Gulpfile for R.O.A.S. service worker

gulpfile.js

var gulp = require('gulp');
var swPrecache = require('sw-precache');

gulp.task('generate-service-worker', function(callback) {
    var rootDir = 'app';

    swPrecache.write(`${rootDir}/service-worker.js`, {
        staticFileGlobs: ['app/**/*.{js,html,css,png,jpg,gif,svg,eot,ttf,woff,woff2,mp3,json}'],
        maximumFileSizeToCacheInBytes: ['52428800']
    }, callback);
});

gulp.task( 'default', [ 'generate-service-worker' ] );