---
source: crates/biome_formatter_test/src/snapshot_builder.rs
info: js/sloppy-mode/function-declaration-in-while.js
---

# Input

```js
while (false) function foo(){}

```


# Prettier differences

```diff
--- Prettier
+++ Biome
@@ -1 +1 @@
-while (false) function foo() {}
+while (false) function foo(){}
```

# Output

```js
while (false) function foo(){}
```

# Errors
```
function-declaration-in-while.js:1:15 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × In non-strict mode code, functions can only be declared at top level, inside a block, or as the body of an if or labelled statement
  
  > 1 │ while (false) function foo(){}
      │               ^^^^^^^^^^^^^^^^
    2 │ 
  
  i wrap the function in a block statement
  

```