Can Corey Haines figure out how to write the `block` function? (probablah nah)

lambda-calculus-challenge.js

// EXPLANATION / CHALLENGE: https://vimeo.com/492391391

// The program in JavaScript: `for(let i=10; i; --i) console.log(i)`
// But THIS!! is the program in "lambda calculus JavaScript"!!!!

// Functoins that begin with a dollar sign cheat and use JS stuff
const $DIE = arg => { throw new Error("should not call!") }

// The rest of these cheat by assigning to constants instead of passing into variables,
// but none of them are self refferential, so that's just to make it easier to read
const id  = x => x
const y = f =>
  (recur => x => f(recur(recur))(x))
  (recur => x => f(recur(recur))(x))

const cons   = l => r => f => f(l)(r)
const car    = list => list(l => r => l)
const cdr    = list => list(l => r => r)

const TRUE   = trueVal => falseVal => trueVal
const FALSE  = trueVal => falseVal => falseVal
const IF     = bool => trueCase => falseCase => bool(trueCase)(falseCase)($DIE)
const noop = id

const inc  = n => f => x => n(f)(f(x))
const n0  = f => x => x
const n1  = inc(n0)
const n2  = inc(n1)
const n3  = inc(n2)
const n4  = inc(n3)
const n5  = inc(n4)
const n6  = inc(n5)
const n7  = inc(n6)
const n8  = inc(n7)
const n9  = inc(n8)
const n10 = inc(n9)
const isZero = n => n(bool => FALSE)(TRUE)
const dec    = n =>
    cdr(
      n(args =>
        IF(car(args))
          (_ => cons(FALSE)(cdr(args)))
          (_ => cons(FALSE)(inc(cdr(args))))
      )(cons(TRUE)(n0))
    )

// !!!!!HERE is the function that eluded me for hours!!!!!
// Can you figure out its definition?
const block = () => { throw "FIX ME, COREY HAINES, I LOVE YOU!! I NEED YOU!!" }

// // Here are some test cases that I wrote:
// console.log(block(n0)(3))                                 // => 3
// console.log(block(n1)(x => x*10)(3))                      // => 30
// console.log(block(n2)(x => x*10)(x => x+5)(3))            // => 35
// console.log(block(n3)(x => x*10)(x => x+5)(x => x*2)(3))  // => 70

const $toJs  = n => n(i => i+1)(0)
const $print = n => console.log($toJs(n))
const $wait  = f => seconds => setTimeout(f, $toJs(seconds)*1000)
const countdown = y(recur =>
  n =>
    IF(isZero(n))
      (noop)
      (block(n2)
        (_ => $print(n))
        (_ => $wait(_ => recur(dec(n)))(n1))
      )
)
countdown(n10)