---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.ts
---
# Input
```ts
interface Foo {}

```

# Diagnostics
```
invalid.ts:1:1 lint/suspicious/noEmptyInterface  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! An empty interface is equivalent to {}.
  
  > 1 │ interface Foo {}
      │ ^^^^^^^^^^^^^^^^
    2 │ 
  
  i Safe fix: Use a type alias instead.
  
    1   │ - interface·Foo·{}
      1 │ + type·Foo·=·{}
    2 2 │   
  

```