example of the the configuration file shown below. require quotes around object literal property names, enforce the consistent use of either backticks, double, or single quotes, require or disallow semicolons instead of ASI, enforce consistent spacing before and after semicolons, require variables within the same declaration block to be sorted, enforce consistent spacing before `function` definition opening parenthesis, enforce consistent spacing inside parentheses, enforce consistent spacing before or after unary operators, enforce consistent spacing after the `//` or `/*` in a comment, enforce spacing around colons of switch statements, require or disallow spacing between template tags and their literals, require or disallow Unicode byte order mark (BOM), require parenthesis around regex literals, require braces around arrow function bodies, require parentheses around arrow function arguments, enforce consistent spacing before and after the arrow in arrow functions, enforce consistent spacing around `*` operators in generator functions, disallow arrow functions where they could be confused with comparisons, disallow `new` operators with the `Symbol` object, disallow specified modules when loaded by `import`, disallow `this`/`super` before calling `super()` in constructors, disallow unnecessary computed property keys in objects and classes, disallow renaming import, export, and destructured assignments to the same name, require `let` or `const` instead of `var`, require or disallow method and property shorthand syntax for object literals, require using arrow functions for callbacks, require `const` declarations for variables that are never reassigned after declared, require destructuring from arrays and/or objects, disallow `parseInt()` and `Number.parseInt()` in favor of binary, octal, and hexadecimal literals, require rest parameters instead of `arguments`, require spread operators instead of `.apply()`, require template literals instead of string concatenation, require generator functions to contain `yield`, enforce spacing between rest and spread operators and their expressions, enforce sorted import declarations within modules, require or disallow spacing around embedded expressions of template strings, require or disallow spacing around the `*` in `yield*` expressions. The remaining errors are easy to fix. Rules in ESLint are grouped by category to help you understand their purpose. 'off' tells ESLint to ignore the given rule. This is not valid JavaScript code, because it contains a so-called type annotation. ... Rule Details. ok.. but now, i can't add or edit anything regarding ESLlint. Generating an ESLint plugin scaffold with Yeoman. No rules are enabled by default. \"warn\" or 1 - turn the rule on as a warning (doesn’t affect exit code) 3. Configure your rules. Let’s do some demo example of configuring ESLint for a simple project. disallow using an async function as a Promise executor, disallow assignment operators in conditional expressions, disallow constant expressions in conditions, disallow control characters in regular expressions, disallow duplicate arguments in `function` definitions, disallow duplicate conditions in if-else-if chains, disallow duplicate keys in object literals, disallow empty character classes in regular expressions, disallow reassigning exceptions in `catch` clauses, disallow reassigning `function` declarations, disallow variable or `function` declarations in nested blocks, disallow invalid regular expression strings in `RegExp` constructors, disallow literal numbers that lose precision, disallow characters which are made with multiple code points in character class syntax, disallow calling global object properties as functions, disallow returning values from Promise executor functions, disallow calling some `Object.prototype` methods directly on objects, disallow multiple spaces in regular expressions, disallow template literal placeholder syntax in regular strings, disallow unreachable code after `return`, `throw`, `continue`, and `break` statements, disallow loops with a body that allows only one iteration, disallow control flow statements in `finally` blocks, disallow negating the left operand of relational operators, disallow use of optional chaining in contexts where the `undefined` value is not allowed, disallow useless backreferences in regular expressions, disallow assignments that can lead to race conditions due to usage of `await` or `yield`, require calls to `isNaN()` when checking for `NaN`, enforce comparing `typeof` expressions against valid strings, enforce getter and setter pairs in objects and classes, enforce `return` statements in callbacks of array methods, enforce the use of variables within the scope they are defined, enforce that class methods utilize `this`, enforce a maximum cyclomatic complexity allowed in a program, require `return` statements to either always or never specify values, enforce consistent brace style for all control statements, require `default` cases in `switch` statements, enforce default clauses in switch statements to be last, enforce consistent newlines before and after dots, require grouped accessor pairs in object literals and classes, require `for-in` loops to include an `if` statement, enforce a maximum number of classes per file, disallow the use of `alert`, `confirm`, and `prompt`, disallow the use of `arguments.caller` or `arguments.callee`, disallow lexical declarations in case clauses, disallow returning value from constructor, disallow division operators explicitly at the beginning of regular expressions, disallow `else` blocks after `return` statements in `if` statements, disallow `null` comparisons without type-checking operators, disallow fallthrough of `case` statements, disallow leading or trailing decimal points in numeric literals, disallow assignments to native objects or read-only global variables, disallow declarations in the global scope, disallow the use of `eval()`-like methods, disallow `this` keywords outside of classes or class-like objects, disallow the use of the `__iterator__` property, disallow function declarations that contain unsafe references inside loop statements, disallow `new` operators outside of assignments or comparisons, disallow `new` operators with the `Function` object, disallow `new` operators with the `String`, `Number`, and `Boolean` objects, disallow `\8` and `\9` escape sequences in string literals, disallow octal escape sequences in string literals, disallow reassigning `function` parameters, disallow the use of the `__proto__` property, disallow certain properties on certain objects, disallow assignment operators in `return` statements, disallow assignments where both sides are exactly the same, disallow comparisons where both sides are exactly the same, disallow unnecessary calls to `.call()` and `.apply()`, disallow unnecessary concatenation of literals or template literals, disallow specified warning terms in comments, enforce using named capture group in regular expression, require using Error objects as Promise rejection reasons, disallow use of the `RegExp` constructor in favor of regular expression literals, enforce the consistent use of the radix argument when using `parseInt()`, disallow async functions which have no `await` expression, require `var` declarations be placed at the top of their containing scope, require parentheses around immediate `function` invocations, require or disallow strict mode directives, require or disallow initialization in variable declarations, disallow labels that share a name with a variable, disallow variable declarations from shadowing variables declared in the outer scope, disallow identifiers from shadowing restricted names, disallow the use of undeclared variables unless mentioned in `/*global */` comments, disallow initializing variables to `undefined`, disallow the use of `undefined` as an identifier, disallow the use of variables before they are defined, enforce linebreaks after opening and before closing array brackets, enforce consistent spacing inside array brackets, enforce line breaks after each array element, disallow or enforce spaces inside of blocks after opening block and before closing block, enforce consistent brace style for blocks, enforce or disallow capitalization of the first letter of a comment, enforce consistent spacing before and after commas, enforce consistent spacing inside computed property brackets, enforce consistent naming when capturing the current execution context, require or disallow newline at the end of files, require or disallow spacing between function identifiers and their invocations, require function names to match the name of the variable or property to which they are assigned, require or disallow named `function` expressions, enforce the consistent use of either `function` declarations or expressions, enforce line breaks between arguments of a function call, enforce consistent line breaks inside function parentheses, enforce minimum and maximum identifier lengths, require identifiers to match a specified regular expression, enforce the location of arrow function bodies, enforce the consistent use of either double or single quotes in JSX attributes, enforce consistent spacing between keys and values in object literal properties, enforce consistent spacing before and after keywords, require or disallow an empty line between class members, enforce a maximum depth that blocks can be nested, enforce a maximum number of lines per file, enforce a maximum number of lines of code in a function, enforce a maximum depth that callbacks can be nested, enforce a maximum number of parameters in function definitions, enforce a maximum number of statements allowed in function blocks, enforce a maximum number of statements allowed per line, enforce a particular style for multiline comments, enforce newlines between operands of ternary expressions, require constructor names to begin with a capital letter, enforce or disallow parentheses when invoking a constructor with no arguments, require a newline after each call in a method chain, disallow `if` statements as the only statement in `else` blocks, disallow mixed spaces and tabs for indentation, disallow use of chained assignment expressions, disallow the unary operators `++` and `--`, disallow trailing whitespace at the end of lines, disallow dangling underscores in identifiers, disallow ternary operators when simpler alternatives exist, enforce the location of single-line statements, enforce consistent line breaks inside braces, enforce placing object properties on separate lines, enforce variables to be declared either together or separately in functions, require or disallow newlines around variable declarations, require or disallow assignment operator shorthand where possible, enforce consistent linebreak style for operators, require or disallow padding within blocks, require or disallow padding lines between statements, disallow the use of `Math.pow` in favor of the `**` operator. For example: This setting is similar to --report-unused-disable-directives CLI option, but doesn't fail linting (reports as "warn" severity). * -------- To change a rule setting, you must set the rule ID equal to one of these values: 1. You can modify which rules your project uses either using configuration comments or configuration files. For example, eslint-plugin-vue provides extra Vue-specific rules. enforce "for" loop update clause moving the counter in the right direction. React specific linting rules for ESLint. ESLint has a wide variety of built-in rules, but you can also find new rules on npm. You can also use the numeric equivalent for the rule severity: This example is the same as the last example, only it uses the numeric codes instead of the string values. /* eslint eqeqeq: "off", curly: "error" */, /* eslint quotes: ["error", "double"], curly: 2 */, /* eslint eqeqeq: "off", curly: "error" -- Here's a description about why this configuration is necessary. The advantage of having prettier setup as an ESLint rule using eslint-plugin-prettier is that code can automatically be fixed using ESLint's --fix option.. -------- When the TypeScript Compiler parses this code to produce a TypeScript AST, the : number syntax will be represented in the tree, and this is simply not something that ESLint can understand without additional help.. To report unused eslint-disable comments, use the reportUnusedDisableDirectives setting. For example, below is a.eslintrc.json that treats no-unused-vars as a warning. There are three modes for a rule in eslint: off, warn, and error. In your tslint.json file, insert the rules as described below. When set to true, the rule will ignore the case when you name a type the same as a variable.. TypeScript allows types and variables to shadow one-another. However, if you're really certain you want to allow eval (), you can disable the lint rule as follows: const res = eval('42'); // eslint-disable-line no-eval esplint is a tool that makes it easier to introduce new ESLint rules to large, legacy codebases by tracking, enforcing, and updating file and rule scoped warning counts. In the snippet above rules is empty but feel free to check my overrides. This is a very basic example, where we can already see a few important things about the way ESLint will work. Talks. before version 4.0. all was ok- i had .eslintrc.js file with rules.

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