@netlify/zip-it-and-ship-it/src/node.js

Zip it and ship it

const { stat } = require('fs')
const { dirname, normalize, sep } = require('path')
const { promisify } = require('util')

const commonPathPrefix = require('common-path-prefix')
const unixify = require('unixify')

const { startZip, addZipFile, addZipContent, endZip } = require('./archive')

const pStat = promisify(stat)

// Zip a Node.js function file
const zipNodeJs = async function(srcFiles, destPath, filename, mainFile) {
  const { archive, output } = startZip(destPath)

  const dirnames = srcFiles.map(dirname)
  const commonPrefix = commonPathPrefix(dirnames)

  addEntryFile(commonPrefix, archive, filename, mainFile)

  const srcFilesInfos = await Promise.all(srcFiles.map(addStat))

  // We ensure this is not async, so that the archive's checksum is
  // deterministic. Otherwise it depends on the order the files were added.
  srcFilesInfos.forEach(({ srcFile, stat }) => {
    zipJsFile({ srcFile, commonPrefix, archive, stat })
  })

  await endZip(archive, output)
}

const addEntryFile = function(commonPrefix, archive, filename, mainFile) {
  const mainPath = normalizeFilePath(mainFile, commonPrefix)
  const content = Buffer.from(`module.exports = require('./${mainPath}')`)
  const entryFilename = filename.endsWith('.js') ? filename : `${filename}.js`

  addZipContent(archive, content, entryFilename)
}

const addStat = async function(srcFile) {
  const stat = await pStat(srcFile)
  return { srcFile, stat }
}

const zipJsFile = function({ srcFile, commonPrefix, archive, stat }) {
  const filename = normalizeFilePath(srcFile, commonPrefix)
  addZipFile(archive, srcFile, filename, stat)
}

// `adm-zip` and `require()` expect Unix paths.
// We remove the common path prefix.
// With files on different Windows drives, we remove the drive letter.
const normalizeFilePath = function(path, commonPrefix) {
  const pathA = normalize(path)
  const pathB = pathA.replace(commonPrefix, `${ZIP_ROOT_DIR}${sep}`)
  const pathC = unixify(pathB)
  return pathC
}

const ZIP_ROOT_DIR = 'src'

module.exports = { zipNodeJs }