---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.js
---
# Input
```jsx
class Bioo {
	#unusedProperty = 5;

	#unusedMethod() {

	};
}

class OnlyWrite {
	#usedOnlyInWrite = 5;

	method() {
			this.#usedOnlyInWrite = 212;
	}
}

class SelfUpdate {
	#usedOnlyToUpdateItself = 5;

	method() {
			this.#usedOnlyToUpdateItself++;
	}
}

class Accessor {
	get #unusedAccessor() {}
	set #unusedAccessor(value) {}
}

class First {
	#unusedMemberInFirstClass = 5;
}

class Foo {
	#usedOnlyInWrite = 5;
	method() {
			this.#usedOnlyInWrite = 42;
	}
}

class Foo {
	#usedOnlyInWriteStatement = 5;
	method() {
			this.#usedOnlyInWriteStatement += 42;
	}
}

class C {
	#usedOnlyInIncrement;

	foo() {
			this.#usedOnlyInIncrement++;
	}
}

```

# Diagnostics
```
invalid.js:2:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    1 │ class Bioo {
  > 2 │ 	#unusedProperty = 5;
      │ 	^^^^^^^^^^^^^^^
    3 │ 
    4 │ 	#unusedMethod() {
  
  i Unsafe fix: Remove unused declaration.
  
     1  1 │   class Bioo {
     2    │ - → #unusedProperty·=·5;
     3  2 │   
     4  3 │   	#unusedMethod() {
  

```

```
invalid.js:4:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    2 │ 	#unusedProperty = 5;
    3 │ 
  > 4 │ 	#unusedMethod() {
      │ 	^^^^^^^^^^^^^
    5 │ 
    6 │ 	};
  
  i Unsafe fix: Remove unused declaration.
  
     1  1 │   class Bioo {
     2    │ - → #unusedProperty·=·5;
     3    │ - 
     4    │ - → #unusedMethod()·{
     5    │ - 
     6    │ - → };
        2 │ + → #unusedProperty·=·5;;
     7  3 │   }
     8  4 │   
  

```

```
invalid.js:10:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
     9 │ class OnlyWrite {
  > 10 │ 	#usedOnlyInWrite = 5;
       │ 	^^^^^^^^^^^^^^^^
    11 │ 
    12 │ 	method() {
  
  i Unsafe fix: Remove unused declaration.
  
     8  8 │   
     9  9 │   class OnlyWrite {
    10    │ - → #usedOnlyInWrite·=·5;
    11 10 │   
    12 11 │   	method() {
  

```

```
invalid.js:18:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    17 │ class SelfUpdate {
  > 18 │ 	#usedOnlyToUpdateItself = 5;
       │ 	^^^^^^^^^^^^^^^^^^^^^^^
    19 │ 
    20 │ 	method() {
  
  i Unsafe fix: Remove unused declaration.
  
    16 16 │   
    17 17 │   class SelfUpdate {
    18    │ - → #usedOnlyToUpdateItself·=·5;
    19 18 │   
    20 19 │   	method() {
  

```

```
invalid.js:26:6 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    25 │ class Accessor {
  > 26 │ 	get #unusedAccessor() {}
       │ 	    ^^^^^^^^^^^^^^^
    27 │ 	set #unusedAccessor(value) {}
    28 │ }
  
  i Unsafe fix: Remove unused declaration.
  
    24 24 │   
    25 25 │   class Accessor {
    26    │ - → get·#unusedAccessor()·{}
    27    │ - → set·#unusedAccessor(value)·{}
       26 │ + → set·#unusedAccessor(value)·{}
    28 27 │   }
    29 28 │   
  

```

```
invalid.js:27:6 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    25 │ class Accessor {
    26 │ 	get #unusedAccessor() {}
  > 27 │ 	set #unusedAccessor(value) {}
       │ 	    ^^^^^^^^^^^^^^^
    28 │ }
    29 │ 
  
  i Unsafe fix: Remove unused declaration.
  
    25 25 │   class Accessor {
    26 26 │   	get #unusedAccessor() {}
    27    │ - → set·#unusedAccessor(value)·{}
    28 27 │   }
    29 28 │   
  

```

```
invalid.js:31:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    30 │ class First {
  > 31 │ 	#unusedMemberInFirstClass = 5;
       │ 	^^^^^^^^^^^^^^^^^^^^^^^^^
    32 │ }
    33 │ 
  
  i Unsafe fix: Remove unused declaration.
  
    29 29 │   
    30 30 │   class First {
    31    │ - → #unusedMemberInFirstClass·=·5;
    32 31 │   }
    33 32 │   
  

```

```
invalid.js:35:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    34 │ class Foo {
  > 35 │ 	#usedOnlyInWrite = 5;
       │ 	^^^^^^^^^^^^^^^^
    36 │ 	method() {
    37 │ 			this.#usedOnlyInWrite = 42;
  
  i Unsafe fix: Remove unused declaration.
  
    33 33 │   
    34 34 │   class Foo {
    35    │ - → #usedOnlyInWrite·=·5;
    36    │ - → method()·{
       35 │ + → method()·{
    37 36 │   			this.#usedOnlyInWrite = 42;
    38 37 │   	}
  

```

```
invalid.js:42:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    41 │ class Foo {
  > 42 │ 	#usedOnlyInWriteStatement = 5;
       │ 	^^^^^^^^^^^^^^^^^^^^^^^^^
    43 │ 	method() {
    44 │ 			this.#usedOnlyInWriteStatement += 42;
  
  i Unsafe fix: Remove unused declaration.
  
    40 40 │   
    41 41 │   class Foo {
    42    │ - → #usedOnlyInWriteStatement·=·5;
    43    │ - → method()·{
       42 │ + → method()·{
    44 43 │   			this.#usedOnlyInWriteStatement += 42;
    45 44 │   	}
  

```

```
invalid.js:49:2 lint/correctness/noUnusedPrivateClassMembers  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This private class member is defined but never used.
  
    48 │ class C {
  > 49 │ 	#usedOnlyInIncrement;
       │ 	^^^^^^^^^^^^^^^^^^^^
    50 │ 
    51 │ 	foo() {
  
  i Unsafe fix: Remove unused declaration.
  
    47 47 │   
    48 48 │   class C {
    49    │ - → #usedOnlyInIncrement;
    50 49 │   
    51 50 │   	foo() {
  

```