---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalidMethodParameters.ts
---
# Input
```ts
class D {
	constructor(a: number) {}
	f(a: number) {}
	set a(a: number) {}
}
console.log(new D());
export {}
```

# Diagnostics
```
invalidMethodParameters.ts:2:14 lint/correctness/noUnusedVariables  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━

  ! This parameter is unused.
  
    1 │ class D {
  > 2 │ 	constructor(a: number) {}
      │ 	            ^
    3 │ 	f(a: number) {}
    4 │ 	set a(a: number) {}
  
  i Unused variables usually are result of incomplete refactoring, typos and other source of bugs.
  
  i Unsafe fix: If this is intentional, prepend a with an underscore.
  
    1 1 │   class D {
    2   │ - → constructor(a:·number)·{}
      2 │ + → constructor(_a:·number)·{}
    3 3 │   	f(a: number) {}
    4 4 │   	set a(a: number) {}
  

```

```
invalidMethodParameters.ts:3:4 lint/correctness/noUnusedVariables  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━

  ! This parameter is unused.
  
    1 │ class D {
    2 │ 	constructor(a: number) {}
  > 3 │ 	f(a: number) {}
      │ 	  ^
    4 │ 	set a(a: number) {}
    5 │ }
  
  i Unused variables usually are result of incomplete refactoring, typos and other source of bugs.
  
  i Unsafe fix: If this is intentional, prepend a with an underscore.
  
    1 1 │   class D {
    2 2 │   	constructor(a: number) {}
    3   │ - → f(a:·number)·{}
      3 │ + → f(_a:·number)·{}
    4 4 │   	set a(a: number) {}
    5 5 │   }
  

```

```
invalidMethodParameters.ts:4:8 lint/correctness/noUnusedVariables  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━

  ! This parameter is unused.
  
    2 │ 	constructor(a: number) {}
    3 │ 	f(a: number) {}
  > 4 │ 	set a(a: number) {}
      │ 	      ^
    5 │ }
    6 │ console.log(new D());
  
  i Unused variables usually are result of incomplete refactoring, typos and other source of bugs.
  
  i Unsafe fix: If this is intentional, prepend a with an underscore.
  
    2 2 │   	constructor(a: number) {}
    3 3 │   	f(a: number) {}
    4   │ - → set·a(a:·number)·{}
      4 │ + → set·a(_a:·number)·{}
    5 5 │   }
    6 6 │   console.log(new D());
  

```