---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.ts
---
# Input
```ts
let a!: number = 5;
```

# Diagnostics
```
invalid.ts:1:16 parse/noInitializerWithDefinite ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Declarations with initializers cannot also have definite assignment assertions.
  
  > 1 │ let a!: number = 5;
      │                ^^^
  

```