[Typescript] 56. Medium - Flip Arguments

Implement the type version of lodash's _.flip.

Type FlipArguments<T> requires function type T and returns a new function type which has the same return type of T but reversed parameters.

For example:

type Flipped = FlipArguments<(arg0: string, arg1: number, arg2: boolean) => void> 
// (arg0: boolean, arg1: number, arg2: string) => void

 

/* _____________ Your Code Here _____________ */

type Reverse<T extends any[]> = T extends [...infer A, infer B] ? [B, ...Reverse<A>] : []
type FlipArguments<T extends (...arg: any[]) => any> = T extends (...args: infer Args) => infer RT ? (...r: Reverse<Args>) => RT : never;

/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<FlipArguments<() => boolean>, () => boolean>>,
  Expect<Equal<FlipArguments<(foo: string) => number>, (foo: string) => number>>,
  Expect<Equal<FlipArguments<(arg0: string, arg1: number, arg2: boolean) => void>, (arg0: boolean, arg1: number, arg2: string) => void>>,
]

type errors = [
  // @ts-expect-error
  FlipArguments<'string'>,
  // @ts-expect-error
  FlipArguments<{ key: 'value' }>,
  // @ts-expect-error
  FlipArguments<['apple', 'banana', 100, { a: 1 }]>,
  // @ts-expect-error
  FlipArguments<null | undefined>,
]