feat(build): add tasks to watch and recompile js and dart

Author: vsavkin

gulpfile.js

@@ -511,6 +511,10 @@ gulp.task('test.unit.js', ['build.js.dev'], function (done) {
  );
 });
 
+gulp.task('watch.js.dev', ['build.js.dev'], function (done) {
+ watch('modules/**', ['!broccoli.js.dev']);
+});
+
 gulp.task('test.unit.js.sauce', ['build.js.dev'], function (done) {
  var browserConf = getBrowsersFromCLI();
  if (browserConf.isSauce) {
@@ -597,6 +601,29 @@ gulp.task('test.unit.dart', function (done) {
  );
 });
 
+gulp.task('watch.dart.dev', function (done) {
+ runSequence(
+ 'build/tree.dart',
+ 'build/pure-packages.dart',
+ '!build/pubget.angular2.dart',
+ '!build/change_detect.dart',
+ '!build/remove-pub-symlinks',
+ 'build.dart.material.css',
+ function(error) {
+ // if initial build failed (likely due to build or formatting step) then exit
+ // otherwise karma server doesn't start and we can't continue running properly
+ if (error) {
+ done(error);
+ return;
+ }
+
+ watch(['modules/angular2/**'], { ignoreInitial: true }, [
+ '!build/tree.dart'
+ ]);
+ }
+ );
+});
+
 gulp.task('!test.unit.dart/karma-run', function (done) {
  // run the run command in a new process to avoid duplicate logging by both server and runner from
  // a single process