watchify gulp

watch-scripts.task.js

gulp.task('watch-scripts', function() {
  var watchify = require('watchify')
  var util = require('gulp-util')
  var source = require('vinyl-source-stream')

  var watcher = watchify('./src/index.js')

  var bundle = function() {
    return watcher
      .bundle({debug: true})
      .on('error', util.log)
      .pipe(source('client.js'))
      .pipe(gulp.test('./build'))
  }

  watcher.on('update', bundle)

  return bundle()
})