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

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