composeAsync

composeAsync.js

const composeAsync = (...fs) => {
  if (fs.length === 0) {
    throw new Error('compose requires at least one argument')
  }

  return async (...as) => {
    const call = async fs => {
      const f = fs[0]
      const tail = fs.slice(1, Infinity)
      return await tail.length === 0 ? f(...as) : f(await call(tail))
    }
    return await call(fs)
  }
}

Function composition with for asynchronous functions.

Test: https://repl.it/HT3C/4