How to use the flying-squid.generations function in flying-squid

const spiralloop = require('spiralloop')

const generations = require('flying-squid').generations
const { promisify } = require('util')
const fs = require('fs')
const { level } = require('prismarine-provider-anvil')

const fsStat = promisify(fs.stat)
const fsMkdir = promisify(fs.mkdir)

module.exports.server = async function (serv, { version, worldFolder, generation = { 'name': 'diamond_square', 'options': { 'worldHeight': 80 } } } = {}) {
  const World = require('prismarine-world')(version)

  const newSeed = generation.options.seed || Math.floor(Math.random() * Math.pow(2, 31))
  let seed
  let regionFolder
  if (worldFolder) {
    regionFolder = worldFolder + '/region'
    try {