gulpfile.js

var SRC = './src';
var DST = './dist';

var gulp = require('gulp');
var browserSync = require('browser-sync');
var usemin = require('gulp-usemin');
var uglify = require('gulp-uglify');
var minifyHtml = require('gulp-minify-html');
var minifyCss = require('gulp-minify-css');
var rev = require('gulp-rev');
var stripDebug = require('gulp-strip-debug');
var clean = require('gulp-clean');
var jshint = require('gulp-jshint');

gulp.task('connect', function() {
  browserSync({server: DST});
  browserSync.watch([
    SRC + '/**/*.js',
    SRC + '/*.html',
    SRC + '/assets/**/*',
    SRC + '/levels/**/*'
  ]).on('change', function() {
    gulp.start('usemin', browserSync.reload);
  });
});

gulp.task('jslint', function() {
  return gulp.src(SRC + '/**/*.js')
    .pipe(jshint({
      lastsemic: true
    }))
    .pipe(jshint.reporter('default'))
    .pipe(jshint.reporter('fail'));
});

gulp.task('clean', ['jslint'], function() {
  return gulp.src(DST, {read: false}).pipe(clean({force: true}));
});

gulp.task('copy', ['clean'], function() {
  return gulp.src([
    SRC + '/levels/*.json',
    SRC + '/assets/*.*'
  ], {base: SRC}).pipe(gulp.dest(DST));
});

gulp.task('usemin', ['copy'], function() {
  return gulp.src(SRC + '/index.html').pipe(usemin()).pipe(gulp.dest(DST));
});

gulp.task('useminAll', ['copy'], function() {
  return gulp.src(SRC + '/index.html').pipe(usemin({
    js: [uglify({
      preserveComments: true
    }), rev()],
    css: [minifyCss(), rev()],
    html: [minifyHtml()]
  })).pipe(gulp.dest(DST));
});

gulp.task('stripDebug', ['useminAll'], function() {
  return gulp.src(DST + '/game*.js').pipe(stripDebug()).pipe(gulp.dest(DST));
});


gulp.task('default', ['usemin', 'connect']);
gulp.task('dist', ['stripDebug']);