---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.ts
---
# Input
```ts
class B extends A {
    constructor(foo: number) {
        super(foo);
    }
}

```

# Diagnostics
```
invalid.ts:2:5 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This constructor is unnecessary.
  
    1 │ class B extends A {
  > 2 │     constructor(foo: number) {
      │     ^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 3 │         super(foo);
  > 4 │     }
      │     ^
    5 │ }
    6 │ 
  
  i Unsafe fix: Remove the unnecessary constructor.
  
    1 1 │   class B extends A {
    2   │ - ····constructor(foo:·number)·{
    3   │ - ········super(foo);
    4   │ - ····}
    5 2 │   }
    6 3 │   
  

```