site/workbox-config.js

module.exports = {
  globDirectory: 'dist/',
  globPatterns: [
    '**/*.{png,css,ico,svg,ttf,woff,woff2,js,json}',
    'index.html'
  ],
  swSrc: 'src/js/sw.js',
  swDest: 'dist/sw.js',
  mode: 'production'
}