Create AppCache based on parameters from sw-precache

appcache-precache.js

const SW_PRECACHE_CONFIG = './sw-precache-config'
const OUT_FILE = 'build/precache.appcache'

const glob = require('globby')
const { staticFileGlobs, stripPrefix } = require(SW_PRECACHE_CONFIG)
const fs = require('fs')
const path = require('path')

glob(staticFileGlobs).then(files => {
  // filter out directories
  files = files.filter(file => fs.statSync(file).isFile())

  // strip out prefix
  files = files.map(file => file.replace(stripPrefix, ''))

  // add the header and join to string
  const out = ['CACHE MANIFEST', ...files].join('\n')

  // write the file
  fs.writeFileSync(path.join(__dirname, OUT_FILE), out)

  // we're done!
  console.log(`Wrote ${OUT_FILE} with ${files.length} resources.`)
})