---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: filename.invalid-extension.js
---
# Input
```jsx

```

# Diagnostics
```
filename.invalid-extension.js lint/style/useFilenamingConvention ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! The file extension should be in lowercase without any special characters.
  

```