Available on js
@:value(cast "closed")@:enum@:implinlineread onlyCLOSED:DataChannelState = "closed"
@:value(cast "closing")@:enum@:implinlineread onlyCLOSING:DataChannelState = "closing"
@:value(cast "connecting")@:enum@:implinlineread onlyCONNECTING:DataChannelState = "connecting"
@:value(cast "open")@:enum@:implinlineread onlyOPEN:DataChannelState = "open"