Gulp + Tsc without wrappers

gulpfile.js

gulp.task('main', function () {
  native_tsc_task(d_src, d_out, js_out)
})

var spawn = require('child_process').spawn
function native_tsc_task(main_file, out_file, out_dir) {
  var child = spawn('tsc', [main_file, '--out', out_dir + out_file, '--target', 'es5', '--noEmitOnError', '--sourceMap'])
  var child_output = ''  
  child.stdout.on('data', function(data) { child_output += data.toString() } ) 
  child.stdout.on('end', function(data) { handle_tsc_output(main_file, child_output) }  )
}


var error_regex = new RegExp('error', 'i')
function handle_tsc_output(filename, str) {
  var title = filename
  var msg = ''
  var error = error_regex.test(str)
  if(error) {
    var strs = str.split('\n')
    title += ' Error'
    msg = strs[1]
    console.log(msg)
  }
  else {
   title += ' Success'  
   livereload()
  }
  notifier.notify({
    title: title,
    message: msg.substr(0, 281) + "..."
  })  
}