---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.jsonc
---
# Input
```cjs
class A { constructor(){} }
```

# Diagnostics
```
invalid.jsonc:1:11 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This constructor is unnecessary.
  
  > 1 │ class A { constructor(){} }
      │           ^^^^^^^^^^^^^^^
  
  i Unsafe fix: Remove the unnecessary constructor.
  
    1 │ class·A·{·constructor(){}·}
      │           ---------------- 

```

# Input
```cjs
class A { 'constructor'(){} }
```

# Diagnostics
```
invalid.jsonc:1:11 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This constructor is unnecessary.
  
  > 1 │ class A { 'constructor'(){} }
      │           ^^^^^^^^^^^^^^^^^
  
  i Unsafe fix: Remove the unnecessary constructor.
  
    1 │ class·A·{·'constructor'(){}·}
      │           ------------------ 

```

# Input
```cjs
class A extends B { constructor() { super(); } }
```

# Diagnostics
```
invalid.jsonc:1:21 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

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

```

# Input
```cjs
class A extends B { constructor(foo){ super(foo); } }
```

# Diagnostics
```
invalid.jsonc:1:21 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

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

```

# Input
```cjs
class A extends B { constructor(foo, bar){ super(foo, bar); } }
```

# Diagnostics
```
invalid.jsonc:1:21 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This constructor is unnecessary.
  
  > 1 │ class A extends B { constructor(foo, bar){ super(foo, bar); } }
      │                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  
  i Unsafe fix: Remove the unnecessary constructor.
  
    1 │ class·A·extends·B·{·constructor(foo,·bar){·super(foo,·bar);·}·}
      │                     ------------------------------------------ 

```

# Input
```cjs
class A extends B { constructor(...args){ super(...args); } }
```

# Diagnostics
```
invalid.jsonc:1:21 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This constructor is unnecessary.
  
  > 1 │ class A extends B { constructor(...args){ super(...args); } }
      │                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  
  i Unsafe fix: Remove the unnecessary constructor.
  
    1 │ class·A·extends·B·{·constructor(...args){·super(...args);·}·}
      │                     ---------------------------------------- 

```

# Input
```cjs
class A extends B { constructor(a, b, ...c) { super(a, b, ...c); } }
```

# Diagnostics
```
invalid.jsonc:1:21 lint/complexity/noUselessConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This constructor is unnecessary.
  
  > 1 │ class A extends B { constructor(a, b, ...c) { super(a, b, ...c); } }
      │                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  
  i Unsafe fix: Remove the unnecessary constructor.
  
    1 │ class·A·extends·B·{·constructor(a,·b,·...c)·{·super(a,·b,·...c);·}·}
      │                     ----------------------------------------------- 

```