gulpfile.js

var gulp = require('gulp'),
  uglify = require('gulp-uglify'),
  rimraf = require('gulp-rimraf'),
  rename = require('gulp-rename'),
  gutil = require('gulp-util'),
  tap = require('gulp-tap'),
  buffer = require('gulp-buffer'),
  sourcemaps = require('gulp-sourcemaps'),
  browserify = require('browserify'),
  reactify = require('reactify'),
  mochify = require('mochify'),
  mocha = require('gulp-mocha'),
  SRC = './lib/SmartString.js',
  TEST_SRC = './test/SmartString.test.js',
  DEST = 'dist',
  SRC_COMPILED = 'SmartString.js',
  MIN_FILE = 'SmartString.min.js'

gulp.task('browserify', function () {
  return gulp.src(SRC, { read: false }) // no need of reading file because browserify does.

    // transform file objects using gulp-tap plugin
    .pipe(tap(function (file) {
      gutil.log('bundling ' + file.path)

      // replace file contents with browserify's bundle stream
      file.contents = browserify(file.path, { debug: true }).bundle()
    }))

    // transform streaming contents into buffer contents (because gulp-sourcemaps does not support streaming contents)
    .pipe(buffer())

    // load and init sourcemaps
    .pipe(sourcemaps.init({ loadMaps: true }))

    .pipe(uglify())

    // write sourcemaps
    .pipe(sourcemaps.write('./'))

    .pipe(gulp.dest('dist'))
})

/*
// gulp-browserify is deprecated
gulp.task('browserify', function() {
    return gulp.src(SRC)
        .pipe(browserify({
            detectGlobals: true,
            standalone: 'S'
        }))
        .pipe(gulp.dest(DEST))
})
*/
gulp.task('test', function () {
  return gulp.src(TEST_SRC, { read: false })
    .pipe(mocha({ reporter: 'spec', growl: 1 }))
})

gulp.task('clean', function () {
  return gulp.src(DEST)
    .pipe(rimraf())
})

gulp.task('build', ['test', 'clean', 'browserify'], function () {
  gulp.src(DEST + '/' + SRC_COMPILED)
    .pipe(uglify())
    .pipe(rename(MIN_FILE))
    .pipe(gulp.dest(DEST))
})

gulp.task('browserTest', function (done) {
  return mochify({ wd: true })
    .on('error', function (err) {
      if (err) done(err)
      else done()
    })
    .bundle()
})


// snippet 
gulp.task('log', function() {
    // content
    console.log('just a placeholder');
});

// The default task (called when you run `gulp` from cli)
gulp.task('default', ['clean', 'build'])