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adjacent-overload-signatures

Require that function overload signatures be consecutive.

✅

Extending "plugin:@typescript-eslint/recommended" in an ESLint configuration enables this rule.

Function overload signatures represent multiple ways a function can be called, potentially with different return types. It's typical for an interface or type alias describing a function to place all overload signatures next to each other. If Signatures placed elsewhere in the type are easier to be missed by future developers reading the code.

.eslintrc.cjs
module.exports = {
  "rules": {
    "@typescript-eslint/adjacent-overload-signatures": "error"
  }
};

Examples​

declare namespace Foo {
  export function foo(s: string): void;
  export function foo(n: number): void;
  export function bar(): void;
  export function foo(sn: string | number): void;
}

type Foo = {
  foo(s: string): void;
  foo(n: number): void;
  bar(): void;
  foo(sn: string | number): void;
};

interface Foo {
  foo(s: string): void;
  foo(n: number): void;
  bar(): void;
  foo(sn: string | number): void;
}

class Foo {
  foo(s: string): void;
  foo(n: number): void;
  bar(): void {}
  foo(sn: string | number): void {}
}

export function foo(s: string): void;
export function foo(n: number): void;
export function bar(): void;
export function foo(sn: string | number): void;

Options​

This rule is not configurable.

When Not To Use It​

If you don't care about the general structure of the code, then you will not need this rule.

Resources​