---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.js
---
# Input
```jsx
/*before*/ A /*inner*/: /*after*/ while(true) {};

A: for (let i = 0; i < 10; ++i) {
	foo();
}

A: {
	foo();
}

A: {
	foo();
	bar();
}

A: for (var i = 0; i < 10; ++i) {
	foo();
	if (a) break;
	bar();
}

A: for (var i = 0; i < 10; ++i) {
	foo();
	if (a) continue;
	bar();
}

A: for (var i = 0; i < 10; ++i) {
	H: break A;
}

A: {
	var I = 0;
	console.log(I);
}

A: {
	function f() {
		A: {
			break A;
		}
	}
}

A: {
	class X {
		static {
			B: {
				break B;
			}
		}

		method() {
			B: {
				break B;
			}
		}
	}
}

/*
 * Below is fatal errors.
 * "A: break B",
 * "A: function foo() { break A; }",
 * "A: class Foo { foo() { break A; } }",
 * "A: { A: { break A; } }"
 */

```

# Diagnostics
```
invalid.js:1:12 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
  > 1 │ /*before*/ A /*inner*/: /*after*/ while(true) {};
      │            ^
    2 │ 
    3 │ A: for (let i = 0; i < 10; ++i) {
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    1 │ /*before*/·A·/*inner*/:·/*after*/·while(true)·{};
      │            -----------------------               

```

```
invalid.js:3:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
    1 │ /*before*/ A /*inner*/: /*after*/ while(true) {};
    2 │ 
  > 3 │ A: for (let i = 0; i < 10; ++i) {
      │ ^
    4 │ 	foo();
    5 │ }
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    3 │ A:·for·(let·i·=·0;·i·<·10;·++i)·{
      │ ---                              

```

```
invalid.js:7:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
    5 │ }
    6 │ 
  > 7 │ A: {
      │ ^
    8 │ 	foo();
    9 │ }
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    7 │ A:·{
      │ --- 

```

```
invalid.js:11:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
     9 │ }
    10 │ 
  > 11 │ A: {
       │ ^
    12 │ 	foo();
    13 │ 	bar();
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    11 │ A:·{
       │ --- 

```

```
invalid.js:16:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
    14 │ }
    15 │ 
  > 16 │ A: for (var i = 0; i < 10; ++i) {
       │ ^
    17 │ 	foo();
    18 │ 	if (a) break;
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    16 │ A:·for·(var·i·=·0;·i·<·10;·++i)·{
       │ ---                              

```

```
invalid.js:22:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
    20 │ }
    21 │ 
  > 22 │ A: for (var i = 0; i < 10; ++i) {
       │ ^
    23 │ 	foo();
    24 │ 	if (a) continue;
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    22 │ A:·for·(var·i·=·0;·i·<·10;·++i)·{
       │ ---                              

```

```
invalid.js:32:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
    30 │ }
    31 │ 
  > 32 │ A: {
       │ ^
    33 │ 	var I = 0;
    34 │ 	console.log(I);
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    32 │ A:·{
       │ --- 

```

```
invalid.js:37:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
    35 │ }
    36 │ 
  > 37 │ A: {
       │ ^
    38 │ 	function f() {
    39 │ 		A: {
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    37 │ A:·{
       │ --- 

```

```
invalid.js:45:1 lint/correctness/noUnusedLabels  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unused label.
  
    43 │ }
    44 │ 
  > 45 │ A: {
       │ ^
    46 │ 	class X {
    47 │ 		static {
  
  i The label is not used by any break statement and continue statement.
  
  i Safe fix: Remove the unused label.
  
    45 │ A:·{
       │ --- 

```