workbox-build-inject.js

const {injectManifest} = require('workbox-build')

// We reuse the configuration from Workbox CLI
var workboxConfig = require('./workbox-config.js')

// Adding one extra property
workboxConfig.swSrc = 'src/sw-default.js'

// Deleting unneeded property
delete workboxConfig.runtimeCaching

injectManifest(workboxConfig)
  .then(({count, size}) => {
    console.log(`Generated ${workboxConfig.swDest}, which will precache ${count} files, totaling ${size} bytes.`)
  })