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# no-unnecessary-type-arguments

[Added in v0.1.4](https://github.com/web-infra-dev/rslint/releases/tag/v0.1.4)
## Configuration

| Preset                         | Configured Value |
| ------------------------------ | ---------------- |
| ✅ ts.configs.strictTypeChecked | `"error"`        |


```ts title=rslint.config.ts
import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/no-unnecessary-type-arguments': 'error',
    },
  },
]);
```

## Rule Details

Disallow type arguments that are equal to the default.

If a type parameter has a default value and an explicit type argument provides the same type, the argument is redundant and can be omitted for cleaner code.

Examples of **incorrect** code for this rule:

```typescript
function f<T = number>() {}
f<number>(); // number is the default, can be omitted

type Foo<T = string> = T[];
const x: Foo<string> = []; // string is the default

class Bar<T = boolean> {}
new Bar<boolean>(); // boolean is the default
```

Examples of **correct** code for this rule:

```typescript
function f<T = number>() {}
f(); // uses default
f<string>(); // overrides default

type Foo<T = string> = T[];
const x: Foo = [];
const y: Foo<number> = [];
```

## Original Documentation

- [typescript-eslint: no-unnecessary-type-arguments](https://typescript-eslint.io/rules/no-unnecessary-type-arguments)
- [Source code](https://github.com/typescript-eslint/typescript-eslint/blob/v8.29.0/packages/eslint-plugin/src/rules/no-unnecessary-type-arguments.ts)