.eslintrc

{
    "env": {
        "browser": true,
        "es6": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
        "sourceType": "module"
    },
    "globals": {
        "require": false,
        "module": false
    },
    "rules": {
        // These rules relate to possible syntax or logic errors in JavaScript code:
        
        // disallow assignment operators in conditional expressions.
        "no-cond-assign": "error",
        // disallow the use of console.
        "no-console": "warn",
        // disallow constant expressions in conditions.
        "no-constant-condition": "error",
        // disallow control characters in regular expressions.
        "no-control-regex": "error",
        // disallow the use of debugger.
        "no-debugger": "warn",
        // disallow duplicate arguments in function definitions.
        "no-dupe-args": "error",
        // disallow duplicate keys in object literals.
        "no-dupe-keys": "error",
        // disallow duplicate case labels.
        "no-duplicate-case": "error",
        // disallow empty block statements.
        "no-empty": "error",
        // disallow empty character classes in regular expressions.
        "no-empty-character-class": "error",
        // disallow reassigning exceptions in catch clauses.
        "no-ex-assign": "error",
        // disallow unnecessary boolean casts.
        "no-extra-boolean-cast": "error",
        // disallow unnecessary parentheses.
        "no-extra-parens": "error",
        // disallow unnecessary semicolons.
        "no-extra-semi": "error",
        // disallow reassigning function declarations.
        "no-func-assign": "error",
        // disallow function or var declarations in nested blocks.
        "no-inner-declarations": "error",
        // disallow invalid regular expression strings in RegExp constructors.
        "no-invalid-regexp": "error",
        // disallow irregular whitespace outside of strings and comments.
        "no-irregular-whitespace": "error",
        // disallow negating the left operand in in expressions.
        "no-negated-in-lhs": "error",
        // disallow calling global object properties as functions.
        "no-obj-calls": "error",
        // disallow use of Object.prototypes builtins directly.
        "no-prototype-builtins": "error",
        // disallow multiple spaces in regular expression literals.
        "no-regex-spaces": "error",
        // disallow sparse arrays.
        "no-sparse-arrays": "error",
        // disallow confusing multiline expressions.
        "no-unexpected-multiline": "error",
        // disallow unreachable code after return, throw, continue, and break statements.
        "no-unreachable": "error",
        // disallow control flow statements in finally blocks.
        "no-unsafe-finally": "error",
        // require calls to isNaN() when checking for NaN.
        "use-isnan": "error",
        // enforce valid JSDoc comments.
        "valid-jsdoc": "error",
        // enforce comparing typeof expressions against valid strings.
        "valid-typeof": "error",
        
        
        // These rules relate to better ways of doing things to help you avoid problems:
        
        // enforce getter and setter pairs in objects.
        "accessor-pairs": "error",
        // enforce return statements in callbacks of array methods.
        "array-callback-return": "error",
        // enforce the use of variables within the scope they are defined.
        "block-scoped-var": "error",
        // enforce a maximum cyclomatic complexity allowed in a program.
        "complexity": "off",
        // require return statements to either always or never specify values.
        "consistent-return": "error",
        // enforce consistent brace style for all control statements.
        "curly": "error",
        // require default cases in switch statements.
        "default-case": "error",
        // enforce consistent newlines before and after dots.
        "dot-location": [
            "error",
            "property"
        ],
        // enforce dot notation whenever possible.
        "dot-notation": "error",
        // require the use of === and !==.
        "eqeqeq": "error",
        // require for-in loops to include an if statement.
        "guard-for-in": "error",
        // disallow the use of alert, confirm, and prompt.
        "no-alert": "error",
        // disallow the use of arguments.caller or arguments.callee.
        "no-caller": "error",
        // disallow lexical declarations in case clauses.
        "no-case-declarations": "error",
        // disallow division operators explicitly at the beginning of regular expressions.
        "no-div-regex": "error",
        // disallow else blocks after return statements in if statements.
        "no-else-return": "off",
        // disallow empty functions.
        "no-empty-function": "error",
        // disallow empty destructuring patterns.
        "no-empty-pattern": "error",
        // disallow null comparisons without type-checking operators.
        "no-eq-null": "error",
        // disallow the use of eval().
        "no-eval": "error",
        // disallow extending native types.
        "no-extend-native": "error",
        // disallow unnecessary calls to .bind().
        "no-extra-bind": "error",
        // disallow unnecessary labels.
        "no-extra-label": "error",
        // disallow fallthrough of case statements.
        "no-fallthrough": "error",
        // disallow leading or trailing decimal points in numeric literals.
        "no-floating-decimal": "error",
        // disallow shorthand type conversions.
        "no-implicit-coercion": "error",
        // disallow var and named function declarations in the global scope.
        "no-implicit-globals": "error",
        // disallow the use of eval()-like methods.
        "no-implied-eval": "error",
        // disallow this keywords outside of classes or class-like objects.
        "no-invalid-this": "off",
        // disallow the use of the __iterator__ property.
        "no-iterator": "error",
        // disallow labeled statements.
        "no-labels": "error",
        // disallow unnecessary nested blocks.
        "no-lone-blocks": "error",
        // disallow function declarations and expressions inside loop statements.
        "no-loop-func": "error",
        // disallow magic numbers.
        "no-magic-numbers": [
            "error",
            {
                "ignore": [1]
            }
        ],
        // disallow multiple spaces.
        "no-multi-spaces": [
            "error",
            {
                "exceptions": {
                    "Property": true,
                    "VariableDeclarator": true,
                    "ImportDeclaration": true
                }
            }
        ],
        // disallow multiline strings.
        "no-multi-str": "error",
        // disallow assignments to native objects or read-only global variables.
        "no-native-reassign": "error",
        // disallow new operators outside of assignments or comparisons.
        "no-new": "error",
        // disallow new operators with the Function object.
        "no-new-func": "error",
        // disallow new operators with the String, Number, and Boolean objects.
        "no-new-wrappers": "error",
        // disallow octal literals.
        "no-octal": "error",
        // disallow octal escape sequences in string literals.
        "no-octal-escape": "error",
        // disallow reassigning function parameters.
        "no-param-reassign": [
            "error",
            {
                "props": false
            }
        ],
        // disallow the use of the __proto__ property.
        "no-proto": "error",
        // disallow var redeclaration.
        "no-redeclare": "error",
        // disallow assignment operators in return statements.
        "no-return-assign": "error",
        // disallow javascript: urls.
        "no-script-url": "error",
        // disallow assignments where both sides are exactly the same.
        "no-self-assign": "error",
        // disallow comparisons where both sides are exactly the same.
        "no-self-compare": "error",
        // disallow comma operators.
        "no-sequences": "error",
        // disallow throwing literals as exceptions.
        "no-throw-literal": "off",
        // disallow unmodified loop conditions.
        "no-unmodified-loop-condition": "error",
        // disallow unused expressions.
        "no-unused-expressions": "error",
        // disallow unused labels.
        "no-unused-labels": "error",
        // disallow unnecessary calls to .call() and .apply().
        "no-useless-call": "error",
        // disallow unnecessary concatenation of literals or template literals.
        "no-useless-concat": "error",
        // disallow unnecessary escape characters.
        "no-useless-escape": "error",
        // disallow void operators.
        "no-void": "error",
        // disallow specified warning terms in comments.
        "no-warning-comments": "error",
        // disallow with statements.
        "no-with": "error",
        // enforce the consistent use of the radix argument when using parseInt().
        "radix": "error",
        // require var declarations be placed at the top of their containing scope.
        "vars-on-top": "error",
        // require parentheses around immediate function invocations.
        "wrap-iife": "error",
        // require or disallow “Yoda” conditions.
        "yoda": [
            "error",
            "never"
        ],
        
        
        // These rules relate to strict mode directives:
        
        // require or disallow strict mode directives.
        "strict": "error",
        
        
        // These rules relate to variable declarations:
        
        // require or disallow initialization in var declarations.
        "init-declarations": "error",
        // disallow catch clause parameters from shadowing variables in the outer scope.
        "no-catch-shadow": "off",
        // disallow deleting variables.
        "no-delete-var": "error",
        // disallow labels that share a name with a variable.
        "no-label-var": "error",
        // disallow specified global variables.
        "no-restricted-globals": "error",
        // disallow var declarations from shadowing variables in the outer scope.
        "no-shadow": [
            "error",
            {
                "hoist": "all",
                "allow": [
                  "index",
                  "event",
                  "error"
                ]
            }
        ],
        // disallow identifiers from shadowing restricted names.
        "no-shadow-restricted-names": "error",
        // disallow the use of undeclared variables unless mentioned in /*global */ comments.
        "no-undef": "error",
        // disallow initializing variables to undefined.
        "no-undef-init": "error",
        // disallow the use of undefined as an identifier.
        "no-undefined": "off",
        // disallow unused variables.
        "no-unused-vars": "warn",
        // disallow the use of variables before they are defined.
        "no-use-before-define": "error",
        
        
        // These rules relate to code running in Node.js, or in browsers with CommonJS:
        
        // require return statements after callbacks.
        "callback-return": "error",
        // require require() calls to be placed at top-level module scope.
        "global-require": "off",
        // require error handling in callbacks.
        "handle-callback-err": "error",
        // disallow require calls to be mixed with regular var declarations.
        "no-mixed-requires": "error",
        // disallow new operators with calls to require.
        "no-new-require": "error",
        // disallow string concatenation with __dirname and __filename.
        "no-path-concat": "error",
        // disallow the use of process.env.
        "no-process-env": "error",
        // disallow the use of process.exit().
        "no-process-exit": "error",
        // disallow specified modules when loaded by require.
        "no-restricted-modules": "error",
        // disallow synchronous methods.
        "no-sync": "off",
        
        
        // These rules relate to style guidelines, and are therefore quite subjective:
        
        // enforce consistent spacing inside array brackets.
        "array-bracket-spacing": [
            "error",
            "never"
        ],
        // enforce consistent spacing inside single-line blocks.
        "block-spacing": "error",
        // enforce consistent brace style for blocks.
        "brace-style": [
            "error",
            "1tbs"
        ],
        // enforce camelcase naming convention.
        "camelcase": "off",
        // require or disallow trailing commas.
        "comma-dangle": "error",
        // enforce consistent spacing before and after commas.
        "comma-spacing": [
            "error",
            {
                "after": true,
                "before": false
            }
        ],
        // enforce consistent comma style.
        "comma-style": [
            "error",
            "last"
        ],
        // enforce consistent spacing inside computed property brackets.
        "computed-property-spacing": [
            "error",
            "never"
        ],
        // enforce consistent naming when capturing the current execution context.
        "consistent-this": "off",
        // enforce at least one newline at the end of files.
        "eol-last": "error",
        // require or disallow named function expressions.
        "func-names": "error",
        // enforce the consistent use of either function declarations or expressions.
        "func-style": "off",
        // disallow specified identifiers.
        "id-blacklist": "error",
        // enforce minimum and maximum identifier lengths.
        "id-length": "off",
        // require identifiers to match a specified regular expression.
        "id-match": "error",
        // enforce consistent indentation.
        "indent": [
            "error",
            2,
            {
                "VariableDeclarator": {
                    "var": 2,
                    "let": 2,
                    "const": 3
                }
            }
        ],
        // enforce the consistent use of either double or single quotes in JSX attributes.
        "jsx-quotes": "error",
        // enforce consistent spacing between keys and values in object literal properties.
        "key-spacing": "error",
        // enforce consistent spacing before and after keywords.
        "keyword-spacing": [
            "error",
            {
                "after": true,
                "before": true
            }
        ],
        // enforce consistent linebreak style.
        "linebreak-style": [
            "error",
            "unix"
        ],
        // require empty lines around comments.
        "lines-around-comment": "error",
        // enforce a maximum depth that blocks can be nested.
        "max-depth": "error",
        // enforce a maximum line length.
        "max-len": "off",
        // enforce a maximum file length.
        "max-lines": "off",
        // enforce a maximum depth that callbacks can be nested.
        "max-nested-callbacks": "error",
        // enforce a maximum number of parameters in function definitions.
        "max-params": "warn",
        // enforce a maximum number of statements allowed in function blocks.
        "max-statements": "warn",
        // enforce a maximum number of statements allowed per line.
        "max-statements-per-line": "error",
        // require constructor function names to begin with a capital letter.
        "new-cap": "error",
        // require parentheses when invoking a constructor with no arguments.
        "new-parens": "error",
        // require or disallow an empty line after var declarations.
        "newline-after-var": "error",
        // require an empty line before return statements.
        "newline-before-return": "error",
        // require a newline after each call in a method chain.
        "newline-per-chained-call": "error",
        // disallow Array constructors.
        "no-array-constructor": "error",
        // disallow bitwise operators.
        "no-bitwise": "error",
        // disallow continue statements.
        "no-continue": "off",
        // disallow inline comments after code.
        "no-inline-comments": "warn",
        // disallow if statements as the only statement in else blocks.
        "no-lonely-if": "off",
        // disallow mixes of different operators.
        "no-mixed-operators": "error",
        // disallow mixed spaces and tabs for indentation.
        "no-mixed-spaces-and-tabs": "error",
        // disallow multiple empty lines.
        "no-multiple-empty-lines": [
            "error",
            {
                "max": 3
            }
        ],
        // disallow negated conditions.
        "no-negated-condition": "off",
        // disallow nested ternary expressions.
        "no-nested-ternary": "error",
        // disallow Object constructors.
        "no-new-object": "error",
        // disallow the unary operators ++ and --.
        "no-plusplus": "off",
        // disallow specified syntax.
        "no-restricted-syntax": "error",
        // disallow spacing between function identifiers and their applications.
        "no-spaced-func": "error",
        // disallow ternary operators.
        "no-ternary": "off",
        // disallow trailing whitespace at the end of lines.
        "no-trailing-spaces": [
            "error",
            {
                "skipBlankLines": true
            }
        ],
        // disallow dangling underscores in identifiers.
        "no-underscore-dangle": "off",
        // disallow ternary operators when simpler alternatives exist.
        "no-unneeded-ternary": "error",
        // disallow whitespace before properties.
        "no-whitespace-before-property": "error",
        // enforce consistent line breaks inside braces.
        "object-curly-newline": "error",
        // enforce consistent spacing inside braces.
        "object-curly-spacing": [
            "error",
            "always"
        ],
        // enforce placing object properties on separate lines.
        "object-property-newline": [
            "error",
            {
                "allowMultiplePropertiesPerLine": true
            }
        ],
        // enforce variables to be declared either together or separately in functions.
        "one-var": "off",
        // require or disallow newlines around var declarations.
        "one-var-declaration-per-line": "error",
        // require or disallow assignment operator shorthand where possible.
        "operator-assignment": "error",
        // enforce consistent linebreak style for operators.
        "operator-linebreak": "error",
        // require or disallow padding within blocks.
        "padded-blocks": "error",
        // require quotes around object literal property names.
        "quote-props": "off",
        // enforce the consistent use of either backticks, double, or single quotes.
        "quotes": "off",
        // require JSDoc comments.
        "require-jsdoc": "error",
        // require or disallow semicolons instead of ASI.
        "semi": "error",
        // enforce consistent spacing before and after semicolons.
        "semi-spacing": [
            "error",
            {
                "after": true,
                "before": false
            }
        ],
        // require variables within the same declaration block to be sorted.
        "sort-vars": "off",
        // enforce consistent spacing before blocks.
        "space-before-blocks": "error",
        // enforce consistent spacing before function definition opening parenthesis.
        "space-before-function-paren": "error",
        // enforce consistent spacing inside parentheses.
        "space-in-parens": [
            "error",
            "never"
        ],
        // require spacing around operators.
        "space-infix-ops": "error",
        // enforce consistent spacing before or after unary operators.
        "space-unary-ops": "error",
        // enforce consistent spacing after the // or /* in a comment
        "spaced-comment": "off",
        // require or disallow the Unicode BOM.
        "unicode-bom": "error",
        // require parenthesis around regex literals.
        "wrap-regex": "error",
        
        
        // These rules relate to ES6, also known as ES2015:
        
        // require braces around arrow function bodies.
        "arrow-body-style": "off",
        // require parentheses around arrow function arguments.
        "arrow-parens": [
            "error",
            "always"
        ],
        // enforce consistent spacing before and after the arrow in arrow functions.
        "arrow-spacing": [
            "error",
            {
                "after": true,
                "before": true
            }
        ],
        // require super() calls in constructors.
        "constructor-super": "error",
        // enforce consistent spacing around * operators in generator functions.
        "generator-star-spacing": "error",
        // disallow reassigning class members.
        "no-class-assign": "error",
        // disallow arrow functions where they could be confused with comparisons.
        "no-confusing-arrow": "off",
        // disallow reassigning const variables.
        "no-const-assign": "error",
        // disallow duplicate class members.
        "no-dupe-class-members": "error",
        // disallow duplicate module imports.
        "no-duplicate-imports": "error",
        // disallow new operators with the Symbol object.
        "no-new-symbol": "error",
        // disallow specified modules when loaded by import.
        "no-restricted-imports": "error",
        // disallow this/super before calling super() in constructors.
        "no-this-before-super": "error",
        // disallow unnecessary computed property keys in object literals.
        "no-useless-computed-key": "error",
        // disallow unnecessary constructors.
        "no-useless-constructor": "error",
        // disallow renaming import, export, and destructured assignments to the same name.
        "no-useless-rename": "error",
        // require let or const instead of var.
        "no-var": "error",
        // require or disallow method and property shorthand syntax for object literals.
        "object-shorthand": "error",
        // require arrow functions as callbacks.
        "prefer-arrow-callback": "error",
        // require const declarations for variables that are never reassigned after declared.
        "prefer-const": "error",
        // require Reflect methods where applicable.
        "prefer-reflect": "off",
        // require rest parameters instead of arguments.
        "prefer-rest-params": "error",
        // require spread operators instead of .apply().
        "prefer-spread": "error",
        // require template literals instead of string concatenation.
        "prefer-template": "error",
        // require generator functions to contain yield.
        "require-yield": "error",
        // enforce spacing between rest and spread operators and their expressions.
        "rest-spread-spacing": "error",
        // enforce sorted import declarations within modules.
        "sort-imports": "off",
        // require or disallow spacing around embedded expressions of template strings.
        "template-curly-spacing": [
            "error",
            "never"
        ],
        // require or disallow spacing around the * in yield* expressions.
        "yield-star-spacing": "error"
    }
}