Typesafe signal.
Methods
connect(callback:T):Void
Connects the signal to the callback.
A signal can only be connected once to a callback. It will throw an error if already connected.
To avoid this, first, use isConnected to check for existing connections.
disconnect(callback:T):Void
Disconnects the signal from the callback.
If you try to disconnect a connection that does not exist, the method will throw an error.
Use isConnected to ensure that the connection exists.
emitSignal(args:Rest<Any>):Void
Emit the signal.
The arguments type and number are checked at compile time.
isConnected(callback:T):Bool
Returns true if a connection exists between this signal and the callback.