php-web-maker/gulpfile.js

var gulp = require('gulp');
// var uglify = require('gulp-uglify');
// var minifyCSS = require('gulp-csso');
var useref = require('gulp-useref');

gulp.task('css', function(){
  return gulp.src([
    'src/lib/codemirror/lib/codemirror.css',
    'src/lib/codemirror/addon/hint/show-hint.css',
     'src/lib/codemirror/addon/fold/foldgutter.css',
     'src/lib/hint.min.css',
     'src/lib/inlet.css',
     'src/style.css',
   ])
    .pipe(concat('build.css'))
    .pipe(minifyCSS())
    .pipe(gulp.dest('src'))
});

gulp.task('useRef', [],function() {
  return gulp.src('src/index.html')
      .pipe(useref())
      .pipe(gulp.dest('dist'));
});

gulp.task('generate-service-worker', [ 'useRef' ], function(callback) {
  var swPrecache = require('sw-precache');
  var rootDir = 'dist';

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

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