noEmptyTypeParameters

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TypeScript and TSX

Summary

Rule available since: v1.5.0
Diagnostic Category: lint/complexity/noEmptyTypeParameters
This rule is recommended, which means is enabled by default.
This rule doesn’t have a fix.
The default severity of this rule is warning.

How to configure

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{
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  "linter": {
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    "rules": {
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      "complexity": {
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        "noEmptyTypeParameters": "error"
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      }
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    }
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  }
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}

Description

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

Invalid

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interface 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.

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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

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interface Foo {}

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type Foo<T> = {
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 bar: T;
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}