---
title: "@typescript-eslint/no-unused-private-class-members"
description: "Disallow private class members that are never used"
# Generated by src/codegen/lint-rule-docs.ts. Do not edit below this line.
plugin: "typescript"
aliases: ["typescript-eslint/no-unused-private-class-members","typescript/no-unused-private-class-members"]
kind: "problem"
category: null
default: "off"
fixable: "no"
typeAware: false
deprecated: false
---

Only the class itself can use its private members. If it never uses one, that member is dead code, often left behind after a refactor.

The rule checks `#private` members, members marked `private`, and `private` parameter properties. A field that's only assigned to, or only changed with `+=` or `++`, counts as unused, because nothing ever reads the value.

{/* Generated by src/codegen/lint-rule-docs.ts. Do not edit this section. */}

## Configure

Off by default. To turn it on:

```toml bunfig.toml
[lint.rules]
"@typescript-eslint/no-unused-private-class-members" = "error" # or "warn"
```

{/* End of the generated section. */}

## Examples

Reported:

{/* bad {"count": 3} */}
```ts
class Cache {
  #size = 0;
  private hits = 0;

  constructor(private limit: number) {}

  add() {
    this.hits += 1;
  }
}
```

Not reported:

{/* good */}
```ts
class Cache {
  #size = 0;
  private hits = 0;

  constructor(private limit: number) {}

  add() {
    this.hits += 1;
    return this.#size < this.limit ? this.hits : 0;
  }
}
```

A private setter can run code, so assigning to it counts as a use:

{/* good */}
```ts
class Cache {
  set #limit(value: number) {
    console.log("limit is now", value);
  }

  reset() {
    this.#limit = 0;
  }
}
```