---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.js
---
# Input
```jsx
void 0;
function f() {
	return void 0;
}
var foo = void 0;
void(0);


```

# Diagnostics
```
invalid.js:1:1 lint/complexity/noVoid ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! The use of void is not allowed.
  
  > 1 │ void 0;
      │ ^^^^^^
    2 │ function f() {
    3 │ 	return void 0;
  
  i If you use void to alter the return type of a function or return `undefined`, use the global `undefined` instead.
  

```

```
invalid.js:3:9 lint/complexity/noVoid ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! The use of void is not allowed.
  
    1 │ void 0;
    2 │ function f() {
  > 3 │ 	return void 0;
      │ 	       ^^^^^^
    4 │ }
    5 │ var foo = void 0;
  
  i If you use void to alter the return type of a function or return `undefined`, use the global `undefined` instead.
  

```

```
invalid.js:5:11 lint/complexity/noVoid ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! The use of void is not allowed.
  
    3 │ 	return void 0;
    4 │ }
  > 5 │ var foo = void 0;
      │           ^^^^^^
    6 │ void(0);
    7 │ 
  
  i If you use void to alter the return type of a function or return `undefined`, use the global `undefined` instead.
  

```

```
invalid.js:6:1 lint/complexity/noVoid ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! The use of void is not allowed.
  
    4 │ }
    5 │ var foo = void 0;
  > 6 │ void(0);
      │ ^^^^^^^
    7 │ 
  
  i If you use void to alter the return type of a function or return `undefined`, use the global `undefined` instead.
  

```