---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: valid.jsonc
---
# Input
```cjs
-1 in [1,2];
```

# Input
```cjs
~1 in [1,2];
```

# Input
```cjs
typeof 1 in [1,2];
```

# Input
```cjs
void 1 in [1,2];
```

# Input
```cjs
delete 1 in [1,2];
```

# Input
```cjs
+1 instanceof [1,2];
```