---
description: 'Disallow two overloads that could be unified into one with a union or an optional/rest parameter.'
---

> 🛑 This file is source code, not the primary documentation location! 🛑
>
> See **https://typescript-eslint.io/rules/unified-signatures** for documentation.

## Rule Details

This rule aims to keep the source code as maintainable as possible by reducing the amount of overloads.

Examples of code for this rule with the default options:

<!--tabs-->

### ❌ Incorrect

```ts
function x(x: number): void;
function x(x: string): void;
```

```ts
function y(): void;
function y(...x: number[]): void;
```

### ✅ Correct

```ts
function x(x: number | string): void;
```

```ts
function y(...x: number[]): void;
```

## Options

### `ignoreDifferentlyNamedParameters`

Examples of code for this rule with `ignoreDifferentlyNamedParameters`:

<!--tabs-->

### ❌ Incorrect

```ts
function f(a: number): void;
function f(a: string): void;
```

```ts
function f(...a: number[]): void;
function f(...b: string[]): void;
```

### ✅ Correct

```ts
function f(a: number): void;
function f(b: string): void;
```

```ts
function f(...a: number[]): void;
function f(...a: string[]): void;
```

## Options