typescript/adjacent-overload-signatures Style

What it does

Require that function overload signatures be consecutive.

Why is this bad?

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.

Example

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;

References

• Rule Source