# unicorn/no-static-only-class

> Disallow classes that have only `static` members

A class with only `static` members has nothing to instantiate. It groups values and functions under a name, and a plain object does that with less syntax.

A class isn't reported if it extends another class, has a decorator, is empty, or has a member that an object can't have: a private `#name`, a static block, or in TypeScript a member marked `readonly`, `declare`, `public`, `protected` or `private`.

`--fix-dangerously` rewrites the class to an object. `--fix` doesn't, because code that calls `new` on the class or uses it as a type would stop working.

{/* 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]
"unicorn/no-static-only-class" = "error" # or "warn"
```

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

## Examples

Reported:

{/* bad */}
```js
class Temperature {
  static freezing = 32;

  static toCelsius(fahrenheit) {
    return ((fahrenheit - 32) * 5) / 9;
  }
}
```

Not reported:

{/* good */}
```js
const Temperature = {
  freezing: 32,

  toCelsius(fahrenheit) {
    return ((fahrenheit - 32) * 5) / 9;
  },
};
```

A class with a private member isn't reported:

{/* good */}
```js
class Counter {
  static #count = 0;

  static next() {
    return ++Counter.#count;
  }
}
```

Neither is one with a TypeScript modifier:

{/* good */}
```ts
class Limits {
  static readonly maxRetries = 3;
  private static attempts = 0;
}
```