# @typescript-eslint/related-getter-setter-pairs

> Require the type of a getter to be assignable to the type of its setter

TypeScript lets a property's getter and setter have different types. If the getter can return something the setter doesn't accept, then `field.value = field.value` is a type error, which nobody expects from a property.

The other direction is fine, so a setter can accept more than the getter returns. A getter without a return type annotation isn't checked.

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

## Configure

Off by default. This rule needs types, so turning it on makes `bun lint` type check your code first.

```toml bunfig.toml
[lint.rules]
"@typescript-eslint/related-getter-setter-pairs" = "error" # or "warn"
```

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

## Examples

Reported:

{/* bad */}
```ts
interface Field {
  get value(): string | undefined;
  set value(next: string);
}
```

Not reported:

{/* good */}
```ts
interface Field {
  get value(): string;
  set value(next: string | undefined);
}

class Width {
  #px = 0;
  get size(): number {
    return this.#px;
  }
  set size(next: number | string) {
    this.#px = Number(next);
  }
}
```