TypeScript flip n uncurry

flip.uncurry.ts

function flip<Args1 extends any[], Args2 extends any[], R>(
  fn: (...args1: Args1) => (...args2: Args2) => R
) {
  return (...args2: Args2) => (...args1: Args1) => fn(...args1)(...args2);
}

function uncurry<A, Args2 extends any[], R>(
  fn: (arg: A) => (...args2: Args2) => R
) {
  return (arg: A, ...args2: Args2) => fn(arg)(...args2);
}


const foo = <A,B>(a: A, a2: A) => (b: B): string => "hello"
const bar = flip(foo);
const baz = uncurry(bar);