declare namespace NSFoo2 {
  export function foo(s: string): void
  export function foo(n: number): void
  export function foo(sn: string | number): void
  export function bar(): void
}

type TypeFoo2 = {
  foo(s: string): void
  foo(n: number): void
  foo(sn: string | number): void
  bar(): void
}

interface IFoo2 {
  foo(s: string): void
  foo(n: number): void
  foo(sn: string | number): void
  bar(): void
}