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docs: replace extend any with unknown for no-unnecessary-type-constra… #6976

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May 31, 2023
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docs: replace extend any with unknown for no-unnecessary-type-constra… #6976

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docs: replace extend any with unknown for no-unnecessary-type-constra…
takanome-dev Apr 30, 2023
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Update packages/eslint-plugin/docs/rules/no-unnecessary-type-constrai…
takanome-dev May 28, 2023
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Merge remote-tracking branch 'upstream/main' into no-unnecessary-type…
takanome-dev May 28, 2023
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8 changes: 6 additions & 2 deletions packages/eslint-plugin/docs/rules/no-unnecessary-type-constraint.md
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Expand Up @@ -7,8 +7,8 @@ description: 'Disallow unnecessary constraints on generic types.'
> See **https://typescript-eslint.io/rules/no-unnecessary-type-constraint** for documentation.

Generic type parameters (`<T>`) in TypeScript may be "constrained" with an [`extends` keyword](https://www.typescriptlang.org/docs/handbook/generics.html#generic-constraints).
When no `extends` is provided, type parameters default a constraint to `any`.
It is therefore redundant to `extend` from `any`.
When no `extends` is provided, type parameters default a constraint to `unknown`.
It is therefore redundant to `extend` from `any` or `unknown`.

## Examples

Expand All @@ -19,8 +19,12 @@ It is therefore redundant to `extend` from `any`.
```ts
interface FooAny<T extends any> {}

interface FooUnknown<T extends unknown> {}

type BarAny<T extends any> = {};

type BarUnknown<T extends unknown> = {};

class BazAny<T extends any> {
quxAny<U extends any>() {}
}
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