The size of generated JavaScript by dart2js

include a basic web app and two basic hello demo, also include minify version.
Basic web app : 195KB, 6060 lines; minified version: 89KB, 2771 lines.
print('hello') : 2.7KB, 85 lines.
window.alert('hello') : 34KB, 1187 lines; minified version: 17KB, 535 lines.