recursively add specific files within a directory to a zipfile using NodeJS & JsZip

generate-zip-from-files.js

const fs = require('fs')
const path = require('path')
const JSZip = require('jszip')
const { promisify } = require('util')
const readFile = promisify(fs.readFile)
const readDir = promisify(fs.readdir)
const lstat = promisify(fs.lstat)

function addFilesToZip (jsZip, directoryPath, filesToInclude) {
  const promiseArr = filesToInclude.map(async file => {
    const filePath = path.join(directoryPath, file)
    try {
      const fileStats = await lstat(filePath)
      const isDirectory = fileStats.isDirectory()
      if (isDirectory) {
        const directory = jsZip.folder(file)
        const subFiles = await readDir(filePath)
        return addFilesToZip(directory, filePath, subFiles)
      } else {
        const fileContent = await readFile(filePath)
        return jsZip.file(file, fileContent)
      }
    } catch (err) {
      // console.log(err)
      return Promise.resolve()
    }
  })
  return Promise.all(promiseArr)
}

async function createZipFromFiles (directoryPaths, filesToInclude, dontCreateTopLevelFolder = false) {
  const jsZip = new JSZip()
  await Promise.all(
    directoryPaths.map(directoryPath => {
      const parsed = path.parse(directoryPath)
      const folder = dontCreateTopLevelFolder ? jsZip : jsZip.folder(parsed.base)
      return addFilesToZip(folder, directoryPath, filesToInclude)
    })
  )
  return jsZip
}

module.exports.generateZipFromFiles = function generateZipFromFiles (directoryPaths, filesToInclude, outputPath) {
  return new Promise(async (resolve, reject) => {
    const jsZip = await createZipFromFiles(directoryPaths, filesToInclude, true)
    jsZip.generateNodeStream({ type: 'nodebuffer', streamFiles: true })
      .pipe(fs.createWriteStream(outputPath))
      .on('finish', () => {
        console.log(`${outputPath} written.`)
        resolve(outputPath)
      })
  })
}