---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.cjs
---
# Input
```cjs
with (obj?.foo) {};

```

# Diagnostics
```
invalid.cjs:1:10 lint/correctness/noUnsafeOptionalChaining ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Unsafe usage of optional chaining.
  
  > 1 │ with (obj?.foo) {};
      │          ^^
    2 │ 
  
  i If it short-circuits with 'undefined' the evaluation will throw TypeError here:
  
  > 1 │ with (obj?.foo) {};
      │ ^^^^^^^^^^^^^^^^^^
    2 │ 
  

```