noEmptyTypeParameters
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Diagnostic Category: lint/complexity/noEmptyTypeParameters
Since: v1.5.0
Disallow empty type parameters in type aliases and interfaces.
TypeScript permits the use of empty type parameter lists in type alias and interface declarations; however, this practice is generally discouraged. Allowing empty type parameter lists can lead to unclear or ambiguous code, where the intention of the generic type is not self-evident. This rule disallows empty type parameter lists in type alias and interface declarations.
Examples
Section titled ExamplesInvalid
Section titled Invalidinterface Foo<> {}code-block.ts:1:14 lint/complexity/noEmptyTypeParameters ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✖ Using an empty type parameter list is confusing.
> 1 │ interface Foo<> {}
│ ^^
2 │
ℹ Remove the empty type parameter list or add a type parameter.
type Bar<> = {};code-block.ts:1:9 lint/complexity/noEmptyTypeParameters ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✖ Using an empty type parameter list is confusing.
> 1 │ type Bar<> = {};
│ ^^
2 │
ℹ Remove the empty type parameter list or add a type parameter.
Valid
Section titled Validinterface Foo {}type Foo<T> = { bar: T;}