---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.jsonc
---
# Input
```cjs
const isZero = a == 0;
```

# Diagnostics
```
invalid.jsonc:1:18 lint/suspicious/noDoubleEquals  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Use === instead of ==
  
  > 1 │ const isZero = a == 0;
      │                  ^^
  
  i == is only allowed when comparing against null
  
  > 1 │ const isZero = a == 0;
      │                  ^^
  
  i Using == may be unsafe if you are relying on type coercion
  
  i Unsafe fix: Use ===
  
    1 │ const·isZero·=·a·===·0;
      │                    +   

```

# Input
```cjs
const isNonZero = a != 0;
```

# Diagnostics
```
invalid.jsonc:1:21 lint/suspicious/noDoubleEquals  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Use !== instead of !=
  
  > 1 │ const isNonZero = a != 0;
      │                     ^^
  
  i != is only allowed when comparing against null
  
  > 1 │ const isNonZero = a != 0;
      │                     ^^
  
  i Using != may be unsafe if you are relying on type coercion
  
  i Unsafe fix: Use !==
  
    1 │ const·isNonZero·=·a·!==·0;
      │                       +   

```