Overloaded signatures which are not next to each other can lead to code which is hard to read and maintain.

Invalid:

(bar is declared in-between foo overloads)

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

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

class FooClass {
  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 {}

Valid:

(bar is declared after foo)

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

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

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

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