gulpfile.js

// ===========
// This file was based on another source. Updates have been made but the original can be found below.
//
// original: https://gist.github.com/Sigmus/9253068 
// ===========
var path = require('path');
var source = require('vinyl-source-stream');
var gulp = require('gulp');
var gutil = require('gulp-util');
var browserify = require('browserify');
var watchify = require('watchify');
var notify = require("gulp-notify");
var uglify = require("gulp-uglify");
var streamify = require("gulp-streamify");

function handleErrors() {
  var args = Array.prototype.slice.call(arguments);
  
  notify.onError({
        title: "Compile Error",
        message: "<%= error.message %>"
      })
      .apply(this, args);

  this.emit('end'); // Keep gulp from hanging on this task
}


function buildScript(filePath, watch) {
    var details = path.parse(filePath);
    var outFile = details.name + '.bundle' + details.ext;
    var outDir = details.dir;

    var props = { entries: [filePath], debug: true, cache: {}, packageCache: {}, paths: ['./'] };
    var bundler = browserify(props);

    function rebundle() {
        return bundler
            .bundle()
            .on('error', handleErrors)
            .pipe(source(outFile))
            .pipe(streamify(uglify()))
            .pipe(gulp.dest(outDir));
    }

    if (watch) {
        bundler = watchify(bundler);
        
        bundler.on('update', function () {
            rebundle();
            gutil.log('Rebundle...');
        });
    }


  return rebundle();
}

function buildTests(watch) {
    return buildScript('./tests/graphical/scripts/main.js', watch);
}


gulp.task('build-tests', function() {
    return buildTests(false);
});

gulp.task('watch-tests', function() {
    return buildTests(true);
});


gulp.task('default', ['watch-tests']);