                                            // disallow space between function identifier and application
    "no-tabs": 0,                                                                   // Disallow tabs in file
    "no-ternary": 0,                                                                // disallow the use of ternary operators (off by default)
    "no-trailing-spaces": 2,                                                        // disallow trailing whitespace at the end of lines
    "no-underscore-dangle": 0,                                                      // disallow dangling underscores in identifiers
    "no-unneeded-ternary": 2,                                                       // disallow ternary operators when simpler alternatives exist
    "no-whitespace-before-property": 2,                                             // disallow whitespace before properties
    "object-curly-newline": [2, {
        "multiline": true,
        "minProperties": 5
    }],                                                                             // enforce consistent line breaks inside braces
    "object-curly-spacing": 2,                                                      // enforce consistent spacing inside braces
    "object-property-newline": [2, { "allowMultiplePropertiesPerLine": true }],     // enforce placing object properties on separate lines
    "one-var-declaration-per-line": 2,                                              // require or disallow newlines around var declarations
    "one-var": 0,                                                                   // allow just one var statement per function (off by default)
    "operator-assignment": 2,                                                       // require assignment operator shorthand where possible or prohibit it entirely (off by default)
    "operator-linebreak": [2, "after"],                                             // enforce operators to be placed before or after line breaks (off by default)
    "padded-blocks": [2, "never"],                                                  // enforce padding within blocks (off by default)
    "quote-props": [2, "consistent-as-needed"],                                     // require quotes around object literal property names (off by default)
    "quotes": [2, "single", "avoid-escape"],                                        // specify whether double or single quotes should be used
    "require-jsdoc": 0,                                                             // require JSDoc comments
    "semi-spacing": 2,                                                              // enforce spacing before and after semicolons
    "semi": 2,                                                                      // require or disallow use of semicolons instead of ASI
    "sort-vars": 0,                                                                 // sort variables within the same declaration block (off by default)
    "space-before-blocks": 2,                                                       // require or disallow space before blocks (off by default)
    "space-before-function-paren": [2, "never"],                                    // require or disallow space before function opening parenthesis (off by default)
    "space-in-parens": [2, "never"],                                                // require or disallow spaces inside parentheses (off by default)
    "space-infix-ops": 2,                                                           // require spaces around operators
    "space-unary-ops": 2,                                                           // require or disallow spaces before/after unary operators (words on by default, nonwords off by default)
    "spaced-comment": 2,                                                            // require or disallow a space immediately following the // or /* in a comment (off by default)
    "unicode-bom": 2,                                                               // require or disallow Unicode byte order mark (BOM)
    "wrap-regex": 2,                                                                // require regex literals to be wrapped in parentheses (off by default)

    ////////// ECMAScript 6 //////////

    "arrow-body-style": [2, "as-needed"],                                             // require braces around arrow function bodies
    "arrow-parens": ["error", "always"],                                              // Require parens in arrow function arguments
    "arrow-spacing": 2,                                                               // enforce consistent spacing before and after the arrow in arrow functions
    "constructor-super": 0,                                                           // verify super() callings in constructors (off by default)
    "generator-star-spacing": ["error", {"before": false, "after": true}],            // enforce the spacing around the * in generator functions (off by default)
    "no-class-assign": 2,                                                             // disallow reassigning class members
    "no-confusing-arrow": 0,                                                          // disallow arrow functions where they could be confused with comparisons
    "no-const-assign": 2,                                                             // disallow reassigning const variables
    "no-dupe-class-members": 2,                                                       // disallow duplicate class members
    "no-duplicate-imports": 2,                                                        // disallow duplicate module imports
    "no-new-symbol": 2,                                                               // disallow new operators with the Symbol object
    "no-restricted-imports": 2,                                                       // disallow specified modules when loaded by import
    "no-this-before-super": 2,                                                        // disallow to use this/super before super() calling in constructors (off by default)
    "no-useless-computed-key": 2,                                                     // disallow unnecessary computed property keys in object literals
    "no-useless-constructor": 2,                                                      // disallow unnecessary constructors
    "no-useless-rename": 2,                                                           // disallow renaming import, export, and destructured assignments to the same name
    "no-var": 2,                                                                      // require let or const instead of var (off by default)
    "object-shorthand": 0,                                                            // require method and property shorthand syntax for object literals (off by default)
    "prefer-arrow-callback": 2,                                                       // require arrow functions as callbacks
    "prefer-const": 2,                                                                // suggest using of const declaration for variables that are never modified after declared (off by default)
    "prefer-rest-params": 2,                                                          // require rest parameters instead of arguments
    "prefer-spread": 2,                                                               // require spread operators instead of .apply()
    "prefer-template": 2,                                                             // require template literals instead of string concatenation
    "require-yield": 2,                                                               // require generator functions to contain yield
    "rest-spread-spacing": 2,                                                         // enforce spacing between rest and spread operators and their expressions
    "sort-imports": 0,                                                                // enforce sorted import declarations within modules
    "template-curly-spacing": 2,                                                      // require or disallow spacing around embedded expressions of template strings
    "yield-star-spacing": [2, "after"],                                               // require or disallow spacing around the * in yield* expressions

    ////////// Import plugin ///////////
    // Static analysis
    "import/no-unresolved": [2, { "ignore": ["^[~]"] }],    // Ensure imports point to a file/module that can be resolved
    "import/named": 2,                                      // Ensure named imports correspond to a named export in the remote file
    "import/default": 0,                                    // Ensure a default export is present, given a default import
    "import/namespace": 2,                                  // Ensure imported namespaces contain dereferenced properties as they are dereferenced
    "import/no-restricted-paths": 2,                        // Restrict which files can be imported in a given folder
    "import/no-absolute-path": 2,                           // Forbid import of modules using absolute paths
    "import/no-dynamic-require": 2,                         // Forbid require() calls with expressions
    "import/no-internal-modules": 0,                        // Use this rule to prevent importing the submodules of other modules
    "import/no-webpack-loader-syntax": 2,                   // Forbid Webpack loader syntax in imports

    // Helpful warnings
    "import/export": 2,                                     // Report any invalid exports, i.e. re-export of the same name
    "import/no-named-as-default": 2,                        // Report use of exported name as identifier of default export
    "import/no-named-as-default-member": 2,                 // Report use of exported name as property of default export
    "import/no-deprecated": 2,                              // Report imported names marked with @deprecated documentation tag
    "import/no-extraneous-dependencies": 2,                 // Forbid the use of extraneous packages
    "import/no-mutable-exports": 2,                         // Forbid the use of mutable exports with var or let

    // Module systems
    "import/unambiguous": 0,                                // Warn if a module could be mistakenly parsed as a script by a consumer leveraging Unambiguous JavaScript Grammar to determine correct parsing goal.
    "import/no-commonjs": 2,                                // Report CommonJS require calls and module.exports or exports.*
    "import/no-amd": 2,                                     // Report AMD require and define calls

    // Style guide
    "import/first": 2,                                      // Ensure all imports appear before other statements
    "import/no-duplicates": 2,                              // Report repeated import of the same module in multiple places
    "import/no-namespace": 0,                               // Report namespace imports
    "import/extensions": [2, "never", { "svg": "always" }], // Ensure consistent use of file extension within the import path
    "import/order": 2,                                      // Enforce a convention in module import order
    "import/newline-after-import": 2,                       // Enforce a newline after import statements
    "import/prefer-default-export": 0,                      // Prefer a default export if module exports a single name
    "import/max-dependencies": 0,                           // Forbid modules to have too many dependencies (import or require statements).
    "import/no-unassigned-import": 0,                       // With both CommonJS' require and the ES6 modules' import syntax, it is possible to import a module but not to use its result. This can be done explicitly by not assigning the module to as variable.
    "import/no-named-default": 0                            // Reports use of a default export as a locally named import.
  }
}