---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.ts
---
# Input
```ts
module foo {}
declare module foo {}

namespace foo {}
declare namespace foo {}

```

# Diagnostics
```
invalid.ts:1:1 lint/style/noNamespace ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! TypeScript's namespaces are an oudated way to organize code.
  
  > 1 │ module foo {}
      │ ^^^^^^^^^^^^^
    2 │ declare module foo {}
    3 │ 
  
  i Prefer the ES6 modules (import/export) over namespaces.
  

```

```
invalid.ts:2:9 lint/style/noNamespace ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! TypeScript's namespaces are an oudated way to organize code.
  
    1 │ module foo {}
  > 2 │ declare module foo {}
      │         ^^^^^^^^^^^^^
    3 │ 
    4 │ namespace foo {}
  
  i Prefer the ES6 modules (import/export) over namespaces.
  

```

```
invalid.ts:4:1 lint/style/noNamespace ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! TypeScript's namespaces are an oudated way to organize code.
  
    2 │ declare module foo {}
    3 │ 
  > 4 │ namespace foo {}
      │ ^^^^^^^^^^^^^^^^
    5 │ declare namespace foo {}
    6 │ 
  
  i Prefer the ES6 modules (import/export) over namespaces.
  

```

```
invalid.ts:5:9 lint/style/noNamespace ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! TypeScript's namespaces are an oudated way to organize code.
  
    4 │ namespace foo {}
  > 5 │ declare namespace foo {}
      │         ^^^^^^^^^^^^^^^^
    6 │ 
  
  i Prefer the ES6 modules (import/export) over namespaces.
  

```