Harbs opened a new issue #207:
URL: https://github.com/apache/royale-compiler/issues/207
Currently in ActionScript, it's only possible to declare function signatures
for methods and package level functions. It's not possible to declare
signatures for variables and function paramters. The best you have is `var
foo:Function` or `function foo(fun:Function):Function{}`.
This in my opinion is the biggest hole in the ActionScript type system. I
have felt this lack for a very long time. It's very commonly felt in event
handlers, but possibly a bigger issue is that it makes ActionScript a poor
choice for functional-style programming.
If I had only one feature I could add to the language, it would be typed
functions with signatures.
The exact syntax is less important than the type safety. My initial
suggestion would be Vector style angle brackets with content like you'd use for
an interface. Something like this: `var fun:Function.<(ev:Event):void>` or
`function foo(callback:Function.<(handler:IAsyncTask):IAsyncTask>):void{}`.
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