eslint/docs/src/rules/no-label-var.md

   1 ---
   2 title: no-label-var
   3 layout: doc
   4 rule_type: suggestion
   5 related_rules:
   6 - no-extra-label
   7 - no-labels
   8 - no-unused-labels
   9 ---
  10
  11
  12 ## Rule Details
  13
  14 This rule aims to create clearer code by disallowing the bad practice of creating a label that shares a name with a variable that is in scope.
  15
  16 Examples of **incorrect** code for this rule:
  17
  18 ::: incorrect
  19
  20 ```js
  21 /*eslint no-label-var: "error"*/
  22
  23 var x = foo;
  24 function bar() {
  25 x:
  26   for (;;) {
  27     break x;
  28   }
  29 }
  30 ```
  31
  32 :::
  33
  34 Examples of **correct** code for this rule:
  35
  36 ::: correct
  37
  38 ```js
  39 /*eslint no-label-var: "error"*/
  40
  41 // The variable that has the same name as the label is not in scope.
  42
  43 function foo() {
  44   var q = t;
  45 }
  46
  47 function bar() {
  48 q:
  49   for(;;) {
  50     break q;
  51   }
  52 }
  53 ```
  54
  55 :::
  56
  57 ## When Not To Use It
  58
  59 If you don't want to be notified about usage of labels, then it's safe to disable this rule.