---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: complexLogicalAndCases.ts
---
# Input
```ts
// currently do not handle complex computed properties
foo && foo[bar as string] && foo[bar as string].baz;
foo && foo[1 + 2] && foo[1 + 2].baz;
foo && foo[typeof bar] && foo[typeof bar].baz;

```

# Diagnostics
```
complexLogicalAndCases.ts:2:1 lint/complexity/useOptionalChain  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Change to an optional chain.
  
    1 │ // currently do not handle complex computed properties
  > 2 │ foo && foo[bar as string] && foo[bar as string].baz;
      │ ^^^^^^^^^^^^^^^^^^^^^^^^^
    3 │ foo && foo[1 + 2] && foo[1 + 2].baz;
    4 │ foo && foo[typeof bar] && foo[typeof bar].baz;
  
  i Unsafe fix: Change to an optional chain.
  
    1 1 │   // currently do not handle complex computed properties
    2   │ - foo·&&·foo[bar·as·string]·&&·foo[bar·as·string].baz;
      2 │ + foo?.[bar·as·string]·&&·foo[bar·as·string].baz;
    3 3 │   foo && foo[1 + 2] && foo[1 + 2].baz;
    4 4 │   foo && foo[typeof bar] && foo[typeof bar].baz;
  

```

```
complexLogicalAndCases.ts:3:1 lint/complexity/useOptionalChain  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Change to an optional chain.
  
    1 │ // currently do not handle complex computed properties
    2 │ foo && foo[bar as string] && foo[bar as string].baz;
  > 3 │ foo && foo[1 + 2] && foo[1 + 2].baz;
      │ ^^^^^^^^^^^^^^^^^
    4 │ foo && foo[typeof bar] && foo[typeof bar].baz;
    5 │ 
  
  i Unsafe fix: Change to an optional chain.
  
    1 1 │   // currently do not handle complex computed properties
    2 2 │   foo && foo[bar as string] && foo[bar as string].baz;
    3   │ - foo·&&·foo[1·+·2]·&&·foo[1·+·2].baz;
      3 │ + foo?.[1·+·2]·&&·foo[1·+·2].baz;
    4 4 │   foo && foo[typeof bar] && foo[typeof bar].baz;
    5 5 │   
  

```

```
complexLogicalAndCases.ts:4:1 lint/complexity/useOptionalChain  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Change to an optional chain.
  
    2 │ foo && foo[bar as string] && foo[bar as string].baz;
    3 │ foo && foo[1 + 2] && foo[1 + 2].baz;
  > 4 │ foo && foo[typeof bar] && foo[typeof bar].baz;
      │ ^^^^^^^^^^^^^^^^^^^^^^
    5 │ 
  
  i Unsafe fix: Change to an optional chain.
  
    2 2 │   foo && foo[bar as string] && foo[bar as string].baz;
    3 3 │   foo && foo[1 + 2] && foo[1 + 2].baz;
    4   │ - foo·&&·foo[typeof·bar]·&&·foo[typeof·bar].baz;
      4 │ + foo?.[typeof·bar]·&&·foo[typeof·bar].baz;
    5 5 │   
  

```