no-label-var

Disallow labels that share a name with a variable

Rule Details

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.

Examples of incorrect code for this rule:

/*eslint no-label-var: "error"*/

var x = foo;
function bar() {
x:
  for (;;) {
    break x;
  }
}
1
2
3
4
5
6
7
8
9

Examples of correct code for this rule:

/*eslint no-label-var: "error"*/

// The variable that has the same name as the label is not in scope.

function foo() {
  var q = t;
}

function bar() {
q:
  for(;;) {
    break q;
  }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14

When Not To Use It

If you don’t want to be notified about usage of labels, then it’s safe to disable this rule.

Related Rules

• no-extra-label
• no-labels
• no-unused-labels

Version

This rule was introduced in ESLint v0.0.9.

Resources

• Rule source
• Tests source