---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: valid.ts
---
# Input
```ts

let i: I;
interface I {}

let t: T;
type T = T[] | null;

let e: E;
enum E {}

let n = N.X;
namespace N {
    export const X = 0;
}

type X = typeof X; const X = 0;

```