Flow curry3

curry3.js

//@flow

declare export function curry3<A, B, C, D>(fn: (a: A, b: B, c: C) => D): (
  & ((a: A, nob: void, noc: void) => (
    & ((b: B, noc: void) => ((c: C) => D))
    & ((b: B, c: C) => D)
  ))
  & ((a: A, b: B, noc: void) => ((c: C) => D))
  & ((a: A, b: B, c: C) => D)
)

// EXAMPLE:

declare function sum(a: number, b: number, c: number): number

const sum10 = sumCurry(10)
const sum10_9 = sum10(9)
const res = sum10(11, 12)

//Must fail

//const sum10err = sumCurry('10')
//const wrongCurry = sum10(11)(12, 14)