Fix type annotations in emitter
Fix type annotations in emitter

srawlins/streamy-dart,google/streamy-dart,srawlins/streamy-dart,srawlins/streamy-dart,ronlobo/streamy-dart,ronlobo/streamy-dart,google/streamy-dart,google/streamy-dart,ronlobo/streamy-dart,srawlins/streamy-dart,google/streamy-dart,ronlobo/streamy-dart