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import { _isArray } from './_internals/_isArray'
export function groupWith(compareFn, list){  if (!_isArray(list)) throw new TypeError('list.reduce is not a function')
  const clone = list.slice()
  if (list.length === 1) return [ clone ]
  const toReturn = []  let holder = []
  clone.reduce((    prev, current, i  ) => {    if (i === 0) return current
    const okCompare = compareFn(prev, current)    const holderIsEmpty = holder.length === 0    const lastCall = i === list.length - 1
    if (okCompare){      if (holderIsEmpty) holder.push(prev)      holder.push(current)      if (lastCall) toReturn.push(holder)
      return current    }
    if (holderIsEmpty){      toReturn.push([ prev ])      if (lastCall) toReturn.push([ current ])
      return current    }
    toReturn.push(holder)    if (lastCall) toReturn.push([ current ])    holder = []
    return current  }, undefined)
  return toReturn}