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72 lines
1.3 KiB
Text
72 lines
1.3 KiB
Text
---
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description: 'Disallow type arguments that are equal to the default.'
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---
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> 🛑 This file is source code, not the primary documentation location! 🛑
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>
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> See **https://typescript-eslint.io/rules/no-unnecessary-type-arguments** for documentation.
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Warns if an explicitly specified type argument is the default for that type parameter.
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## Rule Details
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Type parameters in TypeScript may specify a default value.
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For example:
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```ts
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function f<T = number>() {}
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```
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It is redundant to provide an explicit type parameter equal to that default.
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Examples of code for this rule:
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<!--tabs-->
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### ❌ Incorrect
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```ts
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function f<T = number>() {}
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f<number>();
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function g<T = number, U = string>() {}
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g<string, string>();
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class C<T = number> {}
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function h(c: C<number>) {}
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new C<number>();
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class D extends C<number> {}
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interface I<T = number> {}
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class Impl implements I<number> {}
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```
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### ✅ Correct
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```ts
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function f<T = number>() {}
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f<string>();
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function g<T = number, U = string>() {}
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g<number, number>();
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class C<T = number> {}
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new C<string>();
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class D extends C<string> {}
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interface I<T = number> {}
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class Impl implements I<string> {}
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```
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## Options
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```jsonc
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// .eslintrc.json
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{
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"rules": {
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"@typescript-eslint/no-unnecessary-type-arguments": "warn"
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}
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}
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```
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This rule is not configurable.
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